Numerical calculation and experimental validation of safety valve flows at pressures up to 600 bar
Numerical calculation and experimental validation of safety valve flows at pressures up to 600 bar
复制标题
DOI：
10.1002/aic.12534
复制
发表时间：
2011-12
期刊：
影响因子：
3.7
通讯作者：
A. Beune;Jgm Hans Kuerten;Jürgen Schmidt
中科院分区：
文献类型：
--
作者：
A. Beune;Jgm Hans Kuerten;Jürgen Schmidt
根据阀门定径方法EN ISO 4126-1的要求和高压安全阀的开度特性，建立了数值阀门模型，对其流量进行了预测。使用计算流体动力学软件ANSYS CFX对阀门进行建模，并使用Soave-Redlich-Kwong实际气体状态方程对该模型进行扩展，以允许在高达3600bar的压力下进行计算。建造了一个独特的测试设备，可以在高达600 bar的操作压力下进行水和氮气的阀门功能和容量测试。对于气体流动，质量流量的数值计算结果与实验数据吻合在3%以内，而流动力的平均偏差为12%。将流固耦合作用纳入数值计算方法，可以很好地改善流动力的计算结果，并对开启安全阀的阀门动力学问题有深入的了解。在对比实验和数值确定的液体质量流量时，考虑空化的模型扩展在较小的盘升程下可减少2-20%的过度预测，并将流动力的偏差从35%降低到7%。在较高的圆盘扬程下，空化的影响较小，实验和数值质量流量在4%以内一致，流动力在5%以内一致。
A numerical valve model has been validated to predict the discharge capacity in accordance to the requirements of valve sizing method EN ISO 4126-1 and the opening characteristic of high-pressure safety valves. The valve is modeled with computational fluid dynamics software ANSYS CFX, and the model is extended with the Soave-Redlich–Kwong real-gas equation of state to allow calculations at pressures up to 3600 bar. A unique test facility has been constructed to perform valve function and capacity tests at operating pressures up to 600 bar with water and nitrogen. For gas flows, the numerical results and the experimental data on mass flow rates agree within 3%, whereas deviations in flow force are 12% on average. The inclusion of fluid-structure interaction in the numerical method improves the results for the flow force well and also gives insight into the valve dynamics of an opening safety valve. In a comparison between the experimentally and numerically determined liquid mass flow rates, a model extension accounting for cavitation reduces overpredictions by a factor of 2–20% for smaller disk lifts and decreases the deviations in flow force from 35 to 7%. At higher disk lifts, the effect of cavitation is less, and experimental and numerical mass flow rates agree within 4% and flow forces within 5%.