Experimental study of lubricating oil impact on pressure pulsation for twin-screw refrigeration compressor. (April 2020)

• Record Type: Journal Article
• Authors: Yang, Shengmei; Ouyang, Hua; Wu, Yadong; Wang, Lee
• Is Part Of: International journal of refrigeration. Volume 112(2020)
• Page Start: 324
• Page End: 332
• Publication Date: 2020-04
• Subjects: Pressure pulsation -- Oil parameters -- Twin-screw compressor -- Refrigeration; Pulsation de pression -- Paramètres de l'huile -- Compresseur à double vis -- Froid; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2019.12.018
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: Lubricating oil was found attenuating the pressure pulsation energy above the 1st order of pumping frequency. The amplitude reduction of pressure pulsation depended on oil injection locations and distribution obviously. The final compression pressure inside screw lobe cavity was found much lower than the expected value based on built-in radial VI. The refrigerant pressure inside the last lobe cavity continued increasing until the axial port opening around 5.45°. Several suggestions about design for lower pressure pulsation were recommended. Abstract: 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°. Several suggestions about design for lower pressure pulsations were recommended based on test findings.