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针对火星稀薄大气环境进入器气动特性问题,以类火星科学实验室外形为例,计算分析火星稀薄大气真实气体效应对气动特性的影响,给出火星高空稀薄环境下的气动特性规律。研究发现,随着飞行高度的增加,稀薄度增加,激波脱体距离、激波厚度增大,激波强度减弱,明显的激波结构逐渐消失,流场等值线更趋于圆弧状分布;真实气体效应使得迎风面压缩及背风面膨胀增强,轴向力、法向力及顶点力矩系数等预测结果与完全气体模型预测结果相比绝对值偏大;随着稀薄度增大,轴向力、法向力及顶点力矩系数等绝对值增大,在同样的迎角下,随稀薄度的增加,纵向压心前移,进入器的静稳定性变差。
Aiming at the aerodynamic characteristics of the Martens leapfrog environment, taking the shape of the Mars-like science laboratory as an example, the influence of the real gas effect on the levitation of Mars on the aerodynamic characteristics is analyzed and calculated. The aerodynamic characteristics of Martian levitation at high altitude are given. The results show that as the flight altitude increases, the thinning degree increases, the shock off-body distance increases, the shock thickness increases, the shock intensity decreases, and the obvious shock structure disappears gradually, and the flow field contours become more arcuate The real gas effect makes the windward compression and the expansion of the leeward surface stronger. The predicted results of the axial force, the normal force and the vertex torque coefficient are larger than those predicted by the complete gas model. As the thinning increases, the axial To the force, the normal force and the vertex torque coefficient and other absolute value increases, with the same angle of attack, with the increase of the thinning, the longitudinal compression of the heart forward, the static stability of the importer worse.