Results 201 to 210 of about 2,511 (241)
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Premixed edge flame in a counterflow field with a stretch rate gradient
Combustion and Flame, 2003Abstract An edge flame was established in a counterflow field with a stretch rate gradient using twin rectangular burners which were misaligned by a few degrees. The stretch rate gradient was quantitatively defined as a function of the angle between the two burners and the distance from the edge of the burner, and thus the effect of stretch rate ...
Goro Masuya
exaly +2 more sources
Combustion and Flame, 2021
Abstract This study delivered a reassessment of the two-dimensional (2-D) velocity boundary effect on the determination of the extinction stretch rate and the laminar flame speed using the counterflow flame configuration. Experimental and numerical results showed that the extinction stretch rate was sensitive to the burner exit stretch rate, the ...
Hai Zhang, Yuxin Wu
exaly +2 more sources
Abstract This study delivered a reassessment of the two-dimensional (2-D) velocity boundary effect on the determination of the extinction stretch rate and the laminar flame speed using the counterflow flame configuration. Experimental and numerical results showed that the extinction stretch rate was sensitive to the burner exit stretch rate, the ...
Hai Zhang, Yuxin Wu
exaly +2 more sources
Stretch rate of tubular premixed flames
Combustion and Flame, 2006Abstract Following Seshadri and Williams solution describing the flow field for the opposed jet burner, the analytical solution is given for the flow field of two other burners: the opposed tubular burner and the tubular burner. Under plug flow boundary conditions, it is shown that the stretch rate at the stagnation surface of the opposed tubular ...
Peiyong Wang +2 more
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Combustion and Flame, 2003
Local propagation speeds and stretch rates were measured along a premixed flame that undergoes unsteady wrinkling in order to see if these two quantities correlate in the manner that is predicted by the theory of flame stretch. The Markstein number, which relates these two quantities, also was measured.
Jose O. Sinibaldi +4 more
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Local propagation speeds and stretch rates were measured along a premixed flame that undergoes unsteady wrinkling in order to see if these two quantities correlate in the manner that is predicted by the theory of flame stretch. The Markstein number, which relates these two quantities, also was measured.
Jose O. Sinibaldi +4 more
openaire +1 more source
Flame stretch rate as a determinant of turbulent burning velocity
Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1992Abstract A rational basis for correlating turbulent burning velocities is shown to involve the product of the Karlovitz stretch factor and the Lewis number. A generalized expression is derived to show how flame stretch is related to the velocity field.
D. Bradley, A. K. C. Lau, M. Lawes
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Effects Of Equivalence Ratio On the Extinction Stretch Rate Of Cylindrical Premixed Flames
Combustion Science and Technology, 1993Abstract The actual flame stretch rates of the stretched cylindrical premixed flame and counterflow twin flames were measured with LDV for the methane-air and propane-air mixtures over a wide range of equivalence ratios. The stretch rate at the flame center at the point of flame extinction was considered to be the maximum stretch rate for the existence
HIDEAKI KOBAYASHI, MICHIO KITANO
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Extinction of Counterflow Premixed Flames Under Periodic Variation of the Rate of Stretch
Combustion Science and Technology, 1995Abstract The influence of periodic oscillations of the rate of stretch on the extinction of lean methane-air and butane-air premixed flames in stagnation-point flow and counterflow is experimentally investigated. The periodic variation of the rate of stretch is achieved by means of two speakers that are attached to the conventional counterflow burners.
H. G. PEARLMAN, S. H. SOHRAB
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Generation of PDFS for flame curvature and for flame stretch rate in premixed turbulent combustion
Combustion and Flame, 2003Abstract Experimentally derived pdfs of turbulent, premixed, flame curvatures from a variety of sources, for a wide range of conditions are surveyed and a suitable expression sought to generalize these. This proves to be one based on the Damkohler number, Da.
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Laminar flame speeds and extinction stretch rates of selected aromatic hydrocarbons
Fuel, 2012Abstract The laminar flame speeds and premixed extinction limits of n -propylbenzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and toluene have been studied experimentally to assess the effects of different alkyl substitutions to the benzene ring on flame propagation and extinction. The experiments were carried out in a twin-flame counterflow
Xin Hui +5 more
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Burning characteristics of PMMA with varied stretch rates under stagnation-point diffusion flames
Combustion and Flame, 2020Abstract This study investigated the burning characteristics of PMMA with varied stretch rates under stagnation-point diffusion flames both theoretically and experimentally, focusing on the manner in which the surface energy balance and heat losses affected burning rate with varied stretch rates.
Shangqing Tao +5 more
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