超高压天然气压缩机气缸的温度场与热应力分析

Temperature Field and Thermal Stress Analysis on Cylinder of Ultra High Pressure Natural Gas Compressor

超高压天然气压缩机的工作压力可达35 MPa,气缸是其极为重要的组成部件,也是最容易出现疲劳、裂纹、磨损等失效形式的区域,为了分析气缸的热应力情况,建立了高压气缸在脉动气体及惯性力作用下的数学模型,利用经验公式近似计算出气缸的热边界条件,然后通过ANSYS有限元分析得到气缸的温度变化云图和热应力变化云图,最后根据仿真结果提出了结构优化的建议。

The working pressure of ultra-high pressure natural gas compressor can reach 35 MPa. The cylinder is an extremely important component and the most prone to failure, crack, wear and other forms of failure. In order to analyze the thermal stress of the cylinder, this paper establishes the mathematical model of the high-pressure cylinder under the action of pulsating gas and inertial force, and uses the empirical formula to approximate the thermal boundary condition of the cylinder. Through the ANSYS finite element analysis, the temperature change nephogram and thermal stress change nephogram of the cylinder are obtained. Finally, the structural optimization is proposed according to the simulation results.