Results 211 to 220 of about 3,256 (259)

Flame wall interaction: effect of stretch

Experimental Thermal and Fluid Science, 2003
An experimental study of flame-wall interaction is presented. The flame is a laminar, flat methane-air one at three different equivalent ratio: 1, 0.8, 0.6. Temporal PIV system was used to acquire images sequences of the interaction. Evolution of velocity field and flame contour shows that stagnation points appear between the reactive zone and the wall.
Fabrice Foucher, M Trinīte
exaly   +5 more sources

IMPACT OF STRETCH ON THE FLAME DYNAMICS OF LAMINAR PREMIXED FLAMES

Inter-Noise 2022, 2023
Flame transfer functions (FTF) of laminar premixed flames acoustically forced are analytically investigated and modelled. The study is based on the linearized G-equation, which is used to kinematically track the flame front. In order to incorporate combustion properties, the laminar consumption speed is considered varying depending on the flame front ...
Edoardo Scoletta, Wolfgang Polifke
openaire   +1 more source

On the stability of stretched flames

Combustion Theory and Modelling, 1997
It is shown that the well known difficulty concerning the unconditional stability of a planar flame sustained in a stagnation-point flow is due to the infinite aspect length scale of the system. In finite geometries occurring in numerical and laboratory experiments the flame may well become unstable provided the flow-induced stretch is weak enough.
Y. Kortsarts, I. Brailovsky, S. Gutman, G.I. Sivashinsky   +3 more
openaire   +1 more source

Flame Stretch and the Balance Equation for the Flame Area

Combustion Science and Technology, 1990
Abstract When a flame propagates in a nonuniform flow it experiences strain and curvature effects. The fractional rate of change of the flame area constitutes the flame stretch. This quantity is often used to describe the structure and extinction mechanisms of turbulent flames. It also occurs in many recent studies of premixed laminar flames.
SEBASTIEN M. CANDEL, THIERRY J. POINSOT
openaire   +1 more source

Flame stretch effects on partially premixed flames

Combustion and Flame, 2000
Abstract Flame stretch is an important characteristic of flame behavior that arises due to flow motion and nonuniformity, and flame curvature. Various investigators have obtained different expressions for flame stretch by employing dissimilar analytical approaches for diverse flame configurations.
Chun W Choi, Ishwar K Puri
openaire   +1 more source

On Flame Stretch

Combustion Science and Technology, 1983
Abstract A general invariant expression is derived for the stretch experienced by a flame due either to its motion or to the nonuniform flow of the gas through it. This expression is given in terms of the local fluid velocity and the shape of the flame front. Specific examples in which the flame stretch takes a simplified form are discussed.
openaire   +1 more source

On the burning velocity of stretched flames

Combustion and Flame, 1991
Abstract The term “burning velocity” is commonly defined as the velocity of the gas ahead of and relative to the flame. This definition is appropriate for a one-dimensional flow because the mass flow rate across the flame is constant. In more general circumstances, however, this definition becomes ambiguous because the mass flow rate varies with ...
J.H. Tien, M. Matalon
openaire   +1 more source

The effects of radiation on stretched flames

35th Aerospace Sciences Meeting and Exhibit, 1997
We examine the behaviour of twin premixed flames in a symmetric counterflow, subject to radiation losses, a problem motivated by recent drop-tower experiments. A simple asymptotic strategy is adopted which complements recent numerical simulations and provides new insights.
J. Buckmaster, J. Buckmaster
openaire   +2 more sources

The cylindrical stretched flame

Combustion and Flame, 1984
For sufficiently cool remote gases, the cylindrical stretched flame shows classical ignition-extinction behavior. For remote gas temperatures close to the adiabatic flame temperature, the flame response is qualitatively different, with negative flame speed solutions which may be physically accessible.
openaire   +1 more source