Thermodynamic Properties of Oil Droplets Impacting on Chamber Wall in Oil-Injected Screw Compressors

As a typical type of positive displacement compressor, screw compressors are widely used in a variety of industrial sectors with a fast-growing trend, especially boosted by the application of oil injection technology. The oil injection process inside the screw compressor is complicated and difficult to observe directly by experiment, as is the accompanying heat transfer process. Since the contact time between the oil and the gas is very short due to the rotation of the rotors, the main object of study remains the heat transfer between the droplet and the chamber wall. In order to investigate the liquid–gas two-phase flow in the compression chamber after oil injection, the Level Set Method is adopted to simulate the impacting process of oil droplet on hot wall with oil film, the influence of oil injection parameters on the heat transfer between oil droplets and wall was analyzed theoretically. The present study contributes to further understanding and accurate prediction of the heat transfer process in oil-injected screw compressors, which is important for improving the energy efficiency of screw compressors. In addition, this research is not only relevant to screw compressor, but also has universal significance for liquid injection technology.