摘要
针对纯水支架用安全阀存在的气穴、气蚀问题,在分析其结构原理的基础上,基于湍流和气穴模型,采用计算流体动力学(CFD)方法建立了纯水安全阀开启时阀芯孔道的仿真模型,对不同径向排孔结构形式时的气穴特性进行了仿真分析。研究结果表明:纯水安全阀径向排孔出口处的气相体积分数沿径向出口孔圆周方向呈环状不对称分布,其中靠近阀芯入口壁面处高于远离入口那侧,是产生气穴的核心区域;单列径向排孔前提下,减少孔数、增大孔径对安全阀阀口气蚀现象有抑制作用,但效果一般;增加通流面积的双列径向排孔可有效减小出口处的气相体积分数,降低气穴形成概率。
Aiming at the cavitation problem of the safety valve for pure water support,based on the analysis of its structural principle,based on the turbulence and cavitation model,the simulation model of the valve core channel was established by using the computational fluid dynamics(CFD)method when the pure water safety valve was opened,and the cavitation characteristics of different radial row hole structures were simulated and analyzed.The results show that the gas volume fraction at the outlet of the radial discharge hole of the pure water safety valve is asymmetrically distributed in a ring along the circumference of the radial outlet hole,and the wall near the inlet of the valve core is higher than the side away from the inlet,which is the core area of cavitation.On the premise of single row radial hole arrangement,reducing the number of holes and increasing the hole diameter can inhibit the cavitation phenomenon at the valve port of the safety valve,but the effect is general.The double row radial holes with increased flow area can effectively reduce the gas volume fraction at the outlet and reduce the cavitation probability.
作者
罗文
Luo Wen(Shendong Coal Group Co.,Ltd.,CHN Energy Group,Yulin 719315,China)
出处
《煤矿机械》
2023年第3期94-97,共4页
Coal Mine Machinery
关键词
纯水安全阀
CFD
气穴
气相体积分数
pure water safety valve
CFD
cavitation
gas phase volume fraction