Als Beitrag zur Entwicklung zukünftiger sparsamerer Gasturbinen werden in unserem Labor Stabilisations- und Verlöschmechanismen in turbulenten Flammen untersucht. Die Interaktion zwischen der Strömung und der chemischen Reaktion soll dazu unter realen Bedingungen erforscht werden. Unsere Daten werden dazu verwendet, um anschließend numerische Modelle zu verbessern und Testbrenner für Gasturbinen zu entwickeln. Mehr hierzu...
Die Speicherung erneuerbarer Energie ist ein zentrales Thema der Energiewende. In Zusammenarbeit mit der TU Darmstadt erforschen wir Eisen als Energieträger. Reduktion speichert Energie, Verbrennung setzt sie frei. Einflussfaktoren wie Partikeleigenschaften und Umgebungsbedingungen werden mit Laserdiagnostik und Simulationsansätzen untersucht und modelliert. Mehr hierzu...
Die Raman-Spektroskopie ermöglicht es, durch Licht-Materie-Interaktion chemische Prozesse zu analysieren, ohne diese zu beeinflussen. Allerdings ist die Signalintensität äußerst niedrig und wird von Hintergründen, wie Fluoreszenz oder Wärmestrahlung überlagert. In diesem Projekt wird erforscht, ob mit der Raman-Technik SERDS auch in herausfordernden Bedingungen präzise quantitative Messungen durchgeführt werden können. Mehr hierzu...
Die Chemieindustrie zählt zu den energieintensivsten Sektoren und ist stark von fossilen Rohstoffen abhängig. Ein wichtiger Schritt zur nachhaltigen Transformation ist die Entwicklung umweltfreundlicher Prozesse, die erneuerbare Rohstoffe und wirtschaftliche Katalysatoren nutzen. Mit einem Raman-Spektrometer und IR-Thermografie analysieren wir Gaskonzentrationen, Temperaturen und Prozessbedingungen, ergänzt durch CFD-Simulationen. Mehr hierzu...
Ammoniak (NH3) ist ein kohlenstofffreier Energieträger mit Vorteilen bei Transport und Lagerung gegenüber Wasserstoff. Wasserstoff wird jedoch als Additiv genutzt, um die Verbrennung zu beschleunigen, wobei partielles Cracking NH3 in H2 und N2 spaltet. Ziel unserer Forschung ist es, quantitative Daten zur Ammoniak-Verbrennung zu generieren und die Bildung von Stickoxiden besser zu verstehen. Mehr hierzu...
Die Mischgeschwindigkeit ist ein zentraler Faktor chemischer Verfahren und beeinflusst Produktausbeute und Abfallmenge. Besonders bei schnellen Reaktionen sind Mikrovermischungen vorteilhaft, da sie Vermischungen deutlich schneller als herkömmliche Techniken ermöglichen. Mikroinjektion injiziert Flüssigkeiten in eine turbulente Mischzone, wobei kleine Wirbel die Vermischungsgeschwindigkeit erhöhen. Mehr hierzu...
Die Raman-Spektroskopie detektiert Spezies und Temperaturen zeit- und ortsaufgelöst und ist ein wichtiges Werkzeug zur Analyse zum Beispiel von Verbrennungsprozessen regenerativer Kraftstoffe. Quantenmechanische Simulationen sind notwendig, um die Spektren zu quantifizieren und deren Form sowie Temperatur- und Druckabhängigkeit zu verstehen. Mehr hierzu...
Die Raman-Spektroskopie misst Stoffkonzentrationen in Strömungen, da jede Molekülspezies ein einzigartiges Spektrum besitzt. Die Spektren überlagern sich jedoch, was die Auswertung bei schwachen Signalen erschwert. Ziel des Projekts ist die Weiterentwicklung der Auswertetechnik mithilfe experimenteller Daten und maschinellem Lernen, um die Methode robuster zu machen. Mehr hierzu...
