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Effect of vane profile on hydraulic energy recovery turbines performance |
Yang Junhu,Wang Xiaohui |
(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China) |
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Abstract Taking 3 hydraulic energy recovery turbines as objects,three types of vane profiles of turbine runners with different blade inlet angles and wrap angles were designed while other hydraulic geome-trical parameters and rotational speed fixed.Numerical simulations were carried out for turbines by computational fluid dynamics software Fluent.The simulation results show that the vortex in turbine runner vane profile 1 is weak,the relative velocity and pressure distribution of turbine runner vane profile 1 are more accordant than that of turbine runner vane profile 2 and 3,and turbine runner vane profile 3 is the worst at the best efficiency point.Its best efficiency of turbine runner vane profile 1 is 1% and 2% better than that of turbine runner vane profile 2 and 3 approximately.The head and efficiency relationship of these three turbine runners are H2>H3>H1,η1>η2>η3 at smaller flow rate,while H2>H1>H3,η3>η2>η1 at larger flow rate.The results also show that there is a combination of the optimal blade inlet angle and wrap angle while other hydraulic geometrical parameters fixed.There exists relative eddy at turbine runner inlet near the pressure surface.The head of turbine runner vane profile 3 is low under the same flow rate.Larger the blade wrap angle is,lower the turbines efficiency is at larger flow rate.
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Received: 14 March 2011
Published: 30 July 2011
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