Numerical Simulation of Graphite Ablation Induced Outgassing Effects on Hypersonic Boundary Layer Receptivity over a Cone Frustum

摘要

A new thermochemical nonequilibrium linear stability theory code with a gas phase model including multiple carbon species is developed and validated. A high-order shock-fitting method with thermochemical nonequilibrium and surface chemistry boundary conditions for graphite ablation along with the new linear stability theory code are used to study hypersonic boundary layer receptivity and stability for a 7° half angle blunt cone at Mach 15.99. The real gas results are compared with ideal gas computations that set their wall temperature and wall blowing from the real gas simulation. Weak planar fast acoustic waves are used to perturb the steady base flow. A 525 kHz disturbance was found to be unstable for the real gas simulation and stable for both ideal gas simulations. The second mode for the 525 kHz disturbance becomes the dominant instability mode on the cone frustum for the thermochemical nonequilibrium simulation.