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《第二十九届全国水动力学研讨会论文集(上册)》2018年
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Numerical investigation and optimization of the fish mortality in an axial-flow pump based on a blade strike model

PAN Qiang  ZHANG De-sheng  SHI Wei-dong  ZHAO Ru-ijie  VAN ESCH B.P.M  
【摘要】:In an effort to avert fish injury and mortality during passage through pumping stations,a validated blade strike model for fish damage is integrated into a CFD-based design method for pumps.This paper describes the design of a fish-friendly axial-flow pump.As a first step,the hydraulic and fish handling performance of an existing,axial flow pump is assessed.This pump employs a conventional,high specific speed impeller with a diameter of 1.26 m and operates at a head of 4 m.Calculated hydraulic performance is in close agreement with measurements.As expected,the calculated blade strike mortality rate is up to 65%at design condition for rainbow trout with a length of 150 mm.Subsequently,the design of the pump was adapted step-wise in order to reduce fish mortality without compromising its hydraulic performance.In the final design,the risk of fish mortality has reduced considerably to a calculated value of 15%.Results show that the performance of the fish-friendly pump is still acceptable for practical application.

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