Fundamental Study on Oil Mist Separation in Swirl Flow
Fundamental Study on Oil Mist Separation in Swirl Flow
复制标题
DOI：
10.1115/fedsm2013-16254
复制
发表时间：
2013-07
期刊：
影响因子：
--
通讯作者：
Yuhei Ito;A. Hiwata;Kotaro Sato
中科院分区：
文献类型：
--
作者：
Yuhei Ito;A. Hiwata;Kotaro Sato
近年来，随着流体机械的不断小型化，流体机械中使用的旋转速率一直在增加。但是，由于该高转速，在压缩机内形成的润滑油雾有可能与制冷剂气体混合，从而有可能导致热交换效率的降低。为提高油雾分离效率，本文试图从理论上阐明旋流作用下制冷剂气体-润滑油雾两相流的分离机理。采用实验和数值模拟相结合的方法，研究了带转子的试验室内油雾分离效率与流动特性的关系。结果表明，旋流数Sw决定了流动特性，当Sw = 1.0、1.5和3.0时，流动形态有很大的不同。此外，油雾分离效率增加与Sw，也表现出依赖于室的纵横比。还在各种条件下评估了作用在腔室中的虚拟颗粒上的离心力。
Recently, the rotation rates used in fluid machines have been increasing as such machines continue to be downsized. However, these high rotation rates lead to the possibility of lubricant oil mist formed inside the compressor becoming mixed with the refrigerant gas, which can lead to a decrease in the heat exchange efficiency. The present study attempted to clarify the separation mechanism for refrigerant gas-lubricant oil mist two-phase flow during swirl flow in order to improve the oil mist separation efficiency. Both experiments and numerical simulations were carried out to investigate the relation between the oil mist separation efficiency and the flow characteristics in a test chamber containing a rotor. It was found that the flow characteristics were determined by the swirl number Sw, and the flow pattern was quite different for Sw = 1.0, 1.5 and 3.0. In addition, the oil mist separation efficiency increased with Sw and also showed a dependence on the chamber aspect ratio. The centrifugal force acting on a virtual particle in the chamber was also evaluated under various conditions.Copyright © 2013 by ASME