Numerical investigation and optimization of the fish mortality in an axial-flow pump based on a blad

• 作 者: PAN Qiang ZHANG De-sheng SHI Wei-dong ZHAO Ru-ijie VAN ESCH B.P.M
• 机 构: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, 301 Xuefu Road, Z
• 出 处: 第二十九届全国水动力学研讨会
• 发表日期: 2018年7期
• 关键词: blade strike model axial flow pump fish mortality hydraulic performance cavitati

　　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.