基于分子运动模拟的微喷管流体流动

深入研究微喷管内流场性能有助于微推进系统的优化设计.在高克努森数条件下,运用直接模拟蒙特卡罗方法模拟微喷管流动过程,对不同入口温度下的拉伐尔喷管流场进行二维数值模拟,模拟结果表明随着入口流体温度的升高,由于黏性力的增强,微喷管的推力减小而比冲增大.对微喷管的三维数值模拟表明,推力效率随着喷管蚀刻深度的减少而降低,微喷管蚀刻深度的增加将使三维壁面边界的影响降低. 

Micronozzle flow based on simulation of molecule movement

Study on micro-nozzle flow field performance contributes to the optimization design of micro-propulsion system. In high Knudsen number conditions, a Direct Simulation Monte Carlo method was employed in two-dimensional numerical simulation of the flow field within a Laval micro-nozzle under different inlet temperatures, results show that along with the increase of fluid temperature at the entrance, as the adhesive strength increase, micro-nozzle thrust would reduce and specific impulse would increase. Three-dimensional numerical simulation of micro-nozzle shows that thrust efficiency decrease along with the etching depth and as it etching deeper, influences of the 3-dimensional boundary wall will reduce.