Computer Modelinq of an Oil Flooded Single Screw Air Compressor

A computer model of a single screw oil-flooded low pressure air compressor was developed which predicts the internal conditions based on certain empirical values. A characteristic thread technique is used for steady state operation. A polytropic process is used and the model will iterate for the polytropic coefficient to best correlate internal predictions with empirical values. The geometric variables and relationships used to describe the general cylindrical mainrotor-planar gaterotor single screw mechanism are developed. The control volumes and their corresponding governing thermodynamic relationships are defined. The equations used to model the leakage for the various paths are described. The results of the model are compared to the empirical data and the validity of the assumptions used to reduce the general equations is discussed.