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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Numerical Simulation on Compressible Flow Around Blunt Body With Porous Region Insert Front

Zhenhuan Li
Harbin Institute of Technology, No. 92 West Dazhi Street, Nangang District, Harbin, 150001, China

Xin-Lin Xia
Harbin Institute of Technology

Haifeng Sun
Harbin Institute of Technology, No. 92 West Dazhi Street, Nangang District, Harbin, 150001, China

Qing Ai
School of Energy Science and Engineering, Harbin Institute of Technology

Abstract

This work presents two-dimensional numerical results for supersonic flow around blunt-nosed body with porous spike, which included aerodynamic characteristics of the base body and aero-heating effect acted on the frontal edge. Governing equations for both porous and nonporous region have been developed based on single-domain approach at continuum scale, where the drag of porous region is taken accounted by supplementing momentum source term. The temperature fields of the fluid and solid phases of porous region are obtained by local thermal non-equilibrium model and the radiation transport in porous region is modeled with Rosseland approximation. In order to validate superior passive controlling aerodynamic effect that porous spike acts on the base body, the solid spike (hemispherical nose spike) which has better aerodynamic performance confirmed by literature experiment is selected and compared with porous one. Sensitivity studies are conducted to analyze the effects of geometric parameter (length and radius of spike) on the wave drag of blunted body to select optimal shape of both spikes. Numerical study is performed with two optimal ones under supersonic flow condition (M = 4.85). The numerical results show that porous spike can redistribute frontal incoming flow and attenuate intensity of frontal separation occurred on both sides of the spike. Compared with solid spike, the severity of reattachment pressure is alleviated leading to more wave drag reduction. In addition, corresponding to the pressure distribution of frontal edge, foam spike reduces the aero-heating effect that represented by reattachment point wall heat flux more significantly than solid spike.

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