Special Issue on Advances on Numerical Methods for Engineering Problems; Guest Editors: Guiyong Zhang and Xiangyang CuiNo Access

Surface Slip Effect on Thermal Environment of Hypersonic Non-Equilibrium Flows

Wenbo Miao

China Academy of Aerospace Aerodynamics, P. O. Box 7201-16, Beijing 100074, China

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Xiaoli Cheng

China Academy of Aerospace Aerodynamics, P. O. Box 7201-16, Beijing 100074, China

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Bangcheng Ai

China Academy of Aerospace Aerodynamics, P. O. Box 7201-16, Beijing 100074, China

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, and

Yonghui Dong

China Academy of Aerospace Aerodynamics, P. O. Box 7201-16, Beijing 100074, China

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https://doi.org/10.1142/S0219876215400083Cited by:1 (Source: Crossref)

Abstract

Boundary slip effect caused by low gas density has an important influence on the thermal environment of the vehicles. Numerical studies on the boundary slip effect and accommodation for moment and energy have been carried out in this paper. The simulations considering slip boundary and surface catalysis are validated with Arc-jet test data. Mechanism and rules of impact on surface heat flux by different boundary slip level (Knudsen number from 0.0028 to 0.05) has been investigated in typical hypersonic flow conditions. The results show that mechanisms of boundary slip effect on mass diffusion heat flux and convective heat flux are different; slip boundary diminishes the convective heat, whereas enhances the mass diffusion heat flux. Smaller moment and energy accommodation coefficient is equivalent to more rarefaction. As Knudsen number goes up, the influences of accommodation on heatflux are enhanced, it mainly affects the convective heat flux.

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