火星进入器作强迫震荡运动壁面脉动压力数值模拟

为研究超声速阶段进入器作强迫震荡运动对壁面脉动压力环境的影响规律，本文耦合进入器刚体运动方程与流体力学方程，采用动网格技术，对火星进入器模型开展非定常数值模拟，获取壁面不同位置处的脉动压力信息。研究表明：在超声速阶段，进入器作强迫震荡运动诱导的脉动压力远大于进入器保持相对静止时仅由非定常流动诱导的脉动压力。来流马赫数为1.2时，进入器作强迫震荡运动对脱体激波影响较小，脱体激波强度较弱且形态变化较小，攻角的震荡导致同一测点距离脱体激波的位置发生周期性改变，舱体迎风面及配平翼迎风面的脉动压力环境主要受攻角变化的影响；来流马赫数为3时，进入器作强迫震荡运动对脱体激波的影响较大，脱体激波震荡剧烈，诱导舱体迎风面及配平翼迎风面产生极其恶劣的脉动压力环境，功率谱分析表明激波震荡诱导的脉动压力能量主要集中在30 Hz左右。

Numerical Simulation of Fluctuating Pressure Environment of Mars Entry Capsule under Forced Oscillation

Three-dimensional unsteady numerical simulations are performed to investigate the fluctuating pressure environment around a Mars entry capsule under the forced oscillation. The forced oscillation of the capsule is simulated numerically by coupling and solving the unsteady compressible Navier-Stokes equations and Euler equation of the rigid-body dynamics. Based on the dynamic-mesh, the fluctuating pressure characteristics at different wall locations are obtained and analyzed. The research shows that the forced oscillation of the capsule aggravates the fluctuating pressure during the supersonic entry. When the inflow Mach number is 1.2, the forced oscillation of the capsule has little effect on the detached shock. The detached shock intensity is weak and the shape change is small, but the distance between the detached shock and the point alters periodically with the angle of attack changed. The fluctuating pressure on the windward side of the capsule is mainly affected by the angle of attack. When the inflow Mach number is 3, the detached shock oscillates intensely, leading to a severe fluctuating pressure environment around the capsule base and the windward of the trim-flap, and the spectrum of the fluctuating energy induced by the shock oscillation is concentrated at around 30 Hz.