Abstract:A large number of fish suffer from injury and mortality when passing through a traditionally designed pumping station. In order to improve the survival rate when fish passing through the flow channels in a pumping station, fish mortality rates are predicted under various operational conditions in a conventional axial-flow pump by using a blade strike model which is with a better accuracy against experimental data. It is shown that the fish mortality rate at the design point is up to 68% theoretically in that pump. Based on this model, a fish-friendly hydraulic design approach is proposed for an axial-flow pump to have better fish survival rate, and effects of a few design parameters on the rate are analyzed. It is turned out that number of blades and rotational speed are two major factors influencing blade strike probability. Because the pump head is almost twice sensitive to the rotational speed than to the number of blades, the impeller is kept having two blades to reduce the blade strike probability for fish. The chord length of blade is increased to cope with the head drop caused by reduced number of blades. To limit the axial length of pump, the increased proportion of chord length is a little bit small. The forward swept and extended leading edge can reduce strike velocity, i.e. the velocity component perpendicular to the leading edge, significantly, thus the leading edge is the primary factor affecting strike mortality rate, while the thickened leading edge is the secondary factor for the rate. However, these two factors can induce a stronger radial velocity component, causing a low hydraulic efficiency and poor cavitation performance. The fish mortality rate is all below 30% at any operating points, and the rate has been declined to 13% from initially 68% at the design point as fish passing through the fish-friendly pump, thus fish survival is remarkable. This study can provide a reference for development of fish-friendly axial-flow pump and its application in pumping stations.
潘强, 施卫东, 张德胜, 赵睿杰. 泵站用轴流泵鱼友好型设计及鱼类存活率预测[J]. 排灌机械工程学报, 2017, 35(1): 42-49.
PAN Qiang, SHI Weidong, ZHANG Desheng, ZHAO Ruijie. Design and fish survival rate prediction of fish-friendly axial-flow pump for pumping stations. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(1): 42-49.
[1]VON RABEN K. Zur frage der beschädigung van fischen durch turbinen[J]. Die wasserwirtschaft, 1957(4):97-100.[2]NEITZEL D A, RICHMOND M C, DAUBLE D D, et al. Laboratory studies on the effects of shear on fish:final report 2000[R]. Springfield, USA: US Dept. of Energy Idaho Operations Office, 2000.[3]HOGAN J. The effects of high vacuum on fish[J]. Transactions of the American Fisheries Society, 1941, 70(1): 469-474.[4]CADA G F, COUTANT C C, WHITENY R R. Development of biological criteria for the design of advanced hydropower turbines[R]. Springfield, USA: US Dept. of Energy Idaho Operations Office, 1997.[5]DENG Zhiqun, CARLSON T J, PLOSKEY G R, et al. Evaluation of blade-strike models for estimating the biological performance of Kaplan turbines[J]. Ecological modelling, 2007,208(2/3/4): 165-176.[6]DENG Zhiqun, CARLSON T J, DAUBLE D D, et al. Fish passage assessment of an advanced hydropower turbine and conventional turbine using blade-strike modeling[J]. Energies, 2011,4(1): 57-67.[7]FERGUSON J W, PLOSKEY G R, LEONARDSSON K, et al. Combining turbine blade-strike and life cycle models to assess mitigation strategies for fish passing dams[J]. Canadian journal of fisheries and aquatic sciences, 2008,65(8):1568-1585.[8]PLOSKEY G R, CARLSON T J. Comparison of blade-strike modeling results with empirical data[R]. Richland, USA: Pacific Northwest National Laboratory, 2004.[9]DENG Z, CARLSON T J, PLOSKEY G R, et al. Evaluation of blade-strike models for estimating the biological performance of Large Kaplan Hydro Turbines[R]. Richland, USA: Pacific Northwest National Laboratory, 2005.[10]VAN ESCH B P M. Fish injury and mortality during passage through pumping stations[J]. Journal of fluids engineering, 2012,134(7):1-9.