径向间隙与转速对滚动转子压缩机油膜密封角的影响OA北大核心CSTPCD

In order to solve the problem that the oil film length is regarded as a constant value when the radial gap leakage in the rolling rotor compressor is routinely calculated,the influence of the oil film length on the compressor performance is deeply discussed.Based on the actual parameters of the micro rolling rotor compressor,the mixed flow process of refrigerant R290 and lubricating oil PAG32 in the compression chamber was simulated by using the VOF multiphase flow model,and the dynamic change characteristics of the oil film in the radial gap channel were emphatically revealed,and the specific effects of different radial clearance and rotation speed on the sealing angle of the oil film were studied and analyzed.The results show that when the radial clearance decreases from 35 μm to 10 μm,the maximum sealing angle of the oil film increases from 14° to 42°,and the smaller radial clearance is conducive to the formation of a larger oil film sealing angle,and the oil film can be maintained for a longer time,which significantly reduces the gas leakage.The rotational speed was increased from 2000 r/min to 4000 r/min,and the maximum sealing angle of the oil film was increased from 31° to 43°,and the higher speed helped to form a larger oil film sealing angle during the exhaust phase of the compressor,but the increase of the rotor wall speed significantly exacerbated the radial leakage caused by the wall shear force,resulting in an increase in the total leakage mass flow.The research results can provide a reference for the design and development of rolling rotor compressors.