Trabold, Johannes; Butz, David; Schneider, Silvan; Dieter, Kevin; Barlow, Robert; Dreizler, Andreas; Geyer, Dirk
Fast shutter line-imaging system for dual-dispersion Raman spectroscopy in ethanol and OME flames Artikel
In: Combustion and Flame, Bd. 243, S. 111864, 2022.
@article{Trabold.2022,
title = {Fast shutter line-imaging system for dual-dispersion Raman spectroscopy in ethanol and OME flames},
author = {Johannes Trabold and David Butz and Silvan Schneider and Kevin Dieter and Robert Barlow and Andreas Dreizler and Dirk Geyer},
url = {https://www.sciencedirect.com/science/article/pii/S0010218021006076},
doi = {10.1016/j.combustflame.2021.111864},
year = {2022},
date = {2022-01-01},
journal = {Combustion and Flame},
volume = {243},
pages = {111864},
abstract = {Chemical energy carriers synthesized from renewable energy sources such as ethanol or oxymethylene ethers (OME) will become increasingly important for CO2<math><msub is=textquotedbltruetextquotedbl><mrow is=textquotedbltruetextquotedbl></mrow><mn is=textquotedbltruetextquotedbl>2</mn></msub></math>-neutral thermochemical energy conversion processes. Therefore, it is important to make these processes efficient and clean. This needs more predictive numerical simulation tools and an improved understanding of the combustion process. For this purpose, spatially resolved measurements of local thermochemical states in reaction zones are required, for which combined Raman- and Rayleigh spectroscopy is suitable. Since a large number of intermediate hydrocarbons occur in the reaction zones of ethanol and OME flames, Raman spectroscopy must be evolved for quantitative measurement of these species over a wide temperature range. Against this background, this study pursues the goal of creating the instrumental and apparatus-related pre-requisites. The setup of a new dual-dispersion spectrometer and its main specifications are presented. The usability of the spectrometer is demonstrated on the example of premixed and partially-premixed ethanol/air and OME-3/air flames. For this purpose, a new counterflow burner is presented, which enables laminar, single-phase combustion processes of pre-vaporized fuels.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, D.; Breicher, A.; Barlow, R. S.; Geyer, D.; Dreizler, A.
In: Combustion and Flame, Nr. 09, S. 111941, 2022.
@article{Butz.2022,
title = {Turbulent multi-regime methane-air flames analysed by Raman/Rayleigh spectroscopy and conditional velocity field measurements},
author = {D. Butz and A. Breicher and R. S. Barlow and D. Geyer and A. Dreizler},
doi = {10.1016/j.combustflame.2021.111941},
year = {2022},
date = {2022-01-01},
journal = {Combustion and Flame},
number = {09},
pages = {111941},
abstract = {Combustion and Flame, Corrected proof, 111941. doi:10.1016/j.combustflame.2021.111941},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dieter, K.; Koschnick, K.; Lill, J.; Magnotti, G.; Weinmann, A.; Dreizler, A.; Geyer, D.
In: Journal of Quantitative Spectroscopy and Radiative Transfer, Bd. 277, S. 107978, 2022.
@article{Dieter.2022,
title = {Development of a Raman spectrometer for the characterization of gaseous hydrocarbons at high temperatures},
author = {K. Dieter and K. Koschnick and J. Lill and G. Magnotti and A. Weinmann and A. Dreizler and D. Geyer},
doi = {10.1016/j.jqsrt.2021.107978},
year = {2022},
date = {2022-01-01},
journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
volume = {277},
pages = {107978},
abstract = {Journal of Quantitative Spectroscopy and Radiative Transfer, 277 (2022) 107978. doi:10.1016/j.jqsrt.2021.107978},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paudel, Shakun; Weber, Martin; Geyer, Dirk; Saenger, Nicole
Experimental and numerical study of Zuppinger water wheel model Artikel
In: Proceedings of the Institution of Civil Engineers - Water Management, Bd. 175, Nr. 4, S. 206–216, 2022, ISSN: 1741-7589.
