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RESEARCH PAPERS: Internal Combustion Engines

Mixing of Multiple Jets With a Confined Subsonic Crossflow: Part II—Opposed Rows of Orifices in Rectangular Ducts

[+] Author and Article Information
J. D. Holdeman

NASA Glenn Research Center, Cleveland, OH 44135

D. S. Liscinsky

United Technologies Research Center, East Hartford, CT 06108

D. B. Bain

CFD Research Corporation, Huntsville, AL 35805

J. Eng. Gas Turbines Power 121(3), 551-562 (Jul 01, 1999) (12 pages) doi:10.1115/1.2818508 History: Revised March 15, 1997; Online December 03, 2007

Abstract

This paper summarizes experimental and computational results on the mixing of opposed rows of jets with a confined subsonic crossflow in rectangular ducts. The studies from which these results were excerpted investigated flow and geometric variations typical of the complex three-dimensional flowfield in the combustion chambers in gas turbine engines. The principal observation was that the momentum-flux ratio, J, and the orifice spacing, S/H, were the most significant flow and geometric variables. Jet penetration was critical, and penetration decreased as either momentum-flux ratio or orifice spacing decreased. It also appeared that jet penetration remained similar with variations in orifice size, shape, spacing, and momentum-flux ratio when the orifice spacing was inversely proportional to the square-root of the momentum-flux ratio. It was also seen that planar averages must be considered in context with the distributions. Note also that the mass-flow ratios and the orifices investigated were often very large (jet-to-mainstream mass-flow ratio > 1 and the ratio of orifices-area-to-mainstream-cross-sectional-area up to 0.5, respectively), and the axial planes of interest were often just downstream of the orifice trailing edge. Three-dimensional flow was a key part of efficient mixing and was observed for all configurations.

Copyright © 1999 by The American Society of Mechanical Engineers
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