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稳态螺旋波等离子体推力器中,源室放电获得的一定能量的等离子体经过磁喷管加速产生预定的推力和比冲。为了分析在发散磁场约束下,等离子体的运动受约束磁场和内能变化的影响规律及其推进性能,引入了考虑电子和离子不同响应的二维轴对称数值模型。计算了入口中心磁感应强度B_0为100~500G、电子温度Te0为3.0~10.0e V时等离子体的运动。结果表明,入口等离子体的内能增加,B_0保持100G不变时,其最终膨胀的绝对速度增加,比冲从400s提高到约为580s;内能变化对比冲I_(sp)的影响大于磁感应强度。不考虑等离子体与磁场相互作用情况下,文中计算的磁场范围可以最大限度地将内能转化为等离子体的轴向定向动能;为了提高I_(sp),应适当增加电离段等离子体获得的能量,且可以适当降低对产生约束磁场的电流线圈输入能量要求。
In the steady-state helical-wave plasma thruster, a certain energy plasma obtained from the discharge of the source chamber is accelerated by a magnetic nozzle to generate a predetermined thrust force and a specific impulse. In order to analyze the influence laws of the movement of the plasma under the constraint of the divergent magnetic field and the variation of the internal magnetic energy and its propulsion performance, a two-dimensional axisymmetric numerical model considering different responses of electrons and ions is introduced. The movement of the plasma is calculated when the magnetic flux density B_0 in the entrance center is 100 ~ 500G and the electron temperature Te0 is 3.0 ~ 10.0eV. The results show that the internal energy of the inlet plasma increases. The absolute velocity of the final expansion increases when the B_0 is kept constant at 100G, and the specific impulse increases from 400s to about 580s. The effect of internal energy on the relative impulse I_ (sp) is greater than that of the magnetic flux density . Without considering the interaction between the plasma and the magnetic field, the magnetic field range calculated in this paper can maximize the internal energy into the plasma axial orientation kinetic energy; in order to improve I sp, the energy obtained by ionization plasma should be appropriately increased , And the input energy requirements of the current coil generating the confining magnetic field can be appropriately reduced.