A twin-screw rotor profile design and computational fluid dynamic simulation method

AbstractThere are increasing demands for more efficient screw compressor design method which could overcome the problems of rotor profile modification and compressor performance test establishment. As a result, non-uniform rational B-spline curves and computational fluid dynamics theory were introduced as a new method of twin-screw compressor rotor profile design. In this paper, unilateral asymmetric combined cycloid with pin gear arc rotor profile was put as the research object to develop a new rotor profile. Non-uniform rational B-spline curves, which are easy to be modified, are applied to the new rotor profile design. The twin-screw compressor flow field simulation models of both the new and the original one are created. The pressure and velocity distribution law of the twin-screw compressor under the operating speed are explored with the FLUENT software. The simulation results provide the basis for further optimisation of the new rotor profile design.