旁路系统高参数减压阀温度场与应力场分析

为了优化旁路系统减压阀阀体结构以提升其在高参数工况下的安全性能，采用有限元分析方法对某高压旁路系 统减压阀承压热冲击强度进行了数值模拟分析，获得了在瞬态和稳态工况下阀体的温度场与应力场的分布情况及其变 化规律。模拟结果表明：开启工况下，阀体应力经历先增大后减小直至稳定的变化过程，395 s时综合应力值达到最大值 131.3 MPa；稳态工况下，最大综合应力值出现于第1级孔板前的位置，数值为96. 597 MPa。由此可得结论：减压阀瞬态 工况为危险工况，温差应力占主导地位。阀体设计中应避免阀体壁厚突变的结构。

Analysis of Temperature and Stress Field on High Parameters Pressure Reducing Valve of Bypass System

For the purpose of optimizing the valve structure to enhance the safety performance of pressure reducing valve in bypass system under high parameters conditions. the finite element analysis method was applied to conduct numerical simulation analysis to pressurized thermal shock strength of one pressure reducing valve in high pressure bypass system. The distribution and variation of temperature and pressure under steady and transient condition was obtained. The simulations illustrate that when the valve is open, the stress increases firstly and then gradually reduces until the stress of value remain unchanged, and the combined stress reaches the maximum of 131. 3 MPa at 395 s. Under steady condition. the maximum combined stress of 96. 597 MPa appears before the first orifice. The available conclusion shows that transient condition is the dangerous working condition of pressure reducing valve, and the differential temperature- stress dominates. The abrupt structure change of the valve wall should be avoided in the valve design.