稳压器喷雾阀阀芯倒角尺寸对流动的影响

V型旋转式阀芯具有流阻小,切断性能好,调节精度较高的特点。为了减小阀芯旋转时流体在阀芯和阀座棱边上剪切力以及阀门形阻系数,通常在阀芯的棱边上加工倒角来达到此目的,研究稳压器喷雾阀V型阀芯棱边不同倒角尺寸时,阀内流体流动时在阀芯与阀座上的产生的剪切力大小,以及阀芯棱边取不同倒角尺寸时对流动的各参数的影响。采用CFD软件fluent,基于RANS方程,采用有限体积法进行空间离散,使用K-ε湍流模型和SIMPLE算法,针对阀芯不同的倒角尺寸,计算稳压器喷雾阀V型阀芯在关闭时阀门的体积流量,湍流参数,壁面剪切力,形阻系数等各种参数。得到阀芯倒角对流动参数的影响规律。

Relationship between Chamfer of V-ball Disc and Flow Parameter

The V-ball disc regulating valve is used widely in the fluid industry because of its advantages such as low shape resistance coefficient,good fluid-shear ability and high controlling accuracy. In order to reduce the wall shear stress on the disc and disc seat during the fluid flow inside the valve,its the disc edge needs to be chamfered.The V-ball disc is used for the presserizer spray control valve in the nuclear power station to regulate the flow. In order to find the relationship between the chamfer of the disc and the flow parameters,3D numerical simulations are carried out based on the RANS method and CFD software FLUENT which is built on finite volume method and K-ε and SIMPLE solver algorithm is employed during the calculations. From the numerical solution,it turns out that the chamfer on the edge of the V-ball disc increases with the increase of the volume flow rate,but reducing the shape resistance coefficient,increases the wall shear stress locally on the disc and disc seat.