Results 141 to 150 of about 1,884 (175)
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Propagation of Spherically Expanding Turbulent Flames into Fuel Droplet-Mists
Flow, Turbulence and Combustion, 2019The effects of droplet diameter and the overall (liquid+gas) equivalence ratio on flame topology and propagation statistics in spherically expanding turbulent n-heptane spray flames have been analysed based on three-dimensional Direct Numerical Simulations (DNS) data.
Ozel-Erol G +3 more
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Spherical expanding flames in H2–N2O–Ar mixtures: flame speed measurements and kinetic modeling
International Journal of Hydrogen Energy, 2009Abstract Although ignition of hydrogen–nitrous oxide mixtures is a serious issue for nuclear waste storage and semi-conductor manufacturing, available flame speed data have not been recently updated and thermodiffusive stability is not known. In order to palliate this, the flame speed of a hydrogen–nitrous oxide mixture diluted in Ar (60% mol) was ...
R. Mével +4 more
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Combustion and Flame, 2016
The determination of laminar burning velocity is a complex task. Even though its definition is well established, achieving a good and reliable value of this quantity seems to be too dependent on the experimental procedures. In this study, we report a rigorous derivation of the relation between the spatially averaged consumption speed and the absolute ...
Lefebvre, Alexandre +6 more
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The determination of laminar burning velocity is a complex task. Even though its definition is well established, achieving a good and reliable value of this quantity seems to be too dependent on the experimental procedures. In this study, we report a rigorous derivation of the relation between the spatially averaged consumption speed and the absolute ...
Lefebvre, Alexandre +6 more
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Hydrodynamic and diffusion effects on the stability of spherically expanding flames
Combustion and Flame, 1987We examine the stability of an outwardly propagating spherical flame accounting for both hydrodynamic and thermodiffusive effects. For Lewis numbers less than a critical value Le∗ Le∗, the flame, which is stable to thermodiffusive effects, becomes unstable only after a critical size is reached. This instability is hydrodynamic in nature and is caused
J.K. Bechtold, M. Matalon
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Determination of burning velocities from spherically expanding H 2 /air flames
Proceedings of the Combustion Institute, 2015Abstract Laminar burning velocities of hydrogen/air mixtures can show discrepancies up to 30%, making chemical mechanism validation and improvement difficult. The source of uncertainties may come from different factors influencing at each processing and post-processing steps the final value.
Varea, Emilien +4 more
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Parameter extraction from spherically expanding flames propagated in hydrogen/air mixtures
International Journal of Hydrogen Energy, 2019Abstract The characteristics of hydrogen/air flame were studied by using the spherical expanding flame propagated in a constant volume chamber. The influence of ignition induced blast wave and the flame instability on flame propagation was investigated. The nonlinear evaluation method for laminar flame parameter evaluation was established.
Qingming Liu +3 more
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Experimental study on self-acceleration in expanding spherical hydrogen-air flames
International Journal of Hydrogen Energy, 2018Abstract The development of cellularity for expanding spherical hydrogen-air flames at elevated pressure, owing to hydrodynamic and diffusional-thermal instabilities was experimentally investigated using high-speed schlieren images. The critical flame radii and critical Peclet numbers at which cracks begin to propagate and for the onset of flame ...
Wookyung Kim +5 more
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Observation and regime classification of pulsation patterns in expanding spherical flames
Physics of Fluids, 2010The development of pulsating instability in expanding spherical premixed flames was experimentally studied, leading to the observation and quantification of spiral waves and target patterns over the flame surfaces in rich hydrogen-air, rich hydrogen-oxygen, and lean butane-oxygen-helium mixtures at elevated pressures.
G. Jomaas, C. K. Law
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Experimental studies of high pressure combustion using spherically expanding flames
2017Experiments involving laminar, premixed, spherically expanding flames were performed using two different experimental facilities. The first one involves experiments in a cylindrical constant volume chamber with optical access in which the flame is directly observed with high speed imaging using the shadowgraph technique.
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