基于CFD技术的阀门内流道优化

Optimization of the valve internal flow channel based on CFD approach

应用CFD软件FLUENT,以RANS方程为控制方程,以有限体积法作空间离散,采用k-ε湍流模型和SIMPLE或PISO算法,对直角截止阀内流场进行了三维数值模拟,优化设计其内流道。通过计算该型阀门的关键几何形状和尺寸对湍动能强度等流动特征的影响,对阀门内流道优化得到如下结论:直角截止阀的开度应提高到喉部有效通流直径的一半以上;适当减小阀杆直径,可以降低阀芯整体所受流体激振力;应采取措施提高阀杆特定方向刚度以减小阀芯振动;在直角截止阀内转角应用导流壁,可获得显著的减阻减振效果。提出了这类阀门内流道设计的减阻减振降噪方案,并得到了初步的实验验证。

In order to improve the flow channel within an angle stop valve. 3D numerical simulations are carried out based on PANS method and by using FLUENT solver. The finite volume method, standard k- ε model and SIMPLE or PISO algorithm are employed during the calculations. With the numerical results about the influence of the key geometrical shapes and sizes of the valve upon the turbulent kinetic energy, some renovations of the internal flow channel are proposed. It turns out that the distance between the valve plug and throat should reach more than a half of the effective throat diameter for a low-noise optimization. Reducing stem diameter can effectively depress the vibration force on the valve plug by fluid. The bending stiffness of the valve stem in the particular direction should be increased to reduce the vibration of the valve plug. A significant reduction of drag and vibration can be obtained, through the application of the diversion-wall on the inner comer of the angle stop valve. An optimized design of internal flow channel of such kind of valve is proposed to reduce the drag, vibration and noise. It has been rudimentarily verified by the experimental results.