排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (6): 710-714    DOI: 10.3969/j.issn.1674-8530.2012.06.018
流体工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
梭式止回阀开启过程的数值模拟
 李良超, 曾祥炜, 向科峰, 徐斌, 宋丹路

(西南科技大学制造科学与工程学院, 四川 绵阳 621010)
Numerical simulation of opening process of shuttle check valve
 LI  Liang-Chao, ZENG  Xiang-Wei, XIANG  Ke-Feng, XU  Bin, SONG  Dan-Lu
(School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China)
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摘要 为了研究梭式止回阀在高压差条件下启闭时阀瓣的运动特性以及阀内可能出现的气穴现象,采用计算流体力学(CFD)方法,建立梭式止回阀阀瓣运动方程和流场气穴模型,并通过动网格技术和用户自定义程序,对梭式止回阀开启过程中阀内速度场、压力场、气穴分布和阀瓣运动特性进行了数值仿真,仿真结果以可视的图形图像形式给出.数值模拟研究表明:梭式止回阀在开启过程中,流体主要沿阀壁流动,阀体中间部位则出现回流;在阀内有涡流存在,在涡流的涡心位置流体流速小、压力低,易产生气穴;气穴的产生和发展与进出口压力大小和阀瓣开度等密切相关,气穴易引起阀内流场的不稳定.阀瓣在压差作用下的运动特性为阀瓣首先开启到一极大开度,并逐渐以波动的形式回归到一稳定的开度,阀瓣在运动到稳定开度附近时速度最大.模拟研究结果可以为梭式止回阀结构参数的设计和优化等提供参考.
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李良超
曾祥炜
向科峰
徐斌
宋丹路
关键词梭式止回阀   开启过程   气穴   计算流体力学   数值模拟     
Abstract: The flow field in a shuttle check valve was numerically simulated by using the CFD method to examine whether the valve is subjected to cavitating flow during its opening process. A user defined subroutine and a dynamic mesh technique were used to involve the pool motion. The results show that the fluid flows mainly along the valve wall and backflow formed in the center of the valve during its opening process. And there have vortices existing in the shuttle valve. Cavity onsets easily in the center of the vortex as the pressure there is the lowest. The inception and development of cavitation in the valve are closely related to the inlet and outlet pressure and valve opening degree. Furthermore, cavitation can cause flow instabilities. It is demonstrated that under a certain pressure difference, the valve spool is opened to the maximum degree initially and then gradually rebound to a stable position with fluctuating steps.
Key wordsshuttle check valve   opening process   cavitation   computational fluid dynamics   numerical simulation   
收稿日期: 2012-05-15; 出版日期: 2012-11-30
基金资助:

四川省科技厅应用技术研究与开发项目(2012JY0050)

通讯作者: 曾祥炜(1944—),男,重庆市中人,教授(kxzxw@163.com),主要从事流体控制研究.   
作者简介: 李良超(1976—),男,安徽桐城人,讲师,博士(tchllc@126.com),主要从事多相流体混合和液压元件内流体流动研究.
引用本文:   
李良超,曾祥炜,向科峰等. 梭式止回阀开启过程的数值模拟[J]. 排灌机械工程学报, 2012, 30(6): 710-714.
LI Liang-Chao,ZENG Xiang-Wei,XIANG Ke-Feng et al. Numerical simulation of opening process of shuttle check valve[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(6): 710-714.
 
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