Experimental study of lubricating oil impact on pressure pulsation for twin-screw refrigeration compressor

摘要

An experimental investigation on pressure pulsations of twin-screw refrigeration compressor was conducted. The pressure pulsation energy at different radial locations on the screw housing, inside the discharge chamber, and the energy transmitting to downstream components during the working process were all tested. Various oil parameters have been investigated to disclose its influence on the pressure pulsation energy of twin-screw refrigeration compressors. With the total oil flow rate increasing, pressure pulsation was found attenuating above the 1st order of pumping frequency, while the amplitude reduction was found depended on the oil injection locations and oil distributions obviously. The final compression pressure inside the screw lobe cavity before the internal discharge port opening was found to be much lower than the expected value based on the built-in radial Vi, and the pressure continued increasing until the axial port opening around 5.45 degrees. Several suggestions about design for lower pressure pulsations were recommended based on test findings. (C) 2019 Elsevier Ltd and IIR. All rights reserved.