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On the instability of hypersonic flow past a wedge. (English) Zbl 0698.76073

Summary: The instability of a compressible flow past a wedge is investigated in the hypersonic limit. Particular attention is paid to Tollmien- Schlichting waves governed by triple-deck theory though some discussion of inviscid modes is given. It is shown that the attached shock can have a significant effect on the growth rates of Tollmien-Schlichting waves. Moreover, the presence of the shock allows for more than one unstable Tollmien-Schlichting wave. Indeed an infinite discrete spectrum of unstable waves is induced by the shock, but these modes are unstable over relatively small but high frequency ranges. The shock is shown to have little effect on the inviscid modes considered by previous authors and an asymptotic description of inviscid modes in the hypersonic limit is given.

MSC:

76K05 Hypersonic flows
76N15 Gas dynamics (general theory)
76E99 Hydrodynamic stability
76M99 Basic methods in fluid mechanics
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