Oblique-mode breakdown in hypersonic and high-enthalpy boundary layers over a blunt cone

Oblique-mode breakdown in hypersonic and high-enthalpy boundary layers over a blunt cone

Blog Article

Abstract The nonlinear analyses of the hypersonic and high-enthalpy boundary-layer transition had received little attention compared with the widely-studied linear instabilities.In this work, the oblique-mode breakdown, as one of the most available transition mechanisms, is studied using the nonlinear parabolized stability equations (NPSE) with consideration of the thermal-chemical non-equilibrium effects.The flow over a Dresses blunt cone is computed at a free-stream Mach-number of 15.The rope-like structures and the spontaneous radiation of sound waves are observed in the schlieren-like picture.

It is also illustrated that the disturbances of the species mass and vibrational temperature near the wall are mainly generated Matching Shirts by the product term of the wall-normal velocity disturbance and the mean-flow gradient.In comparison to the CPG flow, the TCNE effects destabilize the second mode and push upstream the N factor envelope.The higher growth rate of the oblique wave leads to stronger growth of the streamwise vortices and harmonic waves.