再入飞行器脉动压力环境特性分析

文章通过数值求解球头单锥飞行器绕流流场结构，利用均方根脉动压力系数、功率谱密度和窄带空间相关系数3个统计参数分析飞行器湍流附面层脉动压力环境特性，为飞行器结构改进设计提供依据，并为飞行器环境条件加载位置、加载密度等参数的确定提供参考。研究结果表明，脉动压力强度沿流向逐渐减小，压力脉动能量主要集中在比湍流附面层脉动特征频率小的频域内；脉动压力空间相关性沿流向逐渐增强，其衰减能力随间隔距离的减小而增加，符合脉动压力的传播和衰减特征。

The characteristics of the fluctuating pressure environment for a re-entry vehicle

The flow field around a hypersonic spherical-conic aircraft is numerically simulated to obtain the characteristics of the fluctuating pressure environment within the turbulent boundary flow, as described by three statistical parameters in this paper. The results indicate that the intensity of the fluctuating pressure decreases from the upstream to the downstream of the aircraft flow field, and the excitation energy of the fluctuating pressure is limited within a frequency band lower than the specific frequency of the turbulence boundary. The longitudinal and transverse correlation of the fluctuating pressure flow field is increased in the flow direction, and the attenuation of the fluctuating pressure is enhanced as the spatial distance is decreased, as is consistent with the transmission and attenuation characteristics of fluctuating pressure. The investigation on the characteristics of the fluctuating pressure environment around aircraft can contribute to confirm the payload parameters in environmental compatibility researches for the aircraft, and to provide a design basis for aircraft structure improvement.