Abstract: In order to improve the energy efficiency of the rotary two-stage compressor, the two-stage compression chamber uses structural mesh to divide the compression chamber, calls FORTRAN in CFX to control the radial movement of the nodes of the compression chamber, and simulates the primary and two-stage compression processes. Subsequently, experiments verify that the simulation model is accurate, providing theoretical support for energy efficiency improvement. Based on the validated model, three types of intermediate chambers are proposed, and hybrid configurations, the intermediate chamber is arranged inside the compressor, outside the compressor, and the hybrid structure of the two. The result analysis shows that the structure of the intermediate chamber determines the first stage exhaust pressure, second stage suction pressure, and pressure pulsation. The intermediate chamber is arranged inside the compressor, with low first stage exhaust pressure and large pressure pulsation, low power consumption, and optimal energy efficiency, providing support for subsequent energy efficiency improvement.

Key words: Two stage compressor, Intermediate cavity, Energy efficiency, Pressure fluctuation