Letteratura scientifica selezionata sul tema "Flamme front instabilities"
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Articoli di riviste sul tema "Flamme front instabilities"
Ayoobi, Mohsen, e Ingmar Schoegl. "Numerical analysis of flame instabilities in narrow channels: Laminar premixed methane/air combustion". International Journal of Spray and Combustion Dynamics 9, n. 3 (5 giugno 2017): 155–71. http://dx.doi.org/10.1177/1756827717706009.
Testo completoXia, Yongfang, Tingyong Fang, Haitao Wang, Erbao Guo e Jinwei Ma. "Numerical investigation of low-velocity filtration combustion instability based on the initial preheating non-uniformity". E3S Web of Conferences 136 (2019): 02040. http://dx.doi.org/10.1051/e3sconf/201913602040.
Testo completoCLAVIN, P., L. MASSE e F. A. WILLIAMS. "COMPARISON OF FLAME-FRONT INSTABILITIES WITH INSTABILITIES OF ABLATION FRONTS IN INERTIAL-CONFINEMENT FUSION". Combustion Science and Technology 177, n. 5-6 (aprile 2005): 979–89. http://dx.doi.org/10.1080/00102200590926950.
Testo completoKrikunova, Anastasia. "Numerical simulation of combustion instabilities under the alternating gravity conditions". MATEC Web of Conferences 209 (2018): 00005. http://dx.doi.org/10.1051/matecconf/201820900005.
Testo completoAltantzis, C., C. E. Frouzakis, A. G. Tomboulides, M. Matalon e K. Boulouchos. "Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames". Journal of Fluid Mechanics 700 (18 maggio 2012): 329–61. http://dx.doi.org/10.1017/jfm.2012.136.
Testo completoKUSKE, R., e P. MILEWSKI. "Modulated two-dimensional patterns in reaction–diffusion systems". European Journal of Applied Mathematics 10, n. 2 (aprile 1999): 157–84. http://dx.doi.org/10.1017/s095679259800360x.
Testo completoYang, Sheng, Abhishek Saha, Fujia Wu e Chung K. Law. "Morphology and self-acceleration of expanding laminar flames with flame-front cellular instabilities". Combustion and Flame 171 (settembre 2016): 112–18. http://dx.doi.org/10.1016/j.combustflame.2016.05.017.
Testo completoSteinbacher, Thomas, e Wolfgang Polifke. "Convective Velocity Perturbations and Excess Gain in Flame Response as a Result of Flame-Flow Feedback". Fluids 7, n. 2 (31 gennaio 2022): 61. http://dx.doi.org/10.3390/fluids7020061.
Testo completoNOVICK-COHEN, A., e G. I. SIVASHINSKY. "Hydrodynamic Instabilities in Flame Fronts: Breathing Solutions". Combustion Science and Technology 46, n. 1-2 (aprile 1986): 109–11. http://dx.doi.org/10.1080/00102208608959795.
Testo completoZhang, Xinyi, Chenglong Tang, Huibin Yu e Zuohua Huang. "Flame-Front Instabilities of Outwardly Expanding Isooctane/n-Butanol Blend–Air Flames at Elevated Pressures". Energy & Fuels 28, n. 3 (10 marzo 2014): 2258–66. http://dx.doi.org/10.1021/ef4025382.
Testo completoTesi sul tema "Flamme front instabilities"
Hok, Jean-Jacques. "Stratégie de modélisation pour la simulation aux grandes échelles d'explosions de mélanges hydrogène-air pauvres". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP065.
Testo completoThe climate crisis the world faces today calls for immediate actions to curb down carbon emissions. In particular, a rapid energy transition towards cleaner sources is necessary. Among many candidates, hydrogen stands out as a carbon-free energy vector. However, its storage and transport in big quantities raise safety concerns. Following a leakage, mixed with the surrounding air, this hydrogen can form a highly flammable mixture. In case of accidental ignition of this mixture, different combustion scenarios and regimes are possible, depending on factors such as geometry (dimensions, confinement, presence of obstacles), mixture composition, temperature, pressure or turbulence level. These regimes range from slow deflagration to the transition to detonation in the worst case. To predict the damage induced by an explosion, Computational Fluid Dynamics has the advantage of being safer than experiments and gives access to quantities hard or impossible to measure empirically. This thesis deals with the prediction of lean hydrogen-air explosions using Large-Eddy Simulation (LES). Lean H2-air mixtures are known for their distinctive sub-unity Lewis number, which characterises an unbalance between molecular and heat diffusion processes with major consequences: (1) lean H2-air flames are strongly sensitive to stretch; (2) they are prone to develop flame front cells due to the thermo-diffusive instability. Both constitute accelerating mechanisms which impact the overpressure generated during the explosion. In this work, we show that the Thickened Flame (TF) approach to simulate sub-unity Lewis number flames: (1) induces an amplification of stretch on the flame; (2) combined with the low grid resolution in LES, filters out flame front instabilities. The coupling of these undesired mechanisms can generate an erroneous flame propagation which questions the predictability of LES for lean H2-air explosions. In this thesis, a modelling strategy is proposed to reliably and accurately predict lean hydrogen-air explosions. A new paradigm is considered to separately correct the amplification of stretch effects and model subgrid phenomena due to the thermo-diffusive instability. These two corrections are first developed on canonical configurations and then extended and validated on more realistic explosion configurations
Radisson, Basile. "Dynamique non linéaire de fronts de flammes : expériences et modélisation". Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0124.
