Pavel V. Chuvakhov, Alexander V. Fedorov

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_1440832

Atmospheric particulates may be a major source of boundary layer instabilities leading to laminarturbulent transition on aerodynamically smooth bodies flying at supersonic speeds. Particulates penetrating into the boundary-layer flow can excite wavepackets of the first and/or second mode instability. These disturbances grow downstream, reach the threshold amplitude and ultimately break down to turbulent spots. A numerical model is developed to simulate excitation of unstable wavepackets by spherical solid particulates. As an example, computations are carried out for a 14° half-angle sharp wedge flying at altitude 20 km, Mach number 4 and zero angle of attack. The numerical results agree satisfactory with the theory developed by Fedorov [1]. The numerical model opens up an opportunity to investigate receptivity to particulates for practical supersonic and hypersonic configurations such as blunt bodies of revolution and wings.

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In Categories: Boundary Layer Control, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2018, Hypersonic Aerodynamics
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