Secondary instability of high-speed flows and the influence of wall cooling and suctionThe periodic streamwise modulation of the supersonic and hypersonic boundary layers by a two-dimensional first-mode or second-mode wave makes the resulting base flow susceptible to a broad-band spanwise-periodic three-dimensional type of instability. The principal parametric resonance of this instability (subharmonic) has been analyzed using Floquet theory. The effect of Mach number and the effectiveness of wall cooling or wall suction in controlling the onset, the growth rate, and the vortical structure of the subharmonic secondary instability are assessed for both a first-mode and a second-mode primary wave.
Document ID
19910058949
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
El-Hady, Nabil M. (Analytical Services and Materials, Inc. Hampton, VA, United States)