吸气式电推进中的气体捕集系统的设计分析

针对吸气式电推进系统中的气体捕集系统，提出了一种能够准确计算气体捕集率的理论模型，并以此为基础开展了气体捕集系统的优化设计。首先，通过分析几类代表性气体捕集系统的捕集特点，提取了影响气体捕集率的关键参数。然后，通过分析进气道内气体分子的微观行为，推导得到了气体捕集率的理论公式，获得了无量纲管长、末端净透射率等关键参数对气体捕集率的影响规律。最后，利用理论模型，对实际飞行条件下的气体捕集系统开展了优化设计。结果表明，当末端净透射率给定时气体捕集率随无量纲管长先增后减，且最大捕集率与末端净透射率正相关。通过使用涡轮分子泵提升末端净透射率并对无量纲管长进行优化，实际飞行条件下的气体捕集率可以达到50%以上。

Design and Analysis of an Air Intake System for Air Breathing Electric Propulsion

Air breathing electric propulsion is a very promising propulsion technology for ultra low orbit satellite, and one of the keys is to efficiently collect atmospheric molecules as propellant. Several representative air intake systems are compared and analyzed, which helps to summarize the basic principles to increase collection efficiency. The common physical problems in air intake systems are then investigated through theoretical analysis and numerical simulation, and the influence of key parameters such as non dimensional tube length and exit transmission probability on collection efficiency is obtained. It is found that when the non dimensional tube length increases the collection efficiency first increases and then decreases, and the highest collection efficiency shows a positive correlation with the exit transmission probability.Based on the analysis,a preliminary design of air intake system is provided for earth orbit at 150 km and the optimized collection efficiency is over 50%.