Testo completoIn many applications where premixed combustion is involved, the flame thickness is weak compared to the scales of the flow. This property allows to describe the flame frontevolution as an interface dynamics. In this manuscript some experiments are performed in order to check the validity of such models. The experiments are carried out in a Hele-Shaw burner. This quasi-bidimensional configuration allows for an accurate analysis ofthe flame front evolution. First, the dynamics of an initially flat flame propagating in aquiescent flow are analyzed. A quantitative comparison of an experimental flame evolution with the one predicted by a Michelson-Sivashinsky type equation is obtained for the firsttime. Moreover, the analytic pole solutions of this model allows us to predict some statisticproperties of the flame front. These predictions are shown to still be valid at large time,where the external noise plays an important role in the observed dynamics. In a second part, flame/burner interactions are investigated. A new vibroacoustic coupling mechanismis identified. Then, harnessing the properties of this vibroacoustic coupling, the flame issubmitted to an oscillating flow. It allows us to explore some characteristics of the flame response to a time dependent external forcing. Finally, the flame is submitted to a weaklyturbulent flow. The influence of the flow fluctuations intensity on the turbulent flamespeed is explored. The flame speed increase is shown to switch from a sublinear regime atsmall forcing to a superlinear one when the forcing intensity is approaching the laminar flame speed value
Boury, Gaël. "Etudes théoriques et numériques de fronts de flammes plissées : dynamiques non-linéaires libres ou bruitées". Poitiers, 2003. http://www.theses.fr/2003POIT2255.
Testo completoUsually, premixed flames are thin. We view them as active interfaces. Evolution Equations for their front are obtained from asymptotic expansions in the density-contrast. Flame dynamics seems accurately controlled only by the interplay amongst elliptic hydrodynamics, a geometric non-linearity coming from the flame normal propagation (Huygens), the change in density, and the overall geometry, provided minimal symmetries (Galilean, translation, rotation) are fulfilled, or explicitly broken. Examining three configurations confirms the thesis, namely: flames anchored in the presence of a strong tangential blowing and external forcing, influence of a weak gravity field, 3-Dimensional expansions. Our methods are analytical and pseudo-spectral. In each case, scaling laws for wrinkling are identified. These are in good agreement with available experiments. Open problems are also evoked
Atti di convegni sul tema "Flamme front instabilities"
BYCHKOV, VITALIY. "FLAME FRONT INSTABILITIES AND DEVELOPMENT OF FRACTAL FLAMES". In Conference on Fractals 2002. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777720_0021.
Testo completoBaghirzade, Mammadbaghir, Md Nayer Nasim, Behlol Nawaz, Jonathan Aguilar, Martia Shahsavan, Mohammadrasool Morovatiyan e John Hunter Mack. "Analysis of Premixed Laminar Combustion of Methane With Noble Gases as a Working Fluid". In ASME 2021 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icef2021-67516.
Testo completoGopalakrishnan, Harish Subramanian, Andrea Gruber e Jonas Moeck. "Computation of Intrinsic Instability and Sound Generation From Autoignition Fronts". In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82480.
Testo completoOravecz, Lisa M., Indrek S. Wichman e Sandra L. Olson. "Instability of Flame Spread in Microgravity". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1118.
Testo completoMalanoski, Michael, Michael Aguilar, Jacqueline O’Connor, Dong-hyuk Shin, Bobby Noble e Tim Lieuwen. "Flame Leading Edge and Flow Dynamics in a Swirling, Lifted Flame". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68256.
Testo completoFu, X., H. Wen, Q. Xie e B. Wang. "Research on Characteristics of Thermoacoustic Instabilities in Air-Methane-Ammonia Premixed Swirl-Stabilized Combustors". In Proceedings of the 10th INTERNATIONAL SEMINAR ON FLAME STRUCTURE Novosibirsk, Russia October 9-13, 2023. Crossref, 2023. http://dx.doi.org/10.53954/9785605098669_197.
Testo completoLee, Doh-Hyoung, e Tim C. Lieuwen. "Acoustic Nearfield Characteristics of a Premixed Flame in a Longitudinal Acoustic Field". In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0040.
Testo completoShrivastava, Sourabh, Ishan Verma, Rakesh Yadav e Pravin Nakod. "Solution-Based Mesh Adaption Criteria Development for Accelerating Flame Tracking Simulations". In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82620.
Testo completoIga, Yuka, Makoto Hiranuma, Takashi Shimura e Toshiaki Ikohagi. "Numerical Study of Cavitation Instabilities Arising in Cascade With Slit". In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77299.
Testo completoEriksson, Pontus. "The Zimont TFC Model Applied to Premixed Bluff Body Stabilized Combustion Using Four Different RANS Turbulence Models". In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27480.
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