一种用于吸气式电推进的新型吸气装置研究

A New Structural Intake for Atmosphere-Breathing Electric Propulsion

为提升吸气式电推进吸气装置的气体收集率,本文设计一种新结构的吸气装置,即附有近壁阻翼结构的抛物型吸气管。以单元粒子/直接蒙特卡罗碰撞模型(PIC/DSMC)对传统抛物型和新型结构的吸气管进行流场参数分布的数值计算。计算结果表明,近壁阻翼对于壁面附近返流有较强的阻碍作用,可令返流粒子数量减少,气体收集率可提高2%~10%不等;近壁阻翼的位置和长度对气体收集率有较大影响,主要表现在阻翼对来流阻挡作用和对返流阻挡作用两者的占比程度,在本文工况中(轨道高度为180km,适应系数σ=0.3),气体收集率的最优值为47.3%。

In order to improve the gas collection efficiency of the intake for atmosphere-breathing electric propulsion,a new structural parabolic intake is proposed,namely the parabolic intake with a near-wall damper wing.A numerical calculation based on the Particle in Cell/Direct Simulated Monte-Carlo Collision(PIC/DSMC)Model has been employed to solve the fluid field parameters of the primitive structural intake and the new structural intakes.The calculation results showed that the near-wall damper wing had a strong hindering effect on the near-wall backflow,and the number of backflow particles could be reduced and the gas collection efficiency could be raised by 2%to 10%.The position and length of the near-wall damper wing had a great effect on the gas collection efficiency,which is mainly manifested in the balance between the incoming flow block and the back⁃flow block.The optimal value of the gas collection efficiency was 47.3%in the present study(the operation condi⁃tion:orbit height is 180km,the accommodation coefficientσ=0.3).