涡旋压缩机切向泄漏瞬态流场特性

doi:10.19799/j.cnki.2095-4239.2021.0176

摘要/Abstract

摘要：

以某微型压缩空气储能涡旋压缩机为研究对象，采用计算流体力学(CFD)的方法对涡旋压缩机工作过程进行数值模拟，得到了涡旋压缩机内部压力场、温度场、速度矢量场的瞬态分布，研究了径向间隙引起的切向泄漏对涡旋压缩机工作腔流场分布特点，结果表明：高压腔中的气体通过径向间隙泄漏流入低压腔，会造成腔内速度矢量场、温度场分布不均匀，而泄漏对压力场分布不均匀程度影响较小，但对温度场、速度矢量场分布不均匀程度影响较大；单一腔内下游气体被压缩导致腔内压力分布不均匀，压差的存在影响速度矢量场分布的变化，排气孔偏置导致对称腔压力不对称。该研究可以为涡旋压缩机结构设计提供理论依据。

关键词: 涡旋压缩机, 径向泄漏, 瞬态分析, 数值模拟

Abstract:

Focusing on a miniature compressed air reservoir scroll compressor, the computational fluid dynamics method numerically simulated the working processes of the scroll compressor. Additionally, the internal pressure field, temperature field, and the velocity vector field of the scroll compressor were obtained. The distribution characteristics of the tangential leakage, caused by the radial gap on the flow field of the scroll compressor's working cavity, were studied. The results showed that gas in the high-pressure cavity leaked into the low-pressure cavity through the radial gap, which caused the velocity vector and temperature fields in the cavity were not uniformly distributed, and leakage had little effect on the unevenness of the pressure field distribution; however, it had a greater impact on the unevenness of the temperature and velocity vector fields. The downstream gas in a single cavity was compressed, which gave rise to pressure within the cavity. The distribution was not uniform, and the existence of pressure differences affected changes in the velocity vector field distribution. The offset of the exhaust hole caused pressure asymmetry in the symmetrical cavity. This research presents a theoretical basis for the structural design of scroll compressors.

Key words: scroll compressor, radial leakage, transient analysis, numerical simulation

中图分类号:

TH 45

李正, 刘祯, 吴华伟, 谢东升, 钱伟. 涡旋压缩机切向泄漏瞬态流场特性[J]. 储能科学与技术, 2021, 10(5): 1579-1588.

Zheng LI, Zhen LIU, Huawei WU, Dongsheng XIE, Wei QIAN. The transient flow field characteristics of tangential leakage in scroll compressor[J]. Energy Storage Science and Technology, 2021, 10(5): 1579-1588.

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参数	数值
基圆半径/mm	3
偏心距/mm	6.2782
涡旋齿高度/mm	40
涡旋齿壁厚/mm	3.14
渐开线发生角/rad	0.523
圈数	2.75

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