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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

EFFECTS OF HEAT RELEASE ON JET FLAMES IN CROSSFLOW

E.F. Hasselbrink Jr.
Mechanical Engineering Department Stanford University Stanford CA 93405-3032 USA

M. Godfrey Mungal
Mechanical Engineering Department, Stanford University, Stanford, CA 94305; Dean, School of Engineering, Santa Clara University, Santa Clara, CA 95053, USA

Abstract

Two methane jets of jet-to-crossflow blowing ratios r = 10 and r = 21 are studied using particle image velocimetry in order to determine the effects of heat release on the structure of the velocity field. It is found that heat release amplifies mean velocities and RMS fluctuations by a factor as large as 2−3 compared to non-reacting cases, depending on the location in the flame. This amplification factor is seen to be quite close to the square-root of the ratio of the burned and unburned gas temperatures, and reasons for this observation are discussed.