Flow characteristics of supersonic gas passing through a circular micro-channel under different inflow conditions

论文摘要

Gas flow in a micro-channel usually has a high Knudsen number. The predominant predictive tool for such a microflow is the direct simulation Monte Carlo（DSMC） method, which is used in this paper to investigate primary flow properties of supersonic gas in a circular micro-channel for different inflow conditions, such as free stream at different altitudes, with different incoming Mach numbers, and with different angles of attack. Simulation results indicate that the altitude and free stream incoming Mach number have a significant effect on the whole micro-channel flow field, whereas the angle of attack mainly affects the entrance part of micro-channel flow field. The fundamental mechanism behind the simulation results is also presented. With the increase of altitude, thr free stream would be partly prevented from entering into micro-channel.Meanwhile, the gas flow in micro-channel is decelerated, and the increase in the angle of attack also decelerates the gas flow. In contrast, gas flow in micro-channel is accelerated as free stream incoming Mach number increases. A noteworthy finding is that the rarefaction effects can become very dominant when the free stream incoming Mach number is low. In other words, a free stream with a larger incoming velocity is able to reduce the influence of the rarefaction effects on gas flow in the micro-channel.

论文目录

• 1.Introduction
• 2. DSMC method and code validation
•   2.1. DSMC introduction
•   2.2. Validation of the DSMC code
• 3. Description of simulation cases
• 4. Results and discussion
•   4.1. Effect of altitude on micro-channel gas flow
•   4.2. Effect of incoming Mach number on micro-channel gas flow
•   4.3. Effect of angle of attack on micro-channel gas flow
• 5. Conclusions

文章来源

类型: 期刊论文

作者: 郭广明,罗琴,朱林,边义祥

来源: Chinese Physics B 2019年06期

年度: 2019

分类: 基础科学

专业: 力学

单位: College of Mechanical Engineering, Yangzhou University,College of Information Engineering, Yangzhou University

基金: Project supported by the National Natural Science Foundation of China(Grant No.11802264),the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20180896)

分类号: O35

页码: 270-283

总页数: 14

文件大小: 1588K

下载量: 19