@article{Paudel.2022,
title = {Experimental and numerical study of Zuppinger water wheel model},
author = {Shakun Paudel and Martin Weber and Dirk Geyer and Nicole Saenger},
doi = {10.1680/jwama.20.00056},
issn = {1741-7589},
year = {2022},
date = {2022-01-01},
journal = {Proceedings of the Institution of Civil Engineers - Water Management},
volume = {175},
number = {4},
pages = {206–216},
abstract = {Proceedings of the Institution of Civil Engineers - Water Management 2022.175:206-216},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Trabold, J.; Hartl, S.; Walther, S.; Johchi, A.; Dreizler, A.; Geyer, D.
Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames Artikel
In: Flow, Turbulence and Combustion, Bd. 106, Nr. 2, S. 547–573, 2021.
@article{Trabold.2021,
title = {Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames},
author = {J. Trabold and S. Hartl and S. Walther and A. Johchi and A. Dreizler and D. Geyer},
doi = {10.1007/s10494-020-00166-6},
year = {2021},
date = {2021-01-01},
journal = {Flow, Turbulence and Combustion},
volume = {106},
number = {2},
pages = {547–573},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dunn, M. J.; Macfarlane, A. R. W.; Barlow, R. S.; Geyer, D.; Dieter, K.; Masri, A. R.
Spontaneous Raman–LIF–CO–OH measurements of species concentration in turbulent spray flames Artikel
In: Proceedings of the Combustion Institute, Bd. 38, Nr. 1, S. 1779–1786, 2021.
@article{Dunn.2021,
title = {Spontaneous Raman–LIF–CO–OH measurements of species concentration in turbulent spray flames},
author = {M. J. Dunn and A. R. W. Macfarlane and R. S. Barlow and D. Geyer and K. Dieter and A. R. Masri},
doi = {10.1016/j.proci.2020.07.037},
year = {2021},
date = {2021-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {38},
number = {1},
pages = {1779–1786},
abstract = {Proceedings of the Combustion Institute, Corrected proof. doi:10.1016/j.proci.2020.07.037},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Popp, Sebastian; Hartl, Sandra; Butz, David; Geyer, Dirk; Dreizler, Andreas; Vervisch, Luc; Hasse, Christian
In: Proceedings of the Combustion Institute, Bd. 38, Nr. 2, S. 2551–2558, 2021.
@article{Popp.2021,
title = {Assessing multi-regime combustion in a novel burner configuration with large eddy simulations using tabulated chemistry},
author = {Sebastian Popp and Sandra Hartl and David Butz and Dirk Geyer and Andreas Dreizler and Luc Vervisch and Christian Hasse},
doi = {10.1016/j.proci.2020.06.098},
year = {2021},
date = {2021-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {38},
number = {2},
pages = {2551–2558},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, David; Hartl, Sandra; Popp, Sebastian; Walther, Steffen; Barlow, Robert S.; Hasse, Christian; Dreizler, Andreas; Geyer, Dirk
Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics Artikel
In: Combustion and Flame, Bd. 210, S. 426–438, 2019.
@article{Butz.2019b,
title = {Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics},
author = {David Butz and Sandra Hartl and Sebastian Popp and Steffen Walther and Robert S. Barlow and Christian Hasse and Andreas Dreizler and Dirk Geyer},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {210},
pages = {426–438},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, David; Hartl, Sandra; Popp, Sebastian; Walther, Steffen; Barlow, Robert S.; Hasse, Christian; Dreizler, Andreas; Geyer, Dirk
Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics Artikel
In: Combustion and Flame, Bd. 210, S. 426–438, 2019.
