基于流固耦合模型的制冷压缩机排气回流研究

Outlet backflow has an important impact on the energy efficiency of reciprocating refrigeration compressors. The outlet backflow occurs when discharge valve and flow-field interact with each other. Influenced by positon, velocity and flow-field, it is hard to measure the outlet backflow accurately. The fluid-solid interaction model of refrigeration compressor is established. The numerical simulations conducted to characterize the circulation of valve motion and refrigerant process of the refrigerant in the compressor is carried out. The accuracy of the model is verified by the experimental platform. Based on the fluid-solid interaction model, the outlet flow of the compressor can be quantitatively calculated.The variation of outlet backflow under different compression ratios, different speeds and different limiter heights is studied. The simulation results show that the greater the compression ratio, the greater the exhaust mass flow, and the higher the stopper height, the greater the exhaust return flow. The change of the speed has much influence on the compressor outlet backflow. The fluid-solid interaction model combines the dynamic characteristics of the valve plate to analyze the flow and flow rate changes, which provides a new methodology for the optimization of the refrigeration compressor.