Results 271 to 280 of about 760,958 (323)

Impacts of wall conditions on flame acceleration at the early stages of burning in channels

Physical Review Fluids, 2022
The role of mechanistic (shear stress) and thermal wall conditions on the scenario of finger-shaped flame acceleration at the early stages of burning in channels is studied by means of computational simulations of the reacting flow equations involving ...
Mohammed H. Alkhabbaz, Furkan Kodakoglu, D. Valiev, V. Akkerman   +3 more
semanticscholar   +1 more source

Acceleration Effects on the Stability of Flame Propagation

SIAM Journal on Applied Mathematics, 1979
We 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.
openaire   +2 more sources

Knock: Flame acceleration or spontaneous ignition?

Combustion and Flame, 1968
There is no general agreement on the precise mechanism by which knock occurs; contrasting theories attribute the phenomenon to extremely rapid flame propagation or to the spontaneous ignition of the end gas. Experiments designed to resolve this question have been made with a rapid compression machine.
W.S. Affleck, A. Fish
openaire   +1 more source

Flame acceleration due to flame-induced instabilities in large-scale explosions

Combustion and Flame, 2001
Large-scale explosions of initially quiescent methane-air and propane-air mixtures at atmospheric pressure are reported, in which the flame speed of a hemispherical flame is measured up to radii just beyond 3 m. A cellular flame is developed fairly soon and thereafter the flame speed increases continually with the square root of the time.
D. Bradley, T.M. Cresswell, J.S. Puttock
openaire   +1 more source

Flame acceleration and explosion safety applications

Proceedings of the Combustion Institute, 2011
Abstract Accidental explosions of flammable gases and reactive gas mixtures remain a significant concern in process industries. The present paper reviews the basic mechanism of Flame Acceleration (FA), the results of recent studies on FA, and their application to explosion safety.
openaire   +1 more source

Self-acceleration of nuclear flames in supernovae

Space Science Reviews, 1995
The speed of the laminar flame in a degenerate carbon-oxygen white dwarf is too slow to produce a Type I supernova. We draw attention to the role of the Landau instability in wrinkling the flame front. This roughening of the front surface can cause an appreciable enhancement in the flame velocity.
S. I. Blinnikov, P. V. Sasorov, S. E. Woosley   +2 more
openaire   +1 more source

Accelerated flames and detonation in gases

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1958
The dynamics of accelerated flames in gases, and the transition to detonation are considered. It is shown that in the pre-detonation stage of an accelerated flame there is a fall in pressure and density behind the flame front, and that there the gas velocity is in the opposite direction to the motion of the flame.
openaire   +1 more source

Flame acceleration in long narrow open channels

Proceedings of the Combustion Institute, 2013
Abstract We study the propagation of premixed flames in long but finite channels, when the mixture is ignited at one end and both ends remain open and exposed to atmospheric pressure. Thermal expansion produces a continuous flow of burned gas directed away from the flame and towards the end of the channel where ignition took place.
Vadim N. Kurdyumov, Moshe Matalon
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Local flame front disturbance development under acceleration

Combustion and Flame, 1991
Abstract The development of a local flame front disturbance in an accelerating gas flow was explored using high-speed schlieren photography. The movement of the local flame front was examined in detail, and, based on these results, the flow field around the disturbed flame front was inferred.
Takashi Tsuruda, Toshisuke Hirano
openaire   +1 more source

Flame Acceleration in Reactive Gas Flows

2016
The experimental conditions considered when the certain estimations of the character of the flow in the installation must be performed to exclude the factors, which should hinder obtaining the results required. The evidence are obtained for the occurrence of the ignition of diluted stoichiometric methane-oxygen mix (total pressure up to 200 Torr ...
openaire   +1 more source