In order to improve the performance of the shock vectoring nozzle, the thrust vectoring performance was study when the different gas injecting the nozzle. The complex inner flowfield of vectoring nozzle was numerically simulated by solving the Favre averaged three-dimension Navier-Stokes equations, using three-order precision AUSM+ scheme and k-ω SST two equations turbulence model. The helium, nitrogen and carton dioxide were selected as the secondary gas, and the vector angle and thrust ratio were computed for different jet angle and SPR. Results indicated the vector angle and thrust ratio are approximately equal, but the consumed mass of the secondary gas significantly increases with the molecular weight increasing when the same vector angles are achieved.
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