Results 241 to 250 of about 47,191 (297)
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Flame morphology and self-acceleration of syngas spherically expanding flames
International Journal of Hydrogen Energy, 2018Abstract The self-acceleration of spherically expanding flames were investigated using a constant volume combustion chamber for CO/H2/O2/N2 mixtures over a wide range of initial pressure from 0.2 to 0.6 MPa, CO/H2 ratio from 50/50 to 10/90 and equivalence ratio from 0.4 to 1.5.
Xiao Cai, Jinhua Wang, Haoran Zhao
exaly +2 more sources
Flame acceleration and transition to detonation in ducts
Progress in Energy and Combustion Science, 2008This paper reviews the state of knowledge on flame acceleration and deflagration-to-detonation transition (DDT) in smooth ducts and ducts equipped with turbulence-producing obstacles. The objective is to bring to light the basic understanding of the phenomenon and its application to explosion safety. The scope of the review is restricted to homogeneous
G Ciccarelli, S Dorofeev
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The role of shock–flame interactions on flame acceleration in an obstacle laden channel
Combustion and Flame, 2010Abstract Flame acceleration was investigated in an obstructed, square-cross-section channel. Flame acceleration was promoted by an array of top and bottom surface mounted obstacles that were distributed along the entire channel length at an equal spacing corresponding to one channel height.
G Ciccarelli, Craig T Johansen
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Explosion triggering by an accelerating flame
Physical Review E, 2006The analytical theory of explosion triggering by an accelerating flame is developed. The theory describes the structure of a one-dimensional isentropic compression wave pushed by the flame front. The condition of explosion in the gas mixture ahead of the flame front is derived; the instant of the explosion is determined provided that a mechanism of ...
Bychkov, Vitaly, Akkerman, V'yacheslav
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Statistical Study of Accelerating Flames
The Physics of Fluids, 1960Study of velocity fluctuations observed by means of ionization probes during the development of detonation reveals its significance as an indicator of physical characteristics of the flame. The scatter in time of arrival (the reciprocal of the velocity) was found normally distributed at an 85% probability level.
Stern, Raul A. +2 more
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Investigation of Flame Regimes for Flame Acceleration to Detonation
2018 Joint Propulsion Conference, 2018Expanding hydrogen-air flames are studied in a semi-confined duct with an optical access test section. The focus of the work is to characterize the regimes of flame development in a highly turbulent environment and observe the Deflagration-to-Detonation (DDT) phenomenon.
Chambers, Jessica M., Ahmed, Kareem A.
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Theory and modeling of accelerating flames in tubes
Physical Review E, 2005The analytical theory of premixed laminar flames accelerating in tubes is developed, which is an important part of the fundamental problem of flame transition to detonation. According to the theory, flames with realistically large density drop at the front accelerate exponentially from a closed end of a tube with nonslip at the walls.
Vitaly, Bychkov +3 more
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Acceleration Effects on the Stability of Flame Propagation
SIAM Journal on Applied Mathematics, 1979We consider the effect of acceleration on the diffusional thermal instability of a plane flame front in a premixed gaseous mixture. We recall that the diffusional thermal instability occurs if the Lewis number L of the mixture is less than a critical value $L_0 $.
Matkowsky, B. J., Sivashinsky, G. I.
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Convergence Acceleration for Steady Flame Computations
Journal of Computational Physics, 2000zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Cuenot, B. +2 more
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