螺旋通道磁流体推进器壁面脉动压力的数值研究  

Numerical study on wall pressure fluctuations of a helical channel MHD thruster

作　　者：赵凌志[1,2] 彭爱武[1] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《水动力学研究与进展（A辑）》2014年第3期310-316,共7页Chinese Journal of Hydrodynamics

摘　　要：该文采用电势法和大涡模拟理论数值分析了2 m水柱压升螺旋通道磁流体推进器设计工况的全三维流场和脉动压力,探讨了电磁场作用下螺旋通道内部压力脉动的位置、强度、频率特征、产生原因以及减弱方法。数值分析结果表明:(1)电磁场作用下,螺旋通道的压力脉动沿周向基本均匀分布,沿轴向逐渐增大,整流段的压力脉动大于导流段;(2)螺旋叶片、整流器叶片以及外电极和整流器外管壁是产生压力脉动的主要区域;(3)优化整流器的几何结构、特别是叶片的型线,改善整流段及相邻螺旋叶片出口的流场分布,可降低这些区域的脉动压力,从而改进螺旋通道磁流体推进器的振动噪声性能。The full 3-D flow field and wall pressure fluctuations of the design condition of a helical-channel MHD thruster with a 2 m pressure rise is analyzed numerically using the combination of MHD potential method and large eddy simulation theory. The location, intensity, frequency characteristics, producing reason and weakening method of the wall pressure fluctuations are investigated. The results show that： （1） the wall pressure fluctuation distributes almost evenly in the circumferential direction and increases along the axial direction under the presentation of the electromagnetic field, and the wall pressure fluctuation in the rectifier＇s region is much larger than that in the flow guide＇s region; （2） the helical vane, vanes of rectifier, the outer electrode and pipe wall of the rectifier are main locations of producing the wall pressure fluctuation; （3） optimizing the rectifier, especially its vane, and improving the flow field of the rectifier region and its adjacent domain can keep the wall pressure fluctuation down and improve the vibration and noise characteristics of a helical-channel MHD thruster greatly.

关 键 词：螺旋通道 磁流体推进 脉动压力 大涡模拟 

分 类 号：O361.5[理学—流体力学]