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Response of a hypersonic blunt cone boundary layer to slow acoustic waves with assessment of various routes of receptivity

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Applied Mathematics and Mechanics(English Edition) 2018年第11期39卷 1643-1660页

作者： Bingbing WAN Jisheng LUO Caihong SU Laboratory for High-Speed Aerodynamics School of Mechanical Engineering Tianjin University

The hypersonic boundary-layer receptivity to slow acoustic waves is investigated for the Mach 6 flow over a 5-degree half-angle blunt cone with the nose radius of 5.08 mm. The plane acoustic wave interacts with the bow shock, and generates all types of disturbances behind the shock, which may take various routes to generate the boundarylayer unstable mode. In this paper, two routes of receptivity are investigated in *** is through the disturbance in the entropy layer. The other is through the slow acoustic wave transmitted downstream the bow shock, which can excite the boundary-layer mode due to the synchronization mechanism. The results show that, for a low frequency slow acoustic wave, the latter route plays a leading role. The entropy-layer instability wave is able to excite the first mode near the neutral point, but its receptivity efficiency is much lower.

关键词： receptivity entropy layer blunt cone hypersonic boundary layer

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On the mechanism by which nose bluntness suppresses second-mode instability

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Theoretical & Applied Mechanics Letters 2020年第4期10卷 230-240页

作者： Armani Batista Arham Amin Khan Joseph Kuehl Department of Mechanical Engineering University of DelawareNewarkDelaware 19716USA

A physical mechanism by which nose bluntness suppresses second-mode instability is *** are 7 degree half-angle straight cones with nose bluntness radii of 0.15 mm, 3.556 mm,5 mm, 9.525 mm, 12.7 mm and 25.4 mm at tunnel conditions relevant to the AFOSR-Notre Dame Large Mach 6 Quiet Tunnel. It is shown that second-mode suppression is achieved via entropy layer modulation of the basic state density gradient. A weakening of the density gradient disrupts the acoustic resonance necessary to sustain second-mode growth. These results are consistent with the thermoacoustic interpretation which posits that second-mode instability can be modeled as thermoacoustic resonance of acoustic energy trapped within an acoustic impedance ***, the generalized inflection point criterion of Lees and Lin is applied to develop a criterion for the existence of second-mode instability based on the strength of the basic state density gradient.

关键词： Second mode instability Hypersonics boundary layer Blunt body paradox entropy layer

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