球阀流场的数值模拟与分析

首先应用前处理软件GAMBIT生成简化计算模型，并采用T-Grid格式划分网格，利用FLUENT软件，对球阀流场三维分离流动进行模拟．分析不同阀芯开口度下的阀门内部流场，并提出如下结论：球阀开口度为20°时在球阀内形成了漩涡流动，整个流场以回流为主，有一对大小相等方向相反的漩涡控制阎芯的流场；当球阀开口度继续增大时，漩涡尺寸随开口度增大而持续增大；当球阎开口度大于70°时，整个流动区域漩涡流动全部消失．球阀流量系数随球阀开口度的增大而增大并呈抛物线状，开口度越大，增长的速度越快．

Numerical Simulation and Analysis on Flow Field of Ball Valve

This paper firstly used the pre-processing software GAMBIT to generate simplified calculation model and adopted the T-Grid format to divide the model into grid, then used FLUENT software to simulated calculation for the three-dimensional separated flow of electric ball valve. On the basis analyzed the internal flow field of different valves opening and gave several conclusions as follows ： when the opening of the ball valve is equal to 20°, the vortex appears and the entire flow field is controlled by reversed flow and there is a pair of equal size vortex to control the flow field of valve core, it is the opposite direction. When the ball valve opening degree of continued increases, the vortex size increases with the opening degree of sustained increases. When the ball valve opening degree is greater than 70° the entire flow of the vortex flow is disappeared. The flow coefficient increases with increasing opening degree as parabola- shaped, the greater the opening degree, the faster growth.