对称半螺旋形吸水室对多级离心泵汽蚀性能的影响研究

Cavitation Research of Segmental Multistage Centrifugal Pump Based on the Hydraulic Design of Symmetrical Spiral Circular Suction Chamber

为提高环形吸水室的节段式多级离心泵的抗汽蚀性能,采用对称分布的半螺旋结构对环形吸水室进行水力优化,并对优化前后的多级离心泵进行数值计算和流场分析,最后进行汽蚀试验验证。研究结果表明,优化后的环形吸水室的流场结构有了较明显的改善,增大了首级叶轮叶片入口边的压强,提高了泵的抗汽蚀性能。经汽蚀试验验证,泵的汽蚀性能完全达到设计要求。

In order to improve the anti-cavitation performance of a segmental multistage centrifugal pump with a circular suction chamber, the hydraulic optimization of suction chamber was carried out by using the spiral structure with symmetrical distribution instead of the circular structure, and the fow felds of the multistage centrifugal pump with and without optimization were analyzed by numerical simulation method, finally the cavitation test was carried out to verify the optimization of suction chamber. The results show that the fow felds of the suction chamber with optimization are signifcantly improved, the pressure at the impeller blades entrance is increased, and the anti-cavitation performance of the pump is improved. The cavitation test proves that the pump cavitation performance fully meets the design requirements.