潮流能导管涡轮发电装置水动力学特性影响因素

INFLUENCING FACTORS OF HYDRODYNAMIC PERFORMANCE OF TIDAL POWER DUCTED TURBINE CURRENT ENERGY GENERATOR

采用自主研发的新型翼型设计一种潮流能导管涡轮发电装置,通过计算流体力学(CFD)技术对该装置进行水动力学性能研究。从翼型、导管长径比、导管收缩比、转子与导管的叶尖间隙及导管截面形状等方面分析其对涡轮水动力学性能的影响。研究结果表明:新型翼型具有良好的水动力学性能。相比无导管的裸涡轮,导管能显著提高涡轮的输出功率和轴向推力。随着导管长径比的减小和收缩比的增大,涡轮的输出功率和轴向推力也随之增大。导管与转子之间的间隙越小,涡轮的水动力学性能越好。此外,导管截面形状对涡轮的水动力学性能有较大影响,在所采用的4种截面形状中,圆弧切面形状具有较好的性能。研究成果为潮流能导管涡轮发电装置的设计提供了参考依据。

A tidal power ducted turbine generation device was designed based on hydrofoil developed independently converter.The hydrodynamic characteristics of the device were studied using computational fluid dynamics(CFD).The influences of hydrofoil,duct aspect ratio,duct contraction ratio,tip clearance between duct and rotor,and cross section shape of duct on the hydrodynamics of the turbine were analyzed.The study results show that the new hydrofoil has good hydrodynamic performance.Compared with the bare turbine,the duct can significantly increase output power and axial force of the turbine.The output power and axial force increase with reducing of the aspect ratio and increasing of the contraction ratio.The smaller the tip clearance between the duct and rotor is,the better the hydrodynamic performance is.Moreover,the cross section shape of duct has a great influence on the turbine hydrodynamics;the duct with tangent arc cross section shape has better performance among the four shapes ducts presented in this study.The research provides a reference for the design of tidal power ducted turbine generation devices.