基于分子运动模拟的微喷管流体流动

基金项目: 黑龙江省博士后基金(LBH-Z08249)

Micronozzle flow based on simulation of molecule movement

1.
Department of Aerospace Engineering, College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
2.
Department of Aerospace Engineering, School of Astronautics, Harbin Institute of Technology, Harbin 150001, China

摘要: 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.
- 微喷管 /
- 蒙特卡罗法 /
- 尺度效应 /
- 附面层 /
- 数值模拟
Abstract: In-depth study on micro-nozzle flow field performance contributes to optimization design of micro-propulsion system.Under high Knudsen number conditions,a direct simulation Monte-Carlo method was employed for two-dimensional numerical simulation of the flow field within a Laval micro-nozzle at different inlet temperatures.The results show that along with the increase of fluid temperature at the entrance,micro-nozzle thrust would reduce and specific impulse would increase as the adhesive strength increase.Three-dimensional numerical simulation of micro-nozzle shows that thrust efficiency would decrease with the declining etching depth,and as the etching depth becomes deeper,the influences of three-dimensional boundary wall would reduce.
- micro-nozzle /
- Monte-Carlo method /
- scale effect /
- boundary layer /
- numerical simulation