水压锥阀内流场的数值模拟

Numerical simulation of flow field in hydraulic cone valve for water medium

在大雷诺数下应用雷诺应力湍流模型和计算流体力学方法对锥阀的内部流场进行数值仿真计算,着重研究阀的结构参数、入口压力、出口压力、阀口开度等对锥阀流场的影响.研究结果表明:阀的结构参数对流场的分布和气穴的产生有较大的影响.同时随着阀口开度、入口压力的增加,低压区逐渐扩大,压力逐渐下降,产生气穴的区域也随着扩大;而随着出口压力的升高,低压区的压力也逐渐升高,产生气穴的区域也逐渐缩小,对气穴有一定的抑制作用.

In the ease of large Reynolds number, Reynolds stress turbulence model and computational fluid dynamics was used to simulate the cone valve flow field and investigate emphatically the effect of structural parameters, inlet pressure, outlet pressure, and valve opening on the flow field within cone valve. The result showed that the structural parameters could greatly affect the distribution of flow field and the initiation of cavitation. With the increase of inlet pressure and valve opening, the low-pressure area gradually expanded, the pressure-declined, and the region of cavitation-expanded. However, with the increase of outlet pressure, the pressure of low-pressure region also gradually increased and the region of cavitation shrinked. So the increase of outlet pressure could suppress the initiation and development of the cavitation.