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 blunt cone is computed at a free-stream Mach-number of 15.

The rope-like Watch 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 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 Computer Data 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.