Compressibility effects on large structures in free shear flows
Samimy, M. ; Reeder, M. F. ; Elliott, G. S.
New York, NY : American Institute of Physics (AIP)
Published 1992
New York, NY : American Institute of Physics (AIP)
Published 1992
| ISSN: |
1089-7666
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
Space-time correlations were used to study compressibility effects on large structures in mixing layers. Two high Reynolds number mixing layers with Mc=0.51 (case 1) and 0.86 (case 2) were studied. The results indicate that the structures in case 1 are similar to those in the subsonic case, but less organized. The structures in case 2 are highly three dimensional, with a good spatial but a poor temporal organization. The streamwise correlations showed a decay rate 4 to 5 times greater for case 2 relative to case 1. While the spanwise correlations for case 1 showed trends similar to incompressible mixing layers, the behavior of case 2 was very different. The pressure fluctuations in the fully developed region of case 2 displayed significant rms variation in the spanwise direction with a well-defined pattern. Based on these measurements, the structures in case 2 seem to be of a horseshoe type, transversely spanning the mixing layer with the head in the low-speed side and the legs inclined in both the x-y and the x-z planes.
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| Type of Medium: |
Electronic Resource
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| URL: |