EXPERIMENTAL STUDY OF OIL INJECTION AND ITS EFFECT ON PERFORMANCE OF TWIN SCREW COMPRESSORS

In this paper some individual processes related to oil injection are investigated experimentally to get a better understanding of oil injection and its effect on performance of twin screw compressors. Firstly, a large number of performance data are obtained from test on several types of oil-injected twin screw compressor at various operating conditions, so as to get some performance characteristics of oil-injected twin screw compressors. Secondly, p-V diagrams of a prototype compressor at various operating conditions are recorded and analyzed with the aid of a measuring system of dynamic pressure, in which a signal collector is used to transfer the pressure signal from the transducer embedded in the female rotor to the data acquisition system. Finally, with the laser measuring system PIV used, atomization effects of the injected oil at different oil-injection parameters are visualized and compared, and observation of oil distribution within the working chamber is made on a model compressor and some valuable phenomena are obtained for further investigation.