含气率对混流泵压水室流场的影响分析

Impacts of Void Fraction on the Volute Flow Field of Mixed Flow Pump

为了研究含气率对混流泵压水室内的流场影响,以某厂生产的导叶式混流泵为研究对象,应用商业CFD软件进行数值模拟分析,得到在不同份额含气率条件下压水室内部的流场特性。结果表明:混流泵压水室出口处的流速要比其他位置上的流速大,不符合压水室出口处能量转换的定律,而且随着含气率的增大混流泵压水室在径向流道方向上的压力也在不断增大,并在压水室外壁上出现局部的高压现象,这对混流泵压水室强度有一定的考验。在靠近导叶出口处的压水室内有大量的气体聚集,影响混流泵的运行稳定性。

In order to study the effects of void fraction on the volute flow field,a mixed flow pump with guide vane was investigated by using the commercial CFD software. The volute flow fields with different void fractions were obtained and compared. The results showed that the flow velocity at the volute exit is higher than in other locations. With the increase in void fraction,the volute pressure increases in the transverse direction of the flow,resulting in localized high pressure on the volute outer walls and challenging the volute strength. Near the guide vane exit,there exists a significant gas accumulation,affecting the operation stability of the mixed flow pump.