王黎,郑智剑,肖定浩,偶国富
WANG Li,ZHENG Zhi-jian,XIAO Ding-hao,OU Guo-fu

• 1:神华鄂尔多斯煤制油公司
• 2:国家气动产品质量监督检验中心
• 3:浙江理工大学流动腐蚀研究所

摘要(Abstract)：

采用煤液化热高分液控阀的实际操作条件、工艺介质和结构特性,基于两相空化流动方程、Lagrangian固体颗粒控制方程和RNG k-ε湍流模型,开展空蚀和磨损的耦合计算。计算结果表明:在阀芯的出口处,由于流速降低导致的分离现象,会出现回流区和空化带;在阀芯和阀座的间隙处,由于局部压力降低至液相的饱和蒸汽压以下,阀芯壁面存在明显的空化区域,易发生空蚀;阀座的近壁面存在高速固体颗粒的团聚现象,易发生磨损。实际失效案例与数值计算的结果基本一致,验证了数值计算的可靠性。
According to the actual operating conditions,process medium and structural properties of hydraulic control valve in coal liquefaction high temperature and pressure separator,the cavitation-wear coupling calculation was carried out based on the two-phase cavitating flowing equation,lagrangian solid particles control equation and RNG k-ε turbulence model. The results showed that: the recirculation and cavitation region was formed in the outlet of the valve piston because of the flowing separation induced by the decreasing of flow rate; In the gap between the valve seat and piston,due to the local pressure is reduced to lower than the saturation vapor pressure of the liquid,the obvious cavitation region appeared in the wall of the valve piston and the cavitation erosion is prone to occur; the wear is also prone to happen for the agglomeration phenomenon of the high speed solid particles near the wall of the valve seat. The actual failure case is basically in accordance with the numerical simulation results,the reliability of the calculation is verified.

关键词(KeyWords)： 液控阀;空蚀;磨损;数值模拟;耦合计算
hydraulic control valve;cavitation-erosion;wear;numerical simulation;coupling calculation

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王黎,郑智剑,肖定浩,偶国富
WANG Li,ZHENG Zhi-jian,XIAO Ding-hao,OU Guo-fu

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