Simulation and Experiment Study on Dynamic Characteristic of Reed Valve of Reciprocating Compressor Based on Fluid-Structure Interaction Model

Abstract

Abstract The working process of the suction valve with complex shape called “boqi” and the discharge valve with four arms were simulated by the three-dimensional fluid-structure interaction method in this paper. By setting the gap boundary condition between the valve and the valve plate, hanged the connection between the valve and the valve plate in the model, and the problem of flow area connectivity caused by the opening and closing of the valve was solved. It solved the mesh overlapped and distorted problem caused by the valve motion. According to the simulation, the results of valve’s dynamic characteristic and gas pressure were obtained. A valve displacement test bench of reciprocating compressor was built, and the valve motions under different rotational speed and different pressure ratio was tested. Comparing the simulation results with the experimental results, it shows that the three-dimensional fluid-structure interaction model can be used to simulate the interaction between the valve with complex shape and the compressor fluid field. From the simulation results, the pressure cloud map of the valve under different conditions was extracted. Finally, the method proposed in this paper was used to analyze the valve’s displacement, speed and stress.