@article{Butz.2019,
title = {Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics},
author = {David Butz and Sandra Hartl and Sebastian Popp and Steffen Walther and Robert S. Barlow and Christian Hasse and Andreas Dreizler and Dirk Geyer},
url = {https://www.sciencedirect.com/science/article/pii/S0010218019303967},
doi = {10.1016/j.combustflame.2019.08.032},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {210},
pages = {426–438},
abstract = {In practical applications, partial premixing of fuel and oxidizer, as well as recirculation of combustion products, result in complex combustion scenarios where multi-regime effects arise and a numerical representation of local reaction zones by purely premixed or purely non-premixed flame structures may not hold. Here, a novel burner system is introduced to investigate the fundamental characteristics of multi-regime combustion and to provide a basis for validating numerical models. This multi-regime burner (MRB) is specifically designed to produce flames with multi-regime characteristics while maintaining well-defined boundary conditions. Thermochemical data from Raman/Rayleigh/CO-LIF scattering experiments are provided for two selected operating conditions. The experimental investigation focuses on the overall flame structure by examining radial profiles of temperature and mixture fraction, as well as scatter plots of temperature, CH4, and CO versus mixture fraction. In order to assess the relative importance of different flame regimes, the gradient-free regime identification (GFRI) approach is extended to allow for an automated classification of local reaction zone structures. Classification criteria are defined, based on the ratio of local heat release rate peaks associated with premixed and non-premixed reaction zones located in close spatial proximity, and an automated process is implemented to classify 1D Raman/Rayleigh sample lines as premixed, dominantly premixed, multi-regime, dominantly non-premixed, or non-premixed flame zones. The importance of different flame zones, indicated by their population fractions, are found to evolve with downstream distance and show distinct differences between the two selected flames. Further, a prior analysis is used to test the applicability of 1D flame structure assumptions for the underlying combustion regime.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, S.; Winkle, R.; Geyer, D.; Dreizler, A.; Magnotti, G.; Hasse, C.; Barlow, R. S.
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2297–2305, 2019.
@article{Hartl.2019,
title = {Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames},
author = {S. Hartl and R. Winkle and D. Geyer and A. Dreizler and G. Magnotti and C. Hasse and R. S. Barlow},
doi = {10.1016/j.proci.2018.06.067},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2297–2305},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2297-2305. doi:10.1016/j.proci.2018.06.067},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, Sandra; Geyer, Dirk; Hasse, Christian; Zhao, Xinyu; Wang, Haiou; Barlow, Robert S.
Assessing an experimental approach for chemical explosive mode and heat release rate using DNS data Artikel
In: Combustion and Flame, Bd. 209, S. 214–224, 2019.
@article{Hartl.2019b,
title = {Assessing an experimental approach for chemical explosive mode and heat release rate using DNS data},
author = {Sandra Hartl and Dirk Geyer and Christian Hasse and Xinyu Zhao and Haiou Wang and Robert S. Barlow},
doi = {10.1016/j.combustflame.2019.07.038},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {209},
pages = {214–224},
abstract = {Combustion and Flame, 209 (2019) 214-224. doi:10.1016/j.combustflame.2019.07.038},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Schneider, Silvan; Geyer, Dirk; Magnotti, Gaetano; Dunn, Matthew J.; Barlow, Robert S.; Dreizler, Andreas
Structure of a stratified CH4 flame with H2 addition Artikel
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2307–2315, 2019.
@article{Schneider.2019,
title = {Structure of a stratified CH4 flame with H2 addition},
author = {Silvan Schneider and Dirk Geyer and Gaetano Magnotti and Matthew J. Dunn and Robert S. Barlow and Andreas Dreizler},
doi = {10.1016/j.proci.2018.06.205},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2307–2315},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2307-2315. doi:10.1016/j.proci.2018.06.205},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Straub, C.; Kronenburg, A.; Stein, O. T.; Barlow, R. S.; Geyer, D.
Modeling stratified flames with and without shear using multiple mapping conditioning Artikel
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2317–2324, 2019.
@article{Straub.2019,
title = {Modeling stratified flames with and without shear using multiple mapping conditioning},
author = {C. Straub and A. Kronenburg and O. T. Stein and R. S. Barlow and D. Geyer},
doi = {10.1016/j.proci.2018.07.033},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2317–2324},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2317-2324. doi:10.1016/j.proci.2018.07.033},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Straub, Carmen; Kronenburg, Andreas; Stein, Oliver T.; Kuenne, Guido; Janicka, Johannes; Barlow, Robert S.; Geyer, Dirk
In: Combustion and Flame, Bd. 196, S. 325–336, 2018.