[11]LI Cheng, VAN ESCH B P M. Blade interaction forces in a mixed-flow pump with vaned diffuser[C]//Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting. Vail, USA: ASME, 2009:165-173.[12]VAN ESCH B, CHENG Li. Unstable operation of a mixed-flow pump and the influence of tip clearance[C]//Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. Vail, USA: ASME, 2011: 79-87.[13]VAN ESCH B P M, SPIERTS I L Y. Validation of a model to predict fish passage mortality in pumping stations[J]. Canadian journal of fisheries and aquatic sciences, 2014,71(12):1910-1923.[14]AMARAL S V, HECKER G E, DIXON D A. Designing leading edges of turbine blades to increase fish survival from blade strike[R]. Palo Alto, USA: Electric Power Research Institute, 2011.[15]KRAKERS L A, KRUYT N P, RUTJES H A. Full-scale validation of a comprehensive criterion to predict fish-friendliness of pumps[C]//Proceedings of ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Vail, USA: ASME, 2015: 1344-1357.[16]潘强, 张德胜, 施卫东. 基于叶片撞击模型的鱼友好型轴流泵优化设计[J]. 农业机械学报, 2015,46(12):102-108. PAN Qiang, ZHANG Desheng, SHI Weidong. Optimization design of fish-friendly axial-flow pump based on blade strike model[J]. Transactions of the CSAM, 2015,46(12):102-108.(in Chinese)[17]潘强, 施卫东, 张德胜. 鱼友好型轴流泵流场数值分析及汽蚀性能优化[J]. 农业机械学报, 2016,47(4):15-21. PAN Qiang, SHI Weidong, ZHANG Desheng. Numerical analysis of flow field and cativation performance optimization of fish-friendly axial-flow pump[J]. Transactions of the CSAM, 2016,47(4):15-21.(in Chinese)[18]鄢碧鹏, 汤方平. 叶片数变化对轴流泵性能影响的研究[J]. 扬州大学学报(自然科学版), 1998,1(3):53-55. YAN Bipeng, TANG Fangping. Study on the performance of axial-flow pump by changing the number of its blandes[J]. Journal of Yangzhou University(natural science edition), 1998,1(3):53-55.(in Chinese)[19]SHI Weidong, ZHANG Desheng, GUAN Xingfan, et al. Numerical and experimental investigation on high-efficiency axial-flow pump[J]. Chinese journal of mechanical engineering, 2010,23(1): 38-44.[20]张德胜, 施卫东, 张华, 等. 不同湍流模型在轴流泵性能预测中的应用[J]. 农业工程学报, 2012, 28(1): 66-71. ZHANG Desheng, SHI Weidong, ZHANG Hua, et al. Application of different turbulence models for predicting performance of axial flow pump[J]. Transactions of the CSAE, 2012,28(1): 66-71.(in Chinese)[21]卢纪富, 魏新利, 李杨. 轴流前弯叶轮叶顶流场特征分析[J]. 流体机械, 2010,38(6):6-10. LU Jifu, WEI Xinli, LI Yang. Charateristic of tip flow field of axial fan with forward-skewed rotor blade[J]. Fluid machinery, 2010,38(6):6-10.(in Chinese)[22]程成, 施卫东, 张德胜, 等. 后掠式双叶片污水泵固液两相流动规律的数值模拟[J]. 排灌机械工程学报, 2015,33(2):116-122. CHENG Cheng, SHI Weidong, ZHANG Desheng, et al. Numerical simulation of solid-liquid two-phase turbulent flow of swept-back double blades sewage pump[J]. Journal of drainage and irrigation machinery engineering, 2015, 33(2):116-122.(in Chinese)[23]施卫东, 邢津, 张德胜, 等. 后掠式叶片轴流泵固液两相流数值模拟与优化[J]. 农业工程学报, 2014,30(11): 76-82. SHI Weidong, XING Jin, ZHANG Desheng, et al. Numerical simulation and optimization of solid-liquid two-phase turbulent flow in back swept axial pump[J]. Transactions of the CSAE, 2014,30(11):76-82.(in Chinese)[24]邴浩,谭磊,曹树良. 叶片数及叶片厚度对混流泵性能的影响[J]. 水力发电学报, 2013,32(6):250-255. BING Hao, TAN Lei, CAO Shuliang. Effect of blade number and thickness on performance of mixed-flow pumps[J]. Journal of hydroelectric engineering, 2013, 32(6):250-255.(in Chinese)[25]金实斌, 曹璞钰, 王洋. 非均匀进流下喷水推进泵进流速度场的数值分析[J]. 排灌机械工程学报, 2016,34(2):115-121. JIN Shibin, CAO Puyu, WANG Yang. Numerical analysis on velocity field of water-jet pump under non-uniform inflow[J]. Journal of drainage and irrigation machinery engineering, 2016,34(2):115-121.(in Chinese)[26]张德胜, 李通通, 施卫东, 等. 轴流泵叶轮出口轴面速度和环量的试验研究[J]. 农业工程学报, 2012,28(7): 73-77. ZHANG Desheng, LI Tongtong, SHI Weidong, et al. Experimental investigation of meridional velocity and circulation in axial-flow impeller outlet[J]. Transactions of the CSAE, 2012,28(7):73-77.(in Chinese)[27]燕浩, 刘梅清, 赵文胜,等. 速度环量对大型轴流泵站水力性能的影响[J]. 中南大学学报(自然科学版), 2016, 47(6):2125-2132. YAN Hao, LIU Meiqing, ZHAO Wensheng, et al. Influence of velocity circulation on hydraulic performance of large axial-flow pumps station[J]. Journal of Central South University(science and technology), 2016,47(6):2125-2132.(in Chinese)