| Title: |
DSMC Simulation of the Effect of Needle Valve Opening Ratio on the Rarefied Gas Flows inside a Micronozzle with a Large Length-to-Diameter Ratio |
| Authors: |
Xudong Wang, Yong Li, Yong Gao, Chenguang Gao, Weichun Fu |
| Source: |
Aerospace, Vol 10, Iss 2, p 126 (2023) |
| Publisher Information: |
MDPI AG, 2023. |
| Publication Year: |
2023 |
| Collection: |
LCC:Motor vehicles. Aeronautics. Astronautics |
| Subject Terms: |
cold gas micro-nozzle, rarefied flow, DSMC method, needle valve opening ratio, large length-to-diameter ratio, micro-channel, Motor vehicles. Aeronautics. Astronautics, TL1-4050 |
| More Details: |
The cold gas micro-propulsion system can provide low noise and ultra-high accuracy thrust for satellite platforms for space gravitational wave detection, high-precision earth gravity field measurement. In this study, the effect of different needle valve opening ratios on the rarefied flow characteristics of a micro-nozzle in a cold gas micro-propulsion system was investigated based on DSMC method. The special feature of the currently studied micro-nozzle is that it has a section of micro-channel with a large length–diameter ratio up to 4.5. Due to the extremely small needle valve displacement of the nozzle (minimum needle valve displacement up to 1.7 μm), a finely structured mesh was used. The molecular particle and macro flow characteristics inside the micro-nozzle were calculated for the conditions of a needle valve opening ratio from 5% to 98%. The throttling effect of the throat has a significant effect on the rarefied flow in the micro-nozzle; especially under the tiny opening, this effect is more significant. The spatial distribution of continuous flow, transition flow, and free molecular flow in the micro-nozzle varies at different needle valve opening ratios. As the needle valve opening ratio increases, the continuous flow will gradually fill the microfluidic region. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2226-4310 |
| Relation: |
https://www.mdpi.com/2226-4310/10/2/126; https://doaj.org/toc/2226-4310 |
| DOI: |
10.3390/aerospace10020126 |
| Access URL: |
https://doaj.org/article/3a41bc2b6a524b9e8e81db905ed6158d |
| Accession Number: |
edsdoj.3a41bc2b6a524b9e8e81db905ed6158d |
| Database: |
Directory of Open Access Journals |
