消能锥形阀过流状态研究与优化

消能锥形阀是一种用于中、高水头下的消能控流阀门,其内部结构设计的好坏直接影响着控流效果。为探究消能锥形阀在不同开度下,过流流量及内部流场的变化情况。进行了模型试验与CFD数值模拟计算,试验中发现开度从100%关至85%时出现了流量反而上升、进口压力下降的情况。利用CFD数值模拟的方法对内部流场进行了可视化研究。研究结果表明,在全开状态下锥形阀内部存在以下问题:过强的局部高速高压区域、低速流动死区范围过大、涡流区过度影响高速过流部分。并对锥形阀进行了一定的结构改进,优化了其内部流场情况。

Flow condition study and optimization of energy dissipating fixed cone valve

Energy dissipating fixed cone valve is used under medium or high water head,and the design of its internal structure directly affects its flow control efficiency.To study the changes of the valve's internal flow field and flow rate when the closed switch is opened to varied degrees,the writer conducted model tests and CFD numerical simulation computation,and found that when the switch was turned down from 100 ％ open to 85 ％ open,the flow rate increased and pressure around the inlet dropped.The writer also conducted visualization research on the valve's internal flow field through CFD numerical simulation,and the results showed the following problems inside the valve when the switch was fully open:excessively high speed and high pressure in partial areas,extensive low-flow stagnation areas,excess impact of eddy area on the high-speed flow area.Finally,the writer optimized the valve's structure and its internal flow field.