新型H型叶片潮流能水轮机不同翼型水动力性能分析

Analysis on hydrodynamic performances of different airfoils for new H-type blade of tidal current energy turbine

为了探究垂直轴潮流能水轮机转轮叶片翼型对其水动力性能的影响,在保持水轮机密实度相同的条件下,采用Fluent软件对4种不同翼型的H型直叶片潮流能水轮机进行了三维流场非定长数值模拟。通过4种H型叶片翼型对转轮动力扭矩特性和水能利用系数的影响,分析了潮流能水轮机水动力性能。结果表明,NACA0015翼型的水轮机单叶片动力扭矩最大值明显高于其他3种翼型;而整体转轮扭矩最大值取决于其不同的来流速度等运行工况。从整体上看,不对称翼型NACA4415的水轮机水能利用效率优于其他3种翼型。本研究为新型潮流水轮机的设计和翼型的选择应用提供了依据。

In order to study the impact from the runner blade airfoil of the vertical axis tidal current energy turbine on its hydrody- namic performance, the 3 - D unsteady flow field numerical simulations are made on four kinds of H-type runner blade airfoils of the vertical axis tidal current energy turbine with the software of Fluent under the condition of maintaining a same turbine density. Through the simulations made on the impacts from the four kinds of H-type blade airfoils on the dynamic torque characteristics of runners and the water power utilization coefficients, the hydrodynamic performance of the tidal current energy turbine is ana- lyzed. The result shows that the maximum dynamic torque of the single turbine blade with the airfoil of Type-NACA0015 is signif- icantly higher than those of the other three kinds of airfoils, while the maximum value of the whole runner torque depends on its operation conditions such as various incoming flow rates, etc. Generally, the water power utilization coefficient of the turbine with the Type-NACA4415 asymmetric airfoil is better than those of the turbines with the other three kinds of airfoils. This