Study of a Mixing Layer Formed by a Supersonic Main Stream of Air and a Co-Flowing Supersonic Helium Jet |
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Authors: | SL Gai A Tarnopolsky AJ Riley |
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Institution: | (1) School of Aerospace & Mechanical Engineering, University College, UNSW, The Australian Defence Force Academy, Campbell, ACT, 2600, Australia |
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Abstract: | The development of large-scale organised motions in a compressible mixing layer is studied experimentally using holographic
interferometry, pressure and turbulence measurements. The mixing layer was formed behind the base of a parallel strut with
a Mach 2 air main stream and a co-flowing two-dimensional slot jet (aspect ratio = 45) of helium at a Mach number of 1.2.
The mixing layer exhibited highly organised vortical structures which were elongated and inclined approximately 45–50° to
the flow direction. The mixing layer showed a linear growth and the mean velocity data indicated self-similar behaviour at
sufficiently downstream distances. The results have shown that the thickness of the primary boundary layer has a strong influence
on the growth and structure of the mixing layer.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | large-scale structures mixing layer supersonic |
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