【摘要】 双级过载保护安全阀优化设计可显著提升其性能与可靠性。由于双级过载保护安全阀在运行过程中受到外界干扰因素影响较多，现有方法难以探究不同设计参数对安全阀性能的影响规律，存在优化效果不佳的问题。为此，开展双级过载保护安全阀优化设计及三维流场仿真研究。该方法对双级过载保护安全阀开启时与开启后的状态展开建模进行了调查，将分析结果作为依据，对安全阀参数进行改进，在Fluent软件内根据参数优化结果建立安全阀三维模型，并设置相关边界条件，与此同时对安全阀三维模型展开三维流场仿真分析。仿真结果表明，设计的双级过载保护安全阀，其一级和二级阀芯均展现出卓越的稳定性和灵敏反应。动态特性方面，一级阀芯在1.9 ms内达到压力峰值(超调21.36%),7 ms后稳定，流量呈现非线性波动；二级阀芯压力峰值时间为2.5 ms(超调18.7%),6 ms内稳定，流量在3 ms达峰值后伴随高压冲击振荡，两者均展现出高灵敏度与场景适配能力。启溢闭特性优化后，一级阀芯压力波动范围从473～511 bar降至435～458 bar, 1.5 s内达稳态，启溢比压力合规；二级阀芯优化后压力整体降低且波动减弱，1.5 s后稳定，极值满足检验标准，安全阀应用效果较好。更多还原

【Abstract】 The optimized design of the dual level overload protection safety valve can significantly improve its performance and reliability. Due to the significant influence of external interference factors on the operation of the dual level overload protection safety valve, existing methods are difficult to explore the impact of different design parameters on the performance of the safety valve, resulting in poor optimization effects. Therefore, the optimization design and three-dimensional flow field simulation research of the dual stage overload protection safety valve are carried out in this work. This method investigated the modeling of the opening and closing states of the dual level overload protection safety valve, and used the analysis results as a basis to improve the safety valve parameters. Based on the parameter optimization results, a three-dimensional model of the safety valve was established in Fluent software, and relevant boundary conditions were set. At the same time, three-dimensional flow field simulation analysis was carried out on the three-dimensional model of the safety valve. The simulation results show that the designed two-stage overload protection safety valve exhibits excellent stability and sensitive response in both the first and second stage valve cores. In terms of dynamic characteristics, the first stage valve core reaches the pressure peak within 1.9 ms(overshoot 21.36%), stabilizes after 7 ms, and exhibits nonlinear fluctuations in flow rate. The peak pressure time of the secondary valve core is 2.5 ms(overshoot of 18.7%), stable within 6 ms, and the flow reaches its peak at 3 ms accompanied by high-pressure shock oscillation. Both demonstrate high sensitivity and scene adaptability. After optimizing the opening and closing characteristics, the pressure fluctuation range of the first stage valve core decreased from 473～511 bar to 435～458 bar, reaching steady state within 1.5 seconds, and the opening and closing pressure ratio was compliant. After the optimization of the secondary valve core, the overall pressure decreased and the fluctuation weakened. After 1.5 seconds, it stabilized, and the extreme value met the inspection standards. The application of the safety valve was successful.更多还原