Study on influencing factors of aerothermal characteristics of a quasi-semi cone body

Abstract

Based on the Computational Fluid Dynamics (CFD) approach, an aerothermal calculation model verified by the wind tunnel test is established, and the influences of angle of attack, wall temperature, static temperature of the incoming flow, wall temperature ratio, Mach number and Reynolds number of incoming flow on the aerothermal characteristics of the forebody are analyzed in detail. The obtained results indicate that the relationship between the surface heat flux and the angle of attack is approximately linear, as well as the relationship between the heat flux and the wall temperature. However, the relationship between the heat flux and the static temperature of the incoming flow is nonlinear. The wall temperature ratio of zero point of heat flux in the same state is basically the same, and this is independent of the static temperature of the incoming heat flux. The function relationship between the near wall fluid temperature and the wall temperature is established, and the predicted results are in good agreement with the function curve. Based on the temperature function of the near wall fluid, the heat flux conversion formula of different static temperatures are established to form the heat flux estimation approach, and the estimated value is in good agreement with the predicted results. The heat flux distributions of the forebody with different Mach numbers are basically the same, and the heat flux increases approximately linearly with the increase of Mach number. The heat flux distribution law of the forebody with different Reynolds numbers is basically the same, and the heat flux increases with the increase of Reynolds number. Besides, the position of the maximum of the fluid temperature in the boundary layer is close to the wall with the increase of the Reynolds number.