为明确诱导轮长短叶片位置对高速离心泵汽蚀性能的影响，选择5种短叶片不同位置的诱导轮前置于高速离心泵前，对此离心泵的全流道进行了数值模拟，并针对前置5种不同诱导轮的情况进行了外特性实验和汽蚀实验。在数值模拟时，采用雷诺时均N-S控制方程和标准惫一￡湍流模型。通过数值模拟，得到了5种短叶片不同位置的诱导轮离心泵流场的分布情况，得到了短叶片在诱导轮中的最佳位置为距离长叶片进口处约0．45D处。通过外特性及汽蚀特性的实验研究，得到了它们的扬程流量特性及汽蚀特性曲线，由实验可知：短叶片的位置对扬程和效率的影响不大，但对汽蚀的影响较为显著，在前置诱导轮3的情况下高速离心泵的汽蚀特性最好。通过数值模拟和试验的分析比较，得到了短叶片在诱导轮中的最佳位置。
In order to know inducer-short blade position influence on cavitation performance of high speed centrifugal pump, five inducers are designed and assembled before the centrifugal impeller. The whole flow inner the centrifugal pump with five inducers is respectively simulated. And the correspondence external performance and cavitation performance are done. The time-averaged N S equation and the modified k - ε turbulent model are adopted during calculation. The ftow inner the centrifugal pump with different inducers is calculated, and the best inducer is found. The distance of its short blades far fl＇om the long blades is about 0.45D. Through the external characteristics and experimental study of cavitation, the head flow characteristics and cavitation characteristic curve is got. The experiment results show that short blade position＇s effect on head and efficiency is not significant, otherwise, the effect on cavitation is significant. And in the case of front inducer 3, cavitation performance of high-speed centrifugal pump is the best. Comparison by numerical simulation and experimental analysis, the best position of short blade in inducer is got.
参考文献
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