【作者】 李德富； 夏新林； 黄伟成；

【Author】 LI De-fu,XIA Xin-lin,HUANG Wei-cheng (School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

【机构】 哈尔滨工业大学能源科学与工程学院；

【摘要】 为了研究高压过热蒸汽安全阀的动力学特性,建立了复杂结构安全阀的三维可压缩流动分析模型。采用基于有限体积法的耦合求解器对高压安全阀内部复杂流场进行数值求解,湍流模型采用RNG^k-ε模型。工质为真实过热水蒸汽,考虑了动力粘度、热导率等物性随压力和温度的变化。通过分析不同入口压力情况下安全阀内的流动特性,得出不同热负荷条件所对应的阀门动力学特性和排放量。研究结果表明,阀瓣轴向力随开度的增加先下降后增加。更多还原

【Abstract】 A three-dimensional compressible flow model was established to analyze the dynamic behavior of a high-pressure safety valve.The coupled solver used in this paper to calculate N-S equations were based on finite volume technique,and the RNG k-εturbulent model was used to model the complex turbulent flow.The dependence of superheated steam density on its pressure and temperature was considered.The dynamic behavior and the mass flow rate have been presented by analyzing the internal flow field under different inlet pressure.The results show that the axial force exerted by the fluid on the valve clack first decreases with the increase of the valve opening and then increases.更多还原