@article{Straub.2018,
title = {Multiple mapping conditioning coupled with an artificially thickened flame model for turbulent premixed combustion},
author = {Carmen Straub and Andreas Kronenburg and Oliver T. Stein and Guido Kuenne and Johannes Janicka and Robert S. Barlow and Dirk Geyer},
doi = {10.1016/j.combustflame.2018.05.021},
year = {2018},
date = {2018-01-01},
journal = {Combustion and Flame},
volume = {196},
pages = {325–336},
abstract = {Combustion and Flame, 196 (2018) 325-336. doi:10.1016/j.combustflame.2018.05.021},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, Sandra; Geyer, Dirk; Dreizler, Andreas; Magnotti, Gaetano; Barlow, Robert S.; Hasse, Christian
Regime identification from Raman/Rayleigh line measurements in partially premixed flames Artikel
In: Combustion and Flame, Bd. 189, S. 126–141, 2018.
@article{Hartl.2018,
title = {Regime identification from Raman/Rayleigh line measurements in partially premixed flames},
author = {Sandra Hartl and Dirk Geyer and Andreas Dreizler and Gaetano Magnotti and Robert S. Barlow and Christian Hasse},
doi = {10.1016/j.combustflame.2017.10.024},
year = {2018},
date = {2018-01-01},
journal = {Combustion and Flame},
volume = {189},
pages = {126–141},
abstract = {Combustion and Flame, 189 (2017) 126-141. doi:10.1016/j.combustflame.2017.10.024},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Trabold, Johannes; Butz, David; Schneider, Silvan; Dieter, Kevin; Barlow, Robert; Dreizler, Andreas; Geyer, Dirk
Fast shutter line-imaging system for dual-dispersion Raman spectroscopy in ethanol and OME flames Artikel
In: Combustion and Flame, Bd. 243, S. 111864, 2022.
@article{Trabold.2022,
title = {Fast shutter line-imaging system for dual-dispersion Raman spectroscopy in ethanol and OME flames},
author = {Johannes Trabold and David Butz and Silvan Schneider and Kevin Dieter and Robert Barlow and Andreas Dreizler and Dirk Geyer},
url = {https://www.sciencedirect.com/science/article/pii/S0010218021006076},
doi = {10.1016/j.combustflame.2021.111864},
year = {2022},
date = {2022-01-01},
journal = {Combustion and Flame},
volume = {243},
pages = {111864},
abstract = {Chemical energy carriers synthesized from renewable energy sources such as ethanol or oxymethylene ethers (OME) will become increasingly important for CO2<math><msub is=textquotedbltruetextquotedbl><mrow is=textquotedbltruetextquotedbl></mrow><mn is=textquotedbltruetextquotedbl>2</mn></msub></math>-neutral thermochemical energy conversion processes. Therefore, it is important to make these processes efficient and clean. This needs more predictive numerical simulation tools and an improved understanding of the combustion process. For this purpose, spatially resolved measurements of local thermochemical states in reaction zones are required, for which combined Raman- and Rayleigh spectroscopy is suitable. Since a large number of intermediate hydrocarbons occur in the reaction zones of ethanol and OME flames, Raman spectroscopy must be evolved for quantitative measurement of these species over a wide temperature range. Against this background, this study pursues the goal of creating the instrumental and apparatus-related pre-requisites. The setup of a new dual-dispersion spectrometer and its main specifications are presented. The usability of the spectrometer is demonstrated on the example of premixed and partially-premixed ethanol/air and OME-3/air flames. For this purpose, a new counterflow burner is presented, which enables laminar, single-phase combustion processes of pre-vaporized fuels.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, D.; Breicher, A.; Barlow, R. S.; Geyer, D.; Dreizler, A.
In: Combustion and Flame, Nr. 09, S. 111941, 2022.
