Results 61 to 70 of about 61,190 (204)
Investigation of differential diffusion in lean, premixed, hydrogen-enriched swirl flames
Applications in Energy and Combustion ScienceHydrogen combustion is a promising alternative to fossil fuel combustion in an effort to reduce our carbon footprint. However, hydrogen combustion is prone to thermodiffusive instabilities largely dependent on differential diffusion, a phenomenon that ...
Benjamin Francolini +5 more
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Gas Explosion Venting: External Explosion Turbulent Flame Speeds that Control the Overpressure
Chemical Engineering Transactions, 2016 In most vented explosions the peak overpressure is controlled by turbulent flame propagation external to the vent. This has been known for many years, but a method to predict the overpressure from the external flame speed has not been developed.
B. Fakandu +3 more
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Flame Annihilation Displacement Speed and Stretch Rate in Turbulent Premixed Flames
Flow, Turbulence and Combustion, 2019 This paper examines the dynamics of flame annihilation in turbulent premixed flames using a DNS dataset of Haghiri et al. (J. Fluid Mech. 843, 29 2018). Two theoretical frameworks are considered. The relative contributions of the reaction rate, normal diffusion and flame curvature to the flame displacement speed are first considered.
Haghiri, A +3 more
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The interaction of high-speed turbulence with flames: Global properties and internal flame structure [PDF]
Combustion and Flame, 2010 We study the dynamics and properties of a turbulent flame, formed in the presence of subsonic, high-speed, homogeneous, isotropic Kolmogorov-type turbulence in an unconfined system. Direct numerical simulations are performed with Athena-RFX, a massively parallel, fully compressible, high-order, dimensionally unsplit, reactive-flow code.
Poludnenko, Alexei Y., Oran, Elaine S.
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Anchoring of premixed jet flames in vitiated crossflow with pulsed nanosecond spark discharge
Applications in Energy and Combustion Science, 2020 This paper deals with the effect of non-equilibrium plasma on the anchoring of a premixed jet flame in hot vitiated crossflow at atmospheric pressure. The turbulent vitiated crossflow was generated by an array of 4×4 premixed turbulent jet flames burning
Sergey Shcherbanev +6 more
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Scaling transition of turbulent flame speed for thermodiffusively unstable flames
Physics of FluidsThis work presents an experimental set of Bunsen flames characterized by a moderate Reynolds number and a variable turbulence intensity. Ten lean hydrogen-enriched methane–air mixtures at three turbulence levels are investigated, ranging from methane–air to hydrogen–air mixtures. Such mixtures are selected to have an almost constant laminar flame speed
Guido Troiani +3 more
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Fluids, 2019 Boundary layer flashback from the combustion chamber into the premixing section is a threat associated with the premixed combustion of hydrogen-containing fuels in gas turbines. In this study, the effect of pressure on the confined flashback behaviour of
Aaron Endres, Thomas Sattelmayer
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Turbulent flame speed and morphology of pure ammonia flames and blends with methane or hydrogen
Proceedings of the Combustion Institute, 2022 S. Zitouni +2 more
semanticscholar +1 more source
Turbulent Flame Speed Scaling for Expanding Flames with Markstein Diffusion Considerations
, 2012 In this work we clarify the role of Markstein diffusivity on turbulent flame speed and it's scaling, from analysis and experimental measurements on constant-pressure expanding flames propagating in near isotropic turbulence. For all C0-C4 hydrocarbon-air mixtures presented in this work and recently published C8 data from Leeds, the normalized turbulent
Chaudhuri, Swetaprovo +2 more
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Results in EngineeringThis study experimentally investigates the turbulent flame speeds (St) of Gas-to-Liquids (GTL) fuel and a 50/50 blend with diesel across turbulence intensities (u') ranging from 0.5 to 3.0 m/s and equivalence ratios (Φ) from 0.7 to 1.3.
Abdellatif M. Sadeq +2 more
doaj +1 more source