吸气式高超声速飞行器大迎角气动特性分析

doi:10.7527/S1000-6893.2014.0266

Abstract

Abstract:

During the flight of air-breathing hypersonic vehicles, the atmospheric turbulence or other external disturbances may result in high angle of attack conditions. In order to study the aerodynamic performances influenced by high angle of attack, numerical simulations are performed on the flow field of a typical air-breathing hypersonic vehicle. The flow field and aerodynamic characteristics are obtained by solving the Reynolds-averaged Navier-Stokes (RANS) equations using standard k-ε turbulence models. The performances of vehicle, inlet and the all-moving tails are analyzed and explained based on the flow field characteristics especially at high angle of attack. The investigation indicates that there is coupling between aerodynamics and propulsive system. At high angle of attack, aerodynamic parameters exhibit nonlinear characteristics, meanwhile, the lift-to-drag ratio begins to reduce and the longitudinal instability enhances. The inlet has poor performance at high angle of attack, resulting in the decrease of thrust provided by the engine, which is not conducive to the normal operation of the engine. However, on the other hand, the decrease of thrust will reduce the longitudinal instability of the vehicle. In addition, the control efficiency of the all-moving tails reduces and consequently makes trimming difficult.

Key words: air-breathing, hypersonic, numerical simulation, high angle of attack, inlet, tail

CLC Number:

V211.4

LUO Wenli, LI Daochun, XIANG Jinwu. Aerodynamic characteristics analysis of air-breathing hypersonic vehicles at high angle of attack[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(1): 223-231.

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Aerodynamic characteristics analysis of air-breathing hypersonic vehicles at high angle of attack

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