压水室布置凹槽对离心泵内部流动特性的影响

The flow field of the centrifugal pump was calculated by numerical calculation method based on the modification of the structure of the volute casing using passive flow control (PFC) technique. The influence of grooves on the pump performance and the internal flow of the computational domain under different operating conditions were analyzed. The results show that the proper groove structure can improve the pump performance under large flow conditions and expand the pump stability remarkably. Under the design condition, pump with grooved volute casing (GVC) can reduce the low pressure zone and the low velocity zone of the computational domain, and increase the static pressure value of the blade surface, especially near the inlet of the pressure side in the 70%~100% blade height, which has a positive effect on improving the anti-cavitation performance of the centrifugal pump. Under the 0.8Q_d ~1.4Q_d(designed flow), the pressure pulsation amplitude at the tongue of the grooved volute casing are significantly reduced, especially under the 0.8Q_d, the pressure pulsation periodicity is better, and the pulsation peak drop is up to 74.14%. The design of GVC plays an important role in absorbing the impact energy of fluid and stabilizing the flow in the centrifugal pump.