@article{Butz.2022,
title = {Turbulent multi-regime methane-air flames analysed by Raman/Rayleigh spectroscopy and conditional velocity field measurements},
author = {D. Butz and A. Breicher and R. S. Barlow and D. Geyer and A. Dreizler},
doi = {10.1016/j.combustflame.2021.111941},
year = {2022},
date = {2022-01-01},
journal = {Combustion and Flame},
number = {09},
pages = {111941},
abstract = {Combustion and Flame, Corrected proof, 111941. doi:10.1016/j.combustflame.2021.111941},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dieter, K.; Koschnick, K.; Lill, J.; Magnotti, G.; Weinmann, A.; Dreizler, A.; Geyer, D.
In: Journal of Quantitative Spectroscopy and Radiative Transfer, Bd. 277, S. 107978, 2022.
@article{Dieter.2022,
title = {Development of a Raman spectrometer for the characterization of gaseous hydrocarbons at high temperatures},
author = {K. Dieter and K. Koschnick and J. Lill and G. Magnotti and A. Weinmann and A. Dreizler and D. Geyer},
doi = {10.1016/j.jqsrt.2021.107978},
year = {2022},
date = {2022-01-01},
journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
volume = {277},
pages = {107978},
abstract = {Journal of Quantitative Spectroscopy and Radiative Transfer, 277 (2022) 107978. doi:10.1016/j.jqsrt.2021.107978},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paudel, Shakun; Weber, Martin; Geyer, Dirk; Saenger, Nicole
Experimental and numerical study of Zuppinger water wheel model Artikel
In: Proceedings of the Institution of Civil Engineers - Water Management, Bd. 175, Nr. 4, S. 206–216, 2022, ISSN: 1741-7589.
@article{Paudel.2022,
title = {Experimental and numerical study of Zuppinger water wheel model},
author = {Shakun Paudel and Martin Weber and Dirk Geyer and Nicole Saenger},
doi = {10.1680/jwama.20.00056},
issn = {1741-7589},
year = {2022},
date = {2022-01-01},
journal = {Proceedings of the Institution of Civil Engineers - Water Management},
volume = {175},
number = {4},
pages = {206–216},
abstract = {Proceedings of the Institution of Civil Engineers - Water Management 2022.175:206-216},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Trabold, J.; Hartl, S.; Walther, S.; Johchi, A.; Dreizler, A.; Geyer, D.
Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames Artikel
In: Flow, Turbulence and Combustion, Bd. 106, Nr. 2, S. 547–573, 2021.
@article{Trabold.2021,
title = {Fuel Effects in Turbulent Premixed Pre-vaporised Alcohol/Air Jet Flames},
author = {J. Trabold and S. Hartl and S. Walther and A. Johchi and A. Dreizler and D. Geyer},
doi = {10.1007/s10494-020-00166-6},
year = {2021},
date = {2021-01-01},
journal = {Flow, Turbulence and Combustion},
volume = {106},
number = {2},
pages = {547–573},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dunn, M. J.; Macfarlane, A. R. W.; Barlow, R. S.; Geyer, D.; Dieter, K.; Masri, A. R.
Spontaneous Raman–LIF–CO–OH measurements of species concentration in turbulent spray flames Artikel
In: Proceedings of the Combustion Institute, Bd. 38, Nr. 1, S. 1779–1786, 2021.
@article{Dunn.2021,
title = {Spontaneous Raman–LIF–CO–OH measurements of species concentration in turbulent spray flames},
author = {M. J. Dunn and A. R. W. Macfarlane and R. S. Barlow and D. Geyer and K. Dieter and A. R. Masri},
doi = {10.1016/j.proci.2020.07.037},
year = {2021},
date = {2021-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {38},
number = {1},
pages = {1779–1786},
abstract = {Proceedings of the Combustion Institute, Corrected proof. doi:10.1016/j.proci.2020.07.037},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Popp, Sebastian; Hartl, Sandra; Butz, David; Geyer, Dirk; Dreizler, Andreas; Vervisch, Luc; Hasse, Christian
In: Proceedings of the Combustion Institute, Bd. 38, Nr. 2, S. 2551–2558, 2021.
