EFFECT OF VARIABLE DROOP LEADING EDGE ON HYDRODYNAMIC CHARACTERISTICS OF H-TYPE VERTICAL AXIS HYDRAULIC TURBINE

Zhou Donghai; Sun Xiaojing

doi:10.19912/j.0254-0096.tynxb.2021-0259

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (9) : 391-401. DOI: 10.19912/j.0254-0096.tynxb.2021-0259

EFFECT OF VARIABLE DROOP LEADING EDGE ON HYDRODYNAMIC CHARACTERISTICS OF H-TYPE VERTICAL AXIS HYDRAULIC TURBINE

Zhou Donghai, Sun Xiaojing

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Abstract

This paper aims at improving the efficiency of the H-type vertical axis hydraulic turbine by using the blade with variable droop leading edge. The two dimensional URANS numerical simulations were conducted, and the hydrodynamic performance of this new type of vertical axis hydraulic turbine was numerically simulated by combining overset mesh and dynamic mesh. The performance of the vertical axis hydraulic turbine with the variable droop leading edge at different tip speed ratios was analyzed, and the effects of the flap angle and flap length on the power-extraction efficiency of the vertical axis hydraulic turbine were also studied. From the simulation results, it could be seen that when the blade rotates to different positions, the variable droop leading edge could change the angle of attack and the flow separation on the suction surface was reduced. The dynamic stall characteristics of the blade could also be improved. The variable droop leading edge is proved to be beneficial to the power generation, and especially at lower tip speed ratio, the operating range of the H-type vertical axis hydraulic turbine is expanded.

Key words

hydroelectric power / computational fluid dynamics / conversion efficiency / variable droop leading edge / vertical axis

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Zhou Donghai, Sun Xiaojing. EFFECT OF VARIABLE DROOP LEADING EDGE ON HYDRODYNAMIC CHARACTERISTICS OF H-TYPE VERTICAL AXIS HYDRAULIC TURBINE[J]. Acta Energiae Solaris Sinica. 2022, 43(9): 391-401 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0259

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