空间CO_2羽流压力场的数值计算和实验研究

Numerical and Experimental Investigations of Carbon Dioxide Nozzle Plume Flow in Space Environment

要解决空间羽流污染问题,首先必须精确掌握羽流场的特征。为此,在真空深冷背景环境下进行了CO2气体模拟发动机羽流压力场的数值计算和实验研究。采用经典的计算流体动力学(CFD)和直接模拟MonteCarlo(DSMC)相结合的方法进行羽流场的数值模拟。试验模拟空间高度在100公里以上,在整个测试过程真空舱内压力维持在10-3Pa量级,冷阱温度为93±5K。计算结果与测试数据吻合较好,表明文中计算方法和物理模型可以准确描述真空深冷空间环境下的羽流场特征。

In order to solve the plume contamination problem,first of all,the character of the plume flow field must be known accurately.Experimental and numerical investigations are performed for the carbon dioxide plume flows expansion from a simulated small thruster into high-vacuum and cryogenic conditions.The computational fluid dynamics(CFD) method and the direct simulation Monte Carlo(DSMC) method are combined to solve this problem.The experimental measurements were conducted under the simulated altitude which ...