@article{Popp.2021,
title = {Assessing multi-regime combustion in a novel burner configuration with large eddy simulations using tabulated chemistry},
author = {Sebastian Popp and Sandra Hartl and David Butz and Dirk Geyer and Andreas Dreizler and Luc Vervisch and Christian Hasse},
doi = {10.1016/j.proci.2020.06.098},
year = {2021},
date = {2021-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {38},
number = {2},
pages = {2551–2558},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, David; Hartl, Sandra; Popp, Sebastian; Walther, Steffen; Barlow, Robert S.; Hasse, Christian; Dreizler, Andreas; Geyer, Dirk
Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics Artikel
In: Combustion and Flame, Bd. 210, S. 426–438, 2019.
@article{Butz.2019b,
title = {Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics},
author = {David Butz and Sandra Hartl and Sebastian Popp and Steffen Walther and Robert S. Barlow and Christian Hasse and Andreas Dreizler and Dirk Geyer},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {210},
pages = {426–438},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Butz, David; Hartl, Sandra; Popp, Sebastian; Walther, Steffen; Barlow, Robert S.; Hasse, Christian; Dreizler, Andreas; Geyer, Dirk
Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics Artikel
In: Combustion and Flame, Bd. 210, S. 426–438, 2019.
@article{Butz.2019,
title = {Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics},
author = {David Butz and Sandra Hartl and Sebastian Popp and Steffen Walther and Robert S. Barlow and Christian Hasse and Andreas Dreizler and Dirk Geyer},
url = {https://www.sciencedirect.com/science/article/pii/S0010218019303967},
doi = {10.1016/j.combustflame.2019.08.032},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {210},
pages = {426–438},
abstract = {In practical applications, partial premixing of fuel and oxidizer, as well as recirculation of combustion products, result in complex combustion scenarios where multi-regime effects arise and a numerical representation of local reaction zones by purely premixed or purely non-premixed flame structures may not hold. Here, a novel burner system is introduced to investigate the fundamental characteristics of multi-regime combustion and to provide a basis for validating numerical models. This multi-regime burner (MRB) is specifically designed to produce flames with multi-regime characteristics while maintaining well-defined boundary conditions. Thermochemical data from Raman/Rayleigh/CO-LIF scattering experiments are provided for two selected operating conditions. The experimental investigation focuses on the overall flame structure by examining radial profiles of temperature and mixture fraction, as well as scatter plots of temperature, CH4, and CO versus mixture fraction. In order to assess the relative importance of different flame regimes, the gradient-free regime identification (GFRI) approach is extended to allow for an automated classification of local reaction zone structures. Classification criteria are defined, based on the ratio of local heat release rate peaks associated with premixed and non-premixed reaction zones located in close spatial proximity, and an automated process is implemented to classify 1D Raman/Rayleigh sample lines as premixed, dominantly premixed, multi-regime, dominantly non-premixed, or non-premixed flame zones. The importance of different flame zones, indicated by their population fractions, are found to evolve with downstream distance and show distinct differences between the two selected flames. Further, a prior analysis is used to test the applicability of 1D flame structure assumptions for the underlying combustion regime.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, S.; Winkle, R.; Geyer, D.; Dreizler, A.; Magnotti, G.; Hasse, C.; Barlow, R. S.
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2297–2305, 2019.
@article{Hartl.2019,
title = {Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames},
author = {S. Hartl and R. Winkle and D. Geyer and A. Dreizler and G. Magnotti and C. Hasse and R. S. Barlow},
doi = {10.1016/j.proci.2018.06.067},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2297–2305},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2297-2305. doi:10.1016/j.proci.2018.06.067},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, Sandra; Geyer, Dirk; Hasse, Christian; Zhao, Xinyu; Wang, Haiou; Barlow, Robert S.
Assessing an experimental approach for chemical explosive mode and heat release rate using DNS data Artikel
In: Combustion and Flame, Bd. 209, S. 214–224, 2019.
