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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2018, Vol. 39 ›› Issue (3): 121588-121588.doi: 10.7527/S1000-6893.2017.121588

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Computational analysis of influence of differences in local catalytic properties on aero-thermal environment

DING Mingsong, DONG Weizhong, GAO Tiesuo, JIANG Tao, LIU Qingzong   

  1. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2017-07-06 Revised:2017-08-31 Online:2018-03-15 Published:2017-08-31

Abstract: The influence of aero-thermal environment of hypersonic vehicle because of high temperature air non-equilibrium effect and the catalytic effect has been one of the critical problems in aero-thermal environment prediction and hypersonic vehicle design. Considering the chemical reaction of the high temperature air, vibrational excitation of gas molecules, non-equilibrium effects in the flow and the catalytic effect on the vehicle surface, numerical simulation method and the corresponding computational codes are developed for the aero-thermal environment of thermo-chemical non-equilibrium flow by solving 3D thermochemical non-equilibrium Navier-Stokes equations and the balance between the mass and energy on the vehicle surface. The numerical results of the typical examples agree well with foreign reference data and flight data. On this basis, the influence of differences in local catalytic properties on the aero-thermal environment of the hypersonic vehicle under different conditions is studied. These results show that the differences in local catalytic properties can obviously lead to the jump of the heat flux. When the difference between local catalytic properties is lager, the local heat flux is far higher than the result under the fully catalytic wall condition of the whole vehicle surface, and the simplified approach of using the heat flux under the whole vehicle surface Fully Catalytic Wall (FCW) and Non-Catalytic Wall (NCW) conditions as its bounds for the actual fight is not advisable.

Key words: aero-thermal environment, high temperature gas, non-equilibrium effect, catalytic effect, numerical simulation

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