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Heat Release Effects on Shear-Layer Growth and Entrainment

Hermanson, J. C. and Mungal, M. G. and Dimotakis, P. E. (1978) Heat Release Effects on Shear-Layer Growth and Entrainment. AIAA Journal, 25 (4). pp. 578-583. ISSN 0001-1452. doi:10.2514/3.9666.

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The effects of heat release were studied in a planar, gaseous reacting mixing layer formed between two subsonic freestreams; one containing hydrogen in an inert diluent, the other containing fluorine in an inert diluent. Sufficiently high concentrations of hydrogen and fluorine reactants were employed to produce adiabatic flame temperature rises of up to 940 K (adiabatic flame temperature of 1240 K absolute). Although the displacement thickness of the layer for a zero streamwise pressure gradient showed an increase with increasing heat release. the actual thickness of the mixing layer at a given downstream location was not observed to increase and, in fact, was characterized by a slight thinning. The overall entrainment into the layer was seen to be substantially reduced by heat release. The large-wale vortical nature of the flow appeared to persist over all levels of heat release in this investigation. Imposition of a favorable pressure gradient, though resulting in additional thinning of the layer was observed to have no resolvable effect on the amount of chemical product formation and hence on the mixing.

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Additional Information:Copyright @ 1985 by J. C. Hermanson. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. Presented as Paper 85-0142 at the AIAA 23rd Aerospace Sciences Meeting. Reno. NV, Jan. 14-17, 1985; received Sept. 15, 1985; revision received Sept. 15, 1986. The assistance of C. E. Frieler as well as the expert help of Mr. Earl E. Dahl in running the experiments reported here is greatly appreciated. The authors would also like to acknowledge many helpful discussions with Dr. J. E. Broadwell. This work was sponsored by the Air Force Office of Scientific Research under Contract F4920-79-C-0159 and Grant 83-0213.
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Air Force Office of Scientific Research (AFOSR)F49620-79-C-0159
Air Force Office of Scientific Research (AFOSR)83-0213
Issue or Number:4
Record Number:CaltechAUTHORS:20141020-151118820
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Official Citation:J. C. HERMANSON, M. G. MUNGAL, and P. E. DIMOTAKIS. "Heat release effects on shear-layer growth and entrainment", AIAA Journal, Vol. 25, No. 4 (1987), pp. 578-583. doi: 10.2514/3.9666
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50573
Deposited On:20 Oct 2014 22:21
Last Modified:10 Nov 2021 18:57

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