@article{Hartl.2019b,
title = {Assessing an experimental approach for chemical explosive mode and heat release rate using DNS data},
author = {Sandra Hartl and Dirk Geyer and Christian Hasse and Xinyu Zhao and Haiou Wang and Robert S. Barlow},
doi = {10.1016/j.combustflame.2019.07.038},
year = {2019},
date = {2019-01-01},
journal = {Combustion and Flame},
volume = {209},
pages = {214–224},
abstract = {Combustion and Flame, 209 (2019) 214-224. doi:10.1016/j.combustflame.2019.07.038},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Schneider, Silvan; Geyer, Dirk; Magnotti, Gaetano; Dunn, Matthew J.; Barlow, Robert S.; Dreizler, Andreas
Structure of a stratified CH4 flame with H2 addition Artikel
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2307–2315, 2019.
@article{Schneider.2019,
title = {Structure of a stratified CH4 flame with H2 addition},
author = {Silvan Schneider and Dirk Geyer and Gaetano Magnotti and Matthew J. Dunn and Robert S. Barlow and Andreas Dreizler},
doi = {10.1016/j.proci.2018.06.205},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2307–2315},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2307-2315. doi:10.1016/j.proci.2018.06.205},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Straub, C.; Kronenburg, A.; Stein, O. T.; Barlow, R. S.; Geyer, D.
Modeling stratified flames with and without shear using multiple mapping conditioning Artikel
In: Proceedings of the Combustion Institute, Bd. 37, Nr. 2, S. 2317–2324, 2019.
@article{Straub.2019,
title = {Modeling stratified flames with and without shear using multiple mapping conditioning},
author = {C. Straub and A. Kronenburg and O. T. Stein and R. S. Barlow and D. Geyer},
doi = {10.1016/j.proci.2018.07.033},
year = {2019},
date = {2019-01-01},
journal = {Proceedings of the Combustion Institute},
volume = {37},
number = {2},
pages = {2317–2324},
abstract = {Proceedings of the Combustion Institute, 37 (2018) 2317-2324. doi:10.1016/j.proci.2018.07.033},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Straub, Carmen; Kronenburg, Andreas; Stein, Oliver T.; Kuenne, Guido; Janicka, Johannes; Barlow, Robert S.; Geyer, Dirk
In: Combustion and Flame, Bd. 196, S. 325–336, 2018.
@article{Straub.2018,
title = {Multiple mapping conditioning coupled with an artificially thickened flame model for turbulent premixed combustion},
author = {Carmen Straub and Andreas Kronenburg and Oliver T. Stein and Guido Kuenne and Johannes Janicka and Robert S. Barlow and Dirk Geyer},
doi = {10.1016/j.combustflame.2018.05.021},
year = {2018},
date = {2018-01-01},
journal = {Combustion and Flame},
volume = {196},
pages = {325–336},
abstract = {Combustion and Flame, 196 (2018) 325-336. doi:10.1016/j.combustflame.2018.05.021},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartl, Sandra; Geyer, Dirk; Dreizler, Andreas; Magnotti, Gaetano; Barlow, Robert S.; Hasse, Christian
Regime identification from Raman/Rayleigh line measurements in partially premixed flames Artikel
In: Combustion and Flame, Bd. 189, S. 126–141, 2018.
@article{Hartl.2018,
title = {Regime identification from Raman/Rayleigh line measurements in partially premixed flames},
author = {Sandra Hartl and Dirk Geyer and Andreas Dreizler and Gaetano Magnotti and Robert S. Barlow and Christian Hasse},
doi = {10.1016/j.combustflame.2017.10.024},
year = {2018},
date = {2018-01-01},
journal = {Combustion and Flame},
volume = {189},
pages = {126–141},
abstract = {Combustion and Flame, 189 (2017) 126-141. doi:10.1016/j.combustflame.2017.10.024},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Optische Diagnosemethoden und Erneuerbare Energien
Fachbereich Maschinenbau und Kunststofftechnik
Optische Diagnosemethoden und Erneuerbare Energien
Fachbereich Maschinenbau und Kunststofftechnik
