消能锥形阀内部结构优化与消能效果探讨

Internal structure and efficiency of energy dissipating fixed cone valve

消能锥形阀是一种消减上游过大液流能量的流体机械,其内部结构设计的好坏直接影响着消能效果。为了提高传统消能锥形阀的消能效果,提出在锥形阀阀芯后侧增加环形及锥形孔套,并探究其内部各消能部件对其消能效果的影响。利用计算流体力学(CFD)的数值模拟方法对三种不同内部结构的消能锥形阀进行了内部流场的模拟预测分析;并进行了水力模型试验对模拟结果进行精度验证。结果表明,消能锥形阀内部的锥形阀芯起到主要的消能作用,同时加入环形与锥形孔套均可以进一步的提高锥形阀的消能效果。

Energy dissipating fixed cone valve is a fluid device commonly used for dissipation of the excessive flow energy in the inflow, and its performance of energy dissipation depends on its internal structure. To improve the performance of its traditional design, we have installed a perforated annular casing and a perforated cone casing behind its valve core and studied how each energy dissipating component inside the valve of this modification affects the performances. A CFD numerical simulation method was adopted to predict and analyze the flows in the valve passages, and three different internal structures were examined and compared. Hydraulic model tests were conducted to verify the simulations. Results show that the cone core is a dominant component in energy dissipation and the total performance of the valve can be improved by installing a perforated annular casing and a perforated cone casing.