基于壁面吹气的高超声速湍流边界层减阻降热

doi:10.7527/S1000-6893.2026.33473

Abstract

Abstract:

Hypersonic vehicles are subjected to severe aerodynamic drag and thermal loads during practical flight. To address the issues of high skin-friction drag and intense aerodynamic heating under hypersonic turbulent boundary layer conditions， Large Eddy Simulation （LES） is performed to investigate the drag-and heat-reduction effects of wall micro-blowing through small pores on a Mach number of 6 flat-plate turbulent boundary layer. By comparing smooth-wall and porous-wall configurations， the streamwise distributions of the skin-friction coefficient and wall temperature are analyzed. The results show that wall micro-blowing can simultaneously reduce skin-friction drag and wall thermal load， with the maximum local drag-reduction and heat-reduction rates reaching 17.8% and 7.6%， respectively.Further analysis of the flow-control mechanisms reveals that micro-blowing lifts the mean velocity profile of the turbulent boundary layer， redistributes near-wall low-speed fluid toward the outer region， and is accompanied by enhanced streamwise velocity fluctuations and shear Reynolds stress. Turbulence statistics indicate that micro-blowing intensifies the intermittency of near-wall turbulence， increases the occurrence probability of ejection events， and strengthens the outward transport of low-momentum fluid， which contributes to drag reduction while effectively alleviating wall heat load. These results demonstrate that micro-blowing through small pores has promising potential for simultaneous drag and heat reduction in hypersonic turbulent boundary layers.

Key words: hypersonic flow, micro-blowing, turbulent boundary layer, drag reduction, heat reduction

CLC Number:

V211.3

Jinhui CHEN, Wanting LIU, Zhiyuan LI, Haoyi CAI, Jie WU. Drag and heat reduction in a hypersonic turbulent boundary layer via wall blowing[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(13): 533473.

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网格参数	数值
计算域大小（L_x ×L_z ×L_y ）/mm	1 050×200×24
网格点数（N_x ×N_z ×N_y ）	2 500×100×160
网格分辨率（∆x⁺ ×∆z⁺ ×∆y⁺ ）	6.40×0.48×4.00
自由来流马赫数Ma_∞	6.0
单位雷诺数Re_∞ /（10⁷ m^-1）	1.1
静温T_∞ /K	52.44
静压P_∞ /Pa	633.361

Drag and heat reduction in a hypersonic turbulent boundary layer via wall blowing

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