Nearfield Evolution of a Longitudinal Vortex Generated by an Inclined Jet in a Turbulent Boundary Layer

[+] Author and Article Information
X. Zhang

Department of Aeronautics and Astronautics, University of Southampton, Southampton, United Kingdom

M. W. Collins

Department of Mechanical Engineering and Aeronautics, City University, London, United Kingdom

J. Fluids Eng 119(4), 934-939 (Dec 01, 1997) (6 pages) doi:10.1115/1.2819520 History: Received December 20, 1996; Revised July 08, 1997; Online January 22, 2008


The nearfield evolution of a longitudinal vortex embedded in a turbulent boundary layer was examined in a wind-tunnel test. The Vortex was produced by an inclined round jet, the diameter of the jet being 0.4δ0.99 . Flow properties were measured at a freestream velocity of 20 m/s using a laser Doppler anemometer. Control parameters are jet skew and pitch angles, and speed ratio. It was observed that a single vortex is generated at x = 10D. The effects of the control parameters on the strength and location of the vortex were examined. For an embedded vortex and favorable velocity distribution, the test results suggested a skew angle of 60 deg, a pitch angle of α = 30 deg, and speed rations of γ = 1.0. The study provided insight into the flow physics and a database.

Copyright © 1997 by The American Society of Mechanical Engineers
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