| 陈伟芳,王全利,尹乐.微喷管流动粒子仿真与Navier-Stokes数值模拟比较研究[J].计算力学学报,2005,22(6):677~680 |
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| 微喷管流动粒子仿真与Navier-Stokes数值模拟比较研究 |
| Study on comparison of particle imitation and mavier-stokes equations numerical simulation for flow in micro-nozzle |
| 修订日期：2003-12-31 |
| DOI：10.7511/jslx20056131 |
| 中文关键词: 微喷管 DSMC方法 Navier—Stokes方程 流动 |
| 英文关键词:micro-nozzle,DSMC method,Navier-Stokes equations,flow, |
| 基金项目:国家自然科学基金(19902021)资助项目 |
| 陈伟芳 王全利 尹乐 |
| 国防科技大学航天与材料工程学院,湖南长沙410073 |
| 摘要点击次数: 1617 |
| 全文下载次数: 11 |
| 中文摘要: |
| 运用DSMC（Direct Simulation Monte—Carlo）方法从分子运动论层次对大膨胀比、喉部转角为尖角的微喷管流动现象进行模拟，考察来流总压对喷管性能的影响，并与Navier—Stokes方程运算结果、实验结果进行比较。研究表明：在模拟微型喷管的流动现象时，DSMC方法比N—S方程更加适用。 |
| 英文摘要: |
| At present,micro-spacecrafts are developed.Micro-nozzles are very important in propulsion systems of micro-spacecrafts.So the farther study on micro-nozzles is available.Methods for creating thrusters with very low thrust using micro-nozzles have been actively developed recently.These conditions indicate that low-density effects will dominate the fluid mechanics.The flow in such nozzles is characterized by low Reynolds numbers and,as a consequence,by high viscous losses.Usually there are two methods to simulate the flow in micro-nozzles,DSMC method and Navier-Stokes equations.In this paper,DSMC(Direct Simulation Monte-Carlo)calculations for flow in micro-nozzle with great expand ratio and sharp corner were conducted on molecular-based models.The influence of the total pressure of inlet on the performance of the nozzle is also discussed.The results of DSMC method are compared with the results of Navier-Stokes equations and experiment.The study indicates that DSMC method is better than Navier-Stokes equations when simulating the flows in micro-nozzles. |
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