Thermo-chemical nonequilibrium effects on the aerothermodynamics of aerobraking vehicles
Thermo-chemical nonequilibrium effects on the aerothermodynamics of aerobraking vehicles
复制标题
热化学非平衡对空气制动车辆空气热力学的影响
DOI：
10.2514/3.26369
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
D. Olynick
中科院分区：
文献类型：
--
作者：
B. Hassan;G. Candler;D. Olynick
提出了一种三维计算流体动力学算法，研究了化学和热平衡对钝体空气动力学的影响。完美气体和五种空气反应气体模型都被用来计算阿波罗指令舱上空的气流。假定反应的气体-空气混合物受平移-旋转温度和振动温度控制。Navier-Stokes计算结果与阿波罗任务的风洞和飞行空气动力学数据进行了比较。研究了化学反应和振动激励对升阻比和纵倾角的影响。结果表明，与非反应气体风洞模拟结果相比，考虑实际气体效应后的纵倾角和L/D较低。反应气体数值计算结果与无人驾驶阿波罗AS-202任务的飞行数据一致，而完美气体计算结果与外推的飞行前风洞结果一致。
A three-dimensional computational fluid dynamics algorithm is developed to study the effect of chemical and thermal nonequilibrium on blunt body aerodynamics. Both perfect gas and five species air reacting gas models are used to compute the flow over the Apollo command module. The reacting gas air mixture is assumed to be governed by a translational-rotational temperature and a vibrational temperature. The Navier-Stokes computations are compared to wind-tunnel and flight-aerodynamic data from the Apollo missions. The effects of chemical reaction and vibrational excitation on lift-to-drag ratio and trim angle are investigated. It is shown that including real gas effects results in a lower trim angle and L/D than predicted by nonreacting gas wind-tunnel simulations. The reacting gas numerical results are consistent with flight data from the unmanned Apollo AS-202 mission, whereas the perfect gas computations agree with the extrapolated preflight wind-tunnel results.