Results 231 to 240 of about 1,693,376 (277)

Low-Speed Flames

2003
In Chapter 21 the interface moved with the local fluid velocity only, and individual fluid particles did not cross the interface. In this chapter we consider interfaces across which a chemical reaction is converting one incompressible fluid into another.
Stanley Osher, Ronald Fedkiw
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Flame Broadening Effects on Premixed Turbulent Flame Speed

Combustion Science and Technology, 1992
Abstract Yakhot's turbulent flame speed model is extended to include the effects of scales smaller than the laminar flame thickness (δ). An expression for the turbulent flame speed (ST) as a function of the turbulence intensity (u') and turbulent Reynolds number is derived.
PAUL D. RONNEY, VICTOR YAKHOT
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Turbulent Flame Speeds of Premixed Supersonic Flame Kernels

Flow, Turbulence and Combustion, 2018
It is unclear whether turbulent flame speed scalings established in low speed regimes are applicable to supersonic flames. To investigate this question, the canonical flame kernel is investigated in a scramjet-like channel having a one degree wall divergence. The growth, shape and internal kernel dynamics are investigated.
Bradley A. Ochs, Dan Fries, Devesh Ranjan, Suresh Menon   +3 more
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The Relationship of the Laminar Flame Width to Flame Speed

Combustion Science and Technology, 1986
Abstract The width ( δ ) of a laminar flame is often characterized as a basic property of the flame and is sometimes used in turbulent combustion models to categorize the turbulence scale of the mixture. From computed flame speeds and temperature profiles of C3H8/Oa/Ns (o=1) flames we have determined widths, using definitions based on ( dT*sol;dx)max ...
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Modeling maximum flame speeds

Nuclear Engineering and Design, 1996
Abstract A simple gold model for flame acceleration in tubes, caused by repeated obstacles, has been developed using a “boxcar” approach. The tube is assumed to consist of a series of chambers separated by obstacles. The feedback mechanism for flame acceleration is modeled by assuming that the effective burning velocity in the nth chamber depends on ...
C.K. Chan, J.L. Loesel Sitar, R. Beauvais, F. Mayinger   +3 more
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The Turbulent Flame Speed of Premixed Spherically Expanding Flames

2017
Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field.
G. K. Giannakopoulos, C. E. Frouzakis, M. Matalon, A. G. Tomboulides   +3 more
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Flame Speed and Self-Similar Propagation of Expanding Turbulent Premixed Flames

Physical Review Letters, 2012
In this Letter we present turbulent flame speeds and their scaling from experimental measurements on constant-pressure, unity Lewis number expanding turbulent flames, propagating in nearly homogeneous isotropic turbulence in a dual-chamber, fan-stirred vessel.
Swetaprovo, Chaudhuri, Fujia, Wu, Delin, Zhu, Chung K, Law   +3 more
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Evolution of local flame displacement speeds in turbulence

Journal of Fluid Mechanics, 2019

Himanshu L. Dave, Swetaprovo Chaudhuri
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Asymptotic flame shapes and speeds of hydrodynamically unstable laminar flames

Symposium (International) on Combustion, 1998
The self-induced baroclinic instability of flames, the Landau-Darrieus instability, is studied numerically in the nonlinear range. A level set (G equation) based approach accounting for heat-release effects is used to follow the flame response to initial perturbation and shape evolution.
Li-Zheng Ma, Jerzy Chomiak
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An experimental investigation on flame interaction and the existence of negative flame speeds

Symposium (International) on Combustion, 1985
Downstream interaction between two counterflow premixed flames of different stoichiometries are investigated. Various flame configurations are observed and quantified; these include the binary system of two lean or rich flames, the triplet system of a lean and a rich flame separated by a diffusion flame, and single diffusion flames with some degree of ...
S.H. Sohrab, Z.Y. Ye, C.K. Law
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