Results 131 to 140 of about 1,904 (180)
Some of the next articles are maybe not open access.
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
Cellularization characteristics of ethyl acetate spherical expanding flame
Fuel, 2021Abstract The cellular instability of ethyl acetate (EA) premixed flame has been studied theoretically and experimentally under different initial temperature, pressure and equivalence ratio. The constant pressure method (CPM) was used to determine the laminar burning velocity of EA spherical expanding flame in this research.
Xiaolu Li +4 more
openaire +1 more source
Wrinkling of spherically expanding flames
Proceedings of the Combustion Institute, 2002The onset of instability and subsequent development of cells on spherically expanding flames is examined theoretically. The model used accounts for both hydronamic and diffusive-thermal effects and, in contrast to earlier theories, is valid for variable transport properties over a wide range of equivalence ratios.
R. Addabbo, J.K. Bechtold, M. Matalon
openaire +1 more source
Transition to detonation of an expanding spherical flame
Combustion and Flame, 2017Abstract With a freely expanding unwrinkled spherical flame as an example, it is shown that deflagration-to-detonation transition in unconfined gaseous systems is possible, provided the flame is close to its propagability threshold and the deficient reactant Lewis number is not too small.
Leonid Kagan, Gregory Sivashinsky
openaire +1 more source
Pressures and their venting in spherically expanding flames
Combustion and Flame, 1977Abstract The Paper gives an analysis of how pressure increases with the increasing radius of a flame in a spherical vessel where the flame is ignited at its centre and propagates symmetrically outwards to the wall. The major assumptions on which the analysis is based: adiabatic compression of the contents of the vessel, the absence of significant ...
V.M. Morton, M.A. Nettleton
openaire +1 more source
Investigations on the cellular instabilities of expanding hydrogen/methanol spherical flame
International Journal of Hydrogen Energy, 2021Abstract A comprehensive measurement and investigation of the cellularization of methanol/hydrogen flame is important for the thorough understanding of the transition of turbulent flame. In this work, a constant volume combustion bomb with schlieren photography technology is used to study the flame evolution of methanol/hydrogen fuel.
Han Wu +4 more
openaire +1 more source
On transition to cellularity in expanding spherical flames
Journal of Fluid Mechanics, 2007The instant of transition to cellularity of centrally ignited, outwardly propagating spherical flames in a reactive environment of fuelx–oxidizer mixture, at atmospheric and elevated pressures, was experimentally determined using high-speed schlieren imaging and subsequently interpreted on the basis of hydrodynamic and diffusional–thermal instabilities.
G. JOMAAS, C. K. LAW, J. K. BECHTOLD
openaire +1 more source
Cellularization of 2-methylfuran expanding spherical flame
Combustion and Flame, 2019Abstract Flame instabilities in 2-methylfuran (MF) outwardly propagating laminar flames have been investigated experimentally and theoretically at the initial pressures of 1–4 bar, temperatures of 363–423 K and equivalence ratios of 0.7–1.4. The flame topography and the effects of flame instability on MF burning speeds have been examined.
Francis Oppong +5 more
openaire +1 more source
Uncertainty reduction in laminar flame speed extrapolation for expanding spherical flames
Combustion and Flame, 2018Abstract The quantification and reduction of the uncertainties in the extrapolation process in laminar flame speed measurements were studied using expanding spherical flames under positive Markstein length (Lb> 0) conditions. The experimental and computational results were first compared showing their differences.
Jialong Huo +4 more
openaire +1 more source
Combustion and Flame, 2021
Abstract The modified models MLC (modified linear curvature model) and MNQ (modified nonlinear quasi-steady model) for the extrapolation of laminar flame speeds and Markstein lengths based on the expansion of the finite-structure stretched flames were derived from the mass conservation equation, which consider effects of finite flame thickness and ...
Tao Shu +3 more
openaire +1 more source
Abstract The modified models MLC (modified linear curvature model) and MNQ (modified nonlinear quasi-steady model) for the extrapolation of laminar flame speeds and Markstein lengths based on the expansion of the finite-structure stretched flames were derived from the mass conservation equation, which consider effects of finite flame thickness and ...
Tao Shu +3 more
openaire +1 more source