Obtaining the Optimum Geometrical Parameters of a Refrigeration Helical Screw Compressor

Abstract

This paper presents a method for optimizing the geometrical pa.rameters of a refrigeration twin-screw compressor.The method optimizes rotor profile and discharge port position etc., by making use of two efficient computer programs; the geometrical parameter calculation program and the performance prediction program.Two new parameters; relative blow hole area and relative contact line le~th, are introduced to compare the blow hole areas and contact line len!!;ths of different rotor profiles.These new parameters, which are .determinedhy profiles alone, have an important and direct influence on the performance of the compressor, so that they are suitable for used in an optimization process.A technique for reducing the blow hole area by manipulating its shap" in accordance with a logical proc.,dure is described.Calculation and test results arP included and discussed in the paper.