论文部分内容阅读
为了优化20cm离子推力器放电室内部推进剂供气方式,研究了在不发生气体放电时,推力器阳极和主阴极供气接口处的流体速度和压强,并以此开展推力器放电室内部的流场计算。结果表明:采用单阳极供气管方式,阳极出口处压强为4~158Pa,气流出口速度为0.1~47m/s;阴极小孔出口处的压强约为33.1Pa,出口速度约为12m/s;考虑真空系统的返流作用时,单阳极供气管方式下放电室内部压强为0.001~0.4Pa,大部分区域Xe原子数密度为(0.2~3)×1018/m3,在靠近栅极的部分区域数密度达到9×1019/m3左右;在增加阳极组件的供气管数量后,阳极的气体出口速度为18~40m/s,放电室压强为0.03~0.1Pa,大部分区域Xe原子数密度为(0.72~2.4)×1019/m3,靠近阳极与主阴极进气端的小部分区域原子数密度约2×1017/m3,且放电室内部原子密度整体分布较为均匀。
In order to optimize the gas supply of the propellant in the discharge chamber of a 20 cm ion thruster, the velocity and pressure of the fluid at the anode and main cathode gas supply junctions in the absence of gas discharge were studied. Flow field calculation. The results show that the pressure at the anode outlet is 4 ~ 158Pa and the outlet velocity is 0.1 ~ 47m / s at the anode outlet. The pressure at the outlet of the cathode orifice is about 33.1Pa and the outlet velocity is about 12m / s. Considering In the case of the backflow of the vacuum system, the pressure inside the discharge chamber under the single anode gas supply system is 0.001-0.4 Pa, and the density of Xe atoms in most areas is (0.2-3) x 1018 / m3. In the partial area near the grid The density of the anode reaches about 9 × 1019 / m3. After increasing the number of gas supply pipes for the anode assembly, the anode gas outlet velocity is 18-40 m / s and the discharge chamber pressure is 0.03-0.1 Pa. The Xe atomic number density in most areas is (0.72 ~ 2.4) × 1019 / m3. The atomic density near a small part of the inlet end of the anode and main cathode is about 2 × 1017 / m3, and the atomic density distribution inside the discharge chamber is more uniform.