Numerical study on cavitation in a globe control valve with different numbers of anti-cavitation trims  

不同气蚀次数球阀空化的数值研究（英文）

作　　者：Hamidreza YAGHOUBI Seyed Amir Hossein MADANI Mansour ALIZADEH Hamidreza YAGHOUBI;Seyed Amir Hossein MADANI;Mansour ALIZADEH(Department of Mechanical Engineering, Iran University of Science and Technology)

机构地区：[1]Department of Mechanical Engineering,Iran University of Science and Technology,Tehran 16846-13114,Iran

出　　处：《Journal of Central South University》2018年第11期2677-2687,共11页中南大学学报（英文版）

摘　　要：Cavitation is a destructive phenomenon in control valves.In order to delay cavitation,a multi-series of perforated cylindrical plates,called trims,are used.Previously,the effects of orifice diameter and different types of trims have been investigated.In this study,by numerical analysis,a globe control valve was investigated by employing four different cases(without trim,with one trim,with two and three trims)and the impact of the number of these trims on the intensity,formation region and the initiation point of cavitation was analyzed.It was found that the addition of one stage or two stages of trims reduces the intensity and delays the onset of cavitation,relative to the valve without trim.However,no significant differences in terms of intensity and initiation point of cavitation were observed in the cases where two or three trims were used.Therefore,due to the high cost of producing the trims,and the severe drop in flow coefficient,it is not economically and technically justified to increase the number of trims to more than three.空化是控制阀中的一种破坏性现象。为了延缓空化,采用一种多孔圆柱板,称为trim。在此之前,我们曾研究过孔板直径和不同类型的trim的影响。本文采用4种不同工况(无trim,1,2和3 trims)对球阀进行数值分析,分析了trim的数量对气蚀强度、形成区域和空化起始点的影响。结果表明,与不加trim的阀门相比,增加一个或两个trim可以降低气蚀的强度,延缓空化的发生。然而,在使用两到三个trims的情况下,空化的强度和起始点没有明显的差异。由于trim生产成本高,流量系数严重下降,将trim数量增加到3个以上在经济和技术上都是不合理的。

关 键 词：numerical analysis anti-cavitation trim globe control valve 

分 类 号：TH134[机械工程—机械制造及自动化]