Abstract: The composite gear-type compressor is a new type of rotor compressor with partail built-in compressing process. The thermodynamic performance is studied theoretically and experimentally. Mathematical models for analyzing thermod- ynamic performance is established on the basis of a all-round and through analysis on its working process. The effects of leakage, heat transfer and flow through discharge port and so on are accounted for in thermodynamic models. In the experiental investigation, performance is measured at various discharge pressures. Theoretical calculations and experiment results are compared and analyzed, and the mathematical models are verified by comparison. It is concluded that the performance is influenced greatly by four factors: mixing process, over-compression, leakage and friction.

Key words: Experiment, Thermodynamical model, Performance analysis, Rotor compressor, Interfacial reaction, Intermetallic compound (IMC), Shear strength, Au-Sn/Ni joint