Flow Characteristic of Scroll Compressor with Combined Profile Scroll

Scroll compressor is widely used in machines for gases compression, and scroll profile is the basic of a scroll compressor. The combined profile of scroll has advantages of several single scroll profiles. For improving the performance of a scroll compressor, it is necessary to investigate characteristics of the internal flow of combined profile of scroll compressors. In this paper, the combined profile is composed of the base circle involute-variable radius and base circle involute. A two-dimensional transient flow model of the combined profile of scroll refrigeration compressor operating with ammonia is established. The pressure, temperature, and velocity distribution of the working chamber are collected using the computational fluid dynamic method. Based on comparison between the combined profile and the circular involute profile, it is found that the combined profile is more favorable to bear the pressure, decrease the leakage, and decrease the fluctuation of mass flow rate than the circular involute profile.