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Hypersonic boundary layers grow more rapidly compared to subsonic and supersonic boundary layers.(a) True(b) FalseI had been asked this question in semester exam.Origin of the question is Hypersonic Flow topic in division Transonic and Hypersonic Flows of Aerodynamics

Answer»

The correct choice is (a) True

The best I can explain: The pressure inside the boundary layer remains constant (in the normal DIRECTION), but the TEMPERATURE increases due to viscous dissipation. Thus, from equation of state, there is a decrease in density making it IMPORTANT to have a larger boundary layer thickness to pass the MASS flow through the boundary layer. Due to this reason, the hypersonic boundary layer thickness grows MUCH more rapidly compared to other flow regimes.



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