摘要
蒸汽压缩式热泵作为空间热控制系统对未来航天有着重大的意义,而蒸汽压缩式热泵的核心部件之一是压缩机。为了探究重力对压缩机气液分离器回油特性的影响,对常重力和微重力环境下回油进行分析并开展数值模拟。建立了气液分离器的数学模型,并利用Fluent软件对其内部的气-油混合物进行了数值模拟,探讨了重力对润滑油相分布的影响以及润滑油量和速度对在微重力下流场的影响。数值模拟的结果表明,当压缩机入口速度大于10 m/s或重力加速度小于0.04 m/s^2时,制冷剂和润滑油的混合物可平稳回流。尽管微重力下气液分离器可以正常运行,但是会使大量润滑油进入压缩室,造成压缩恶化,严重影响压缩机的性能,后续会针对微重力下润滑油大量进入压缩室造成的压缩恶化对压缩机进行微重力适应性改造。
Vapor compression heat pump has good significance for future space applications.Compressor is a key component of vapor compression heat pump.In order to explore the influence of gravity on the oil return characteristics of micro rolling rotor compressor gas-liquid separator,analysis and numerical simulation of the oil return in constant gravity and microgravity environment were conducted.The mathematical model of gas-liquid separator was established,and the numerical simulation of gas-oil mixture in gas-liquid separator was carried out by Fluent software.The influence of gravity on the lubricating oil phase distribution and the influence of lubricating oil quantity and velocity on the flow field under microgravity were discussed.The results of numerical simulation show that when the compressor's inlet velocity is greater than 10 m/s or the acceleration of gravity is less than 0.04 m/s^2,the mixture of refrigerant and lubricating oil can reflux smoothly.Although the gas-liquid separator can operate normally under microgravity,it will lead to a large number of lubricating oil entering the compression chamber,resulting in compression deterioration and seriously affecting the performance of the compressor.Therefore,in order to solve the problem of compression deterioration caused by a large number of lubricating oil entering the compression chamber under microgravity,the compressor will be modified to adapt to microgravity.
作者
叶一琳
马瑞
马旭东
闫素英
王峰
吴玉庭
YE Yi-lin;MA Rui;MA Xu-dong;YAN Su-ying;WANG Feng;WU Yu-ting(College of Energy and Power Engineering,Inner Mongolia University of Technology,Huhehaote 010051,China;Key Laboratory of Wind Energy and Solar Energy Utilization and Optimization in Inner Mongolia Autonomous region,Huhehaote 010051,China;College of Environment and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《科学技术与工程》
北大核心
2020年第25期10138-10143,共6页
Science Technology and Engineering
基金
国家自然科学基金(51906116)
内蒙古自然科学基金(2019BS05007)
内蒙古工业大学校基金(BS201918)。
关键词
蒸汽压缩式热泵
回油
气液分离器
微重力
数值模拟
压缩机
气液两相流
vapor compression heat pump
oil return
gas-liquid separator
microgravity
numerical simulation
compressor
gas-liquid flow
