The substantial energy consumption driven by industrial and technological advancements, coupled with rapid global economic growth, has led to significant environmental issues, necessitating investment in energy-saving mechanical devices. Compression resorption heat pumps (CRHPs) are particularly important due to their efficiency across a wide temperature range and superior heat recovery via resorption. The twin-screw compressors in these heat pumps play a critical role, with wet compression often used to manage temperature and prevent overheating through heat transfer from vapor to evaporating water droplets. Understanding the complex turbulent multiphase flows within these compressors requires both experimental and numerical approaches.

This research simplifies the geometry of twin-screw compressors to focus on key features such as suction and discharge fluid domains and screw rotors, omitting external leakage and heat loss due to internal friction. Stationary fluid domains are meshed using Ansys Meshing and Fluent Meshing, and their grid quality and compatibility with Ansys CFX are compared. The narrow and irregular screw domains are meshed in TwinMesh using a ”mixed” method, fixing nodes on the female rotor while allowing movement on other curves. The combined meshed domains are then imported into Ansys CFX, where rotational reference frames and boundary conditions are set, preparing for mesh independence studies and flow analysis of both single-phase airflow and ammonia-water multiphase flows to verify the effectiveness of wet compression. Additionally, the influence of gap seals with changeable diameters, which partially recirculates the outlet mass flow back into the suction chamber, on global pressure and mass flow rate is discussed. The simulated results of volumetric efficiency and compressor power consumption are compared with Marina’s experimental data to further verify its reliability.