涡旋压缩机油气分离器分离特性及压降的数值模拟
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摘要
电动汽车空调涡旋压缩机油气分离器的性能对空调系统的安稳运行及压缩机的润滑与密封均起着至关重要的作用。针对这种油气分离器结构尺寸小,要求其压降小,分离效率高,转速适用范围宽等特点,为探寻其内部的流动规律、压降及分离效率随转速的变化规律,首先选用适用于强旋流流动的雷诺应力模型(RSM),模拟计算了油气分离器中流体的流线图和速度分布;利用DPM模型对气液二相流进行数值模拟,计算了压缩机在不同转速下油气分离器中润滑油的分离效率及流体压降。分析结果表明,气体在分离器中做准自由涡流动和准强制涡流动,分离效率随油滴粒径的增大而提高,压缩机转速较低时,分离效率随转速的降低而急剧降低,压降与转速的平方成比例增大。最后,给出了优化设计电动涡旋压缩机油气分离器的设计方法。
The performance of oil-gas separator of scroll compressor for electric vehicle air conditioner plays a significant role in the stable operation of the air conditioning system and the lubrication and sealing of compressor. In view of small size of such oilgas separator,it is required to have the characteristics of low pressure drop,high separating efficiency and wide application range of rotational speed. In order to explore the internal flow law,pressure drop and separation efficiency with the change of rotational speed,the Reynolds stress model(RSM) suitable for strongly swirling flow was chosen firstly,and the streamline diagram and velocity distribution of the fluid in the oil-gas separator were simulated. The DPM model was used to simulate the gas-liquid two-phase flow,and calculate the separation efficiency and fluid pressure drop of the lubricating oil in the oil-gas separator.The analysis results show that the gas performs quasi-free vortex flow and quasi-forced vortex flow in the oil-gas separator. The separation efficiency increases with the increase of the oil droplet size. When the compressor speed is low,the separation efficiency decreases sharply with the decrease of the rotational speed,and the pressure drop increases in proportion to the square of the rotational speed. Finally, the method for optimizing the design of the electric scroll compressor oil-gas separator was given.
The performance of oil-gas separator of scroll compressor for electric vehicle air conditioner plays a significant role in the stable operation of the air conditioning system and the lubrication and sealing of compressor. In view of small size of such oilgas separator,it is required to have the characteristics of low pressure drop,high separating efficiency and wide application range of rotational speed. In order to explore the internal flow law,pressure drop and separation efficiency with the change of rotational speed,the Reynolds stress model(RSM) suitable for strongly swirling flow was chosen firstly,and the streamline diagram and velocity distribution of the fluid in the oil-gas separator were simulated. The DPM model was used to simulate the gas-liquid two-phase flow,and calculate the separation efficiency and fluid pressure drop of the lubricating oil in the oil-gas separator.The analysis results show that the gas performs quasi-free vortex flow and quasi-forced vortex flow in the oil-gas separator. The separation efficiency increases with the increase of the oil droplet size. When the compressor speed is low,the separation efficiency decreases sharply with the decrease of the rotational speed,and the pressure drop increases in proportion to the square of the rotational speed. Finally, the method for optimizing the design of the electric scroll compressor oil-gas separator was given.
引文
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[2]朱元成,熊伟国,吴群.电动空调在汽车领域的应用解析[J].科技创新与应用,2017(3):166
[3]刘兴旺,张官正,李超,等.涡旋压缩机径向迷宫密封中泄漏气体气动热力行为研究[J].机械工程学报,2015,51(20):201-207.
[4]赵科,童水光,吕红兵,等.压缩机用直线振荡电机防失磁设计研究[J].机电工程,2018,35(5):524-528.
[5]王建吉,刘涛,孙旖彤,等.旋涡压缩机齿顶密封条摩擦磨损性能的研究[J].流体机械,2018,46(4):1-5.
[6]周华,夏南.油气分离器内气液两相流的数值模拟[J].计算力学学报,2006,23(6):766-771.
[7]冯健美,畅云峰,屈宗长,等.油气分离器内油滴运动轨迹的数值模拟[J].西安交通大学学报,2006,40(7):771-775.
[8]周云龙,米列东.气液旋流分离器进口宽高比优化的数值模拟[J].过程工程学报,2013,13(5):754-759.
[9]Donglim Nam,Poyoung Lee.Experimental investigations on the performance improvement of oil-gas separator in electric driven scroll compressor for eco-friendly vehicles[C]//23th international compressor engineering conference at purdue,2016.
[10]刘兴旺,庞成武.电动汽车空调涡旋压缩机油气分离性能的研究[J].流体机械,2018,46(1):34-39.
[11]蒋梦婷,王博,陈言信,等.旋风分离器内高速旋转流场的数值计算方法选择[J].环境工程学报,2012,6(8):2736-2744.
[12]周威,潘李奎,肖芳斌.空调用高效旋流油分离器仿真优化与实验[J].制冷学报,2016,37(6):35-42.
[13]李琴,邹康,刘海东,等.基于颗粒受力的旋风分离器冲蚀机理的研究[J].流体机械,2017,45(3):42-47.
[14]霍夫曼A C,斯坦因L E.旋风分离器:原理、设计和工程应用[M].北京:化学工业出版社工业装备与信息工程出版中心,2004:30-80.
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