不同导叶数对立式斜流泵水力特性影响的研究

Influence of different guide vane numbers on hydraulic characteristics of vertical oblique flow pump

为探索立式斜流泵导叶片数对水泵水力性能的影响,选择比转数ns=542.3的模型泵为研究对象,分别对双向FSI模型和单一流体域不同模型进行了比较研究。结果表明,双向FSI模型更加适合模拟斜流泵,能反映泵内水体真实流动规律;随着导叶片数的增加,泵内水力损失逐渐增大,当导叶数增加到7片时,泵内水力损失最大,占总扬程的15.20%;当导叶为3片时,泵内水力损失最小,只占总扬程的3.34%,且导叶出口速度分布以及导叶表面静压分布都较为合理。研究结果可为立式斜流泵导叶数的选择提供参考。

For investigating influence of different guide vane numbers on hydraulic characteristics of vertical oblique flow pump, we conduct comparative study on model pump with specific speed of 542. 3 using bidirectional FSI model and single fluid domain model. The results indicate that the bidirectional FSI model is more appropriate to simulate the vertical oblique flow pump as it can reflect the inner flow field more accurately. The pump hydraulic loss increases with the increase of the guide vane num-ber. The pump hydraulic loss increases and is up to 15. 20% of the total water lift when the guide vane number is increased to 7;the hydraulic loss of pump reaches the lowest when the guide vane number is reduced to 3, accounting for only 3. 34% of the total water lift, and the exit velocity distribution of guide vane and static pressure at the guide vane surface are rational in this case.