Piston deformation analysis based on two-way thermo fluid solid coupling
To study the influence of refrigerant temperature and pressure on piston deformation,A three-dimensional model of CO2 compressor piston,refrigerant in the cylinder,and refrigerant in the leakage channel was established.ANSYS software was used to perform finite element analysis on the corresponding models,and the pressure and temperature distribution of refriger-ant in the cylinder and refrigerant in the leakage channel under the expansion and compression stroke were obtained;Through thermal fluid structure coupling,the deformation of the piston under the influence of refrigerant in the cylinder and leakage chan-nel during the expansion stroke and compression stroke were discussed.The results show that compared to the refrigerant in the leakage channel,the refrigerant in the cylinder has a greater impact on the deformation of the piston;At the end of the compres-sion stroke,under the influence of the temperature and pressure of the refrigerant in the cylinder and the refrigerant in the leakage channel,the maximum deformation of the piston is 0.167 mm and 6.474 × 10-3 mm,respectively,and the maximum stress is 248.11 MPa and 74.864 MPa;At the end of the expansion stroke,the maximum stress of the piston under the influence of the temperature and pressure of the refrigerant in the cylinder and the refrigerant in the leakage channel is 15 MPa and 15.235 MPa.The research results provide a theoretical basis for the study of piston deformation under force.
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