高压核电平板闸阀的设计与数值模拟  

Design and numerical simulation of high-pressure nuclear power gate valves

作　　者：刘建瑞[1] 李昌[1] 刘亮亮[1] 何小可[1] 向宏杰[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2012年第5期573-577,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省科技支撑计划项目(BE2010116)

摘　　要：针对核电工业的需要设计了公称压力为25 MPa、公称直径为150 mm的高压电动平板闸阀,介绍了其主要结构的设计及计算方法.分析了阀门开启状态下流动压力损失的产生原因及分布区域.对阀门进行了流固耦合计算,以研究介质载荷对其结构产生的影响.建立了闸阀及水体的三维模型,利用CFX软件对模型进行网格划分并定义边界条件,计算后得到了介质流动状态下的压力、速度分布,并指出了产生压力损失的主要部位.利用Ansys软件将介质载荷施加到闸阀上进行流固耦合分析.结果表明,介质在阀座区产生涡流损失,阀座区之后静压值明显下降,流道壁面处流速减小,闸阀中腔上部的压力降和速度都很小.闸阀的流阻系数为0.093,闸阀的最大变形为19.4μm,最大应力值为70.8 MPa,分别位于阀座出口端的顶部和侧面;开启状态下闸阀的变形及应力均在允许范围内.A high-pressure electric actuated gate valve with 25 MPa nominal pressure and 150 mm nominal diameter was designed for the needs of nuclear power industry,the design and calculation method of its main structure was introduced.The reasons for pressure loss production and the locations where the loss happened as the valve was in open.The FSI（fluid-structure-interaction） in the valve was simulated to show the influence of fluid pressure and velocity on the valve structure.The three-dimensional structure model and water fluid domain of the valve were established,the CFX software was used to mesh the models and define the boundary conditions,then the pressure and velocity distribution in the valve were calculated,and the locations where the major pressure loss was generated was clarified.The fluid pressure was applied to the gate valve in Ansys to carry out an FSI analysis.The results showed that there are vortices around the valve seat,and the fluid static pressure and velocity near the wall are decreased significantly in rear of the seat,but the pressure drop and velocity magnitude are very small in the upper of the valve central line.The flow resistance coefficient of the valve is 0.093.The maximum deformation and stress of the valve are 19.4 μm,70.8 MPa,which are located in the tip and side surface of the seat,respectively.These deformation and stress are within the allowable ranges.

关 键 词：闸阀 高压 核电 流固耦合 流阻系数 

分 类 号：S277.9[农业科学—农业水土工程] TH134[农业科学—农业工程]