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Published 1989 | public
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A Model for Reactions in Turbulent Jets: Effects of Reynolds, Schmidt, and Damköhler Numbers

Broadwell, James E.
Others:
Borghi, R.
Murthy, S. N. B.
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Abstract

Data from several recent experiments on mixing and chemical reactions in turbulent shear layers and jets is discussed in detail and used to formulate a picture of the path from the freestream to the molecularly mixed State. A model is proposed which incorporates the essential steps in this path and which appears to provide a framework for understanding the major effects of Reynolds, Schmidt, and Damköhler numbers on the chemical reaction. A simplified version of the model reproduces the observed Reynolds number dependence of nitric oxide production in turbulent fuel jets.

Additional Information

© 1989 Springer-Verlag New York Inc. This paper is extracted from a summary report on mixing and reactions in shear layers and jets that is in preparation in collaboration with Godfrey M. Mungal. His assistance as well as that of the author's GALCIT colleagues is gratefully acknowledged. The ideas of Roddam Narasimha and Anatol Roshko concerning the volume fraction in which dissipation occurs helped greatly to clarify the relationship between dissipation and scalar mixing. The author also thanks Werner Dahm and Manooch Koochesfahani for permission to use figures from their theses and for many instructive discussions of their work. We wish to acknowledge support for this work by the Air Force Office of Scientific Research under Contract No. F49602-79-C-0159 and Grant No. M'OSR-83-0213, the Office of Naval Research under Contract No. 00014-85-k-06116, and the Gas Research Institute under Grant No. 5083-260-0878.

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