Acta Metrologica Sinica  2021, Vol. 42 Issue (3): 327-333    DOI: 10.3969/j.issn.1000-1158.2021.03.11
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Multi-Factor Coupling Effect of Subsonic Nozzle on Gas Flow Distribution
ZHANG Han1,JIA Li1,CUI Li-shui2,LI Chun-hui2
1. Beijing Jiaotong University, Beijing 100044, China
2. National Institute of Metrology, Beijing 100029, China
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Abstract  In order to study the interaction of gas flow field evolution in subsonic nozzle, the coupling effect of pressure-velocity-contraction ratio on the velocity profile was quantitatively evaluated. Based on the standard k-ε turbulence model, the numerical simulation was utilized for the uniform gas flow field in the subsonic nozzle under coupling effect and the key parameters of top-hat flow field distribution were defined. The results show that within multi-factor coupling, the subsonic nozzle can change the quality of the flow field distribution by influencing the key points of the strengthening process including the equilibrium point and the critical position point of the pressure gradient. Increasing the gas pressure can effectively reduce the boundary layer thickness in the tectonic flow field, reduce the dependence of the key points on the flow velocity in the process, and improve the stability of the boundary layer thickness under different flow velocities. The increase of contraction ratio leads to the further deviation of the flow field from the ideal distribution.
Key wordsmetrology      subsonic nozzle      flow field distribution      pressure gradient      pressure coupling effect     
Received: 19 November 2020      Published: 23 March 2021
PACS:  TB937  
Fund:National Key R&D Program of China
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ZHANG Han
JIA Li
CUI Li-shui
LI Chun-hui
Cite this article:   
ZHANG Han,JIA Li,CUI Li-shui, et al. Multi-Factor Coupling Effect of Subsonic Nozzle on Gas Flow Distribution[J]. Acta Metrologica Sinica, 2021, 42(3): 327-333.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.03.11     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I3/327
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