Volume 9, 2017Progress in Flight Physics
|435 - 450
|Stability, transition, and turbulence
|20 June 2017
Evolution of a wave packet to turbulent spot in a boundary layer at high speeds
Khristianovich Institute of Theoretical and Applied Mechanics Siberian Branch of the Russian Academy of Sciences 4/1 Institutskaya Str., Novosibirsk 630090, Russia
Hypersonic boundary layer stability and transition were studied experimentally for the test case of 7 degree half-angle cone with various nose bluntness. The experiments were performed for M = 6. Wall pressure pulsations were recorded synchronously with the high-speed schlieren. The combined data processing algorithm for coupling of unsteady pressure sensors with high-speed schlieren images was proposed. Analysis of the wall pressure pulsations evolution reveals that the turbulent spot may arise in different ways. It was found that for the blunted model, the role of the second mode in origination of the turbulent spot is more evident.
© The Authors, published by EDP Sciences, 2017
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