Study of a mixing layer formed by a supersonic main stream of air and a co-flowing supersonic helium jet

Study of a mixing layer formed by a supersonic main stream of air and a co-flowing supersonic helium jet

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-dimensi...

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Veröffentlicht in:Flow, turbulence and combustion turbulence and combustion, 2002-01, Vol.68 (3), p.195-226
Hauptverfasser: Gai, S L, Tarnopolsky, A, Riley, A J
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Tarnopolsky, A
Riley, A J
description 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 45-50DG 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.
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title Study of a mixing layer formed by a supersonic main stream of air and a co-flowing supersonic helium jet
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