Mixing of an Acoustically Excited Air Jet With a Confined Hot Crossflow

[+] Author and Article Information
P. J. Vermeulen, P. Grabinski, V. Ramesh

The University of Calgary, Department of Mechanical Engineering, Calgary, Alberta, Canada T2N 1N4

J. Eng. Gas Turbines Power 114(1), 46-54 (Jan 01, 1992) (9 pages) doi:10.1115/1.2906306 History: Received December 30, 1989; Online April 24, 2008


The mixing of an acoustically pulsed air jet with a confined hot crossflow has been assessed by temperature profile measurements. These novel experiments were designed to examine the effects of acoustic driver power and Strouhal number on jet structure, penetration, and mixing. The results showed that excitation produced strong changes in the measured temperature profiles. This resulted in significant increases in mixing zone size, penetration (at least 100 percent increase), and mixing, and the length to achieve a given mixed state was shortened by at least 70 percent. There was strong modification to the jet-wake region. The increase in jet penetration and mixing was saturating near 90 W, the largest driving power tested. The jet response as determined by penetration and mixing was optimum at a Strouhal number of 0.27. Overall, pulsating the jet flow significantly improved the jet mixing processes in a controllable manner.

Copyright © 1992 by The American Society of Mechanical Engineers
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