期刊
APPLIED THERMAL ENGINEERING
卷 175, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.115368
关键词
Trans-critical; Carbon dioxide; Scroll compressor; Thermodynamics; Over-compression; Leakage flow
资金
- National Natural Science Foundation of China [51906015]
- Youth Program of Natural Science Foundation of Beijing, China [3194057]
- Beijing Institute of Technology Research Fund Program for Young Scholars [2-2050205-2019CX04024]
- China Postdoctoral Science Foundation [2018M640078]
Heat pump air-conditioning system operating with trans-critical CO2 is a promising technology on electric vehicles, and scroll compressor has played a vital role in micro heat pump air-conditioning system. In order to obtain a better performance of scroll compressor for CO2, internal flow characteristics should be investigated. In this paper, an unsteady Reynolds Average Navier-Stokes of working process in a scroll compressor operating with trans-critical CO2 was firstly carried out. The effect of CO2 properties tables resolution on numerical simulation was investigated in detail. Then, some phenomena including pre-compression and over-compression in the working process were presented. Finally, physical mechanisms of asymmetric leakage flow considering influence of aerodynamics and thermodynamics were revealed. The results indicated that CO2 properties tables resolution hardly affects simulation results considering fierce fluctuations of CO2 properties near critical point. Periodic pre-compression and over-compression was mainly induced by geometrical structure and operation mechanism of scroll compressor. Asymmetric flow fields in circumferential direction were also observed due to unilateral inlet and orbiting scroll rotation. Meanwhile, so-called quasi-centrosymmetric leakage flow was captured in compression chambers owing to the non-uniform distribution of flow field. The results provide an instrumental guidance for optimal design of trans-critical CO2 scroll compressor.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据