Experimental investigation of instability of convecting local high- shear layer

Abstract eng:
To obtain a better understanding of the mechanism of wave breakdown into high-frequency hairpin eddies (which was identified as appearance of high-frequency spikes in the waveform of velocity fluctuation) in boundary-layer transition initially caused by the growth of Tollmien-Schlichting waves, development of pulse-like disturbances superposed on a convecting three-dimensional local high-shear layer artificially generated in laminar boundary layer was examined experimentally. In the flow immediately prior to the appearance of high-frequency spike, the group velocity of a wave-packet originating from the pulse disturbance was found to be almost equal to the convection velocity of the high-shear layer. This caused the disturbance to continue growing on the high-shear layer with strong frequency-selectivity, just like in an absolutely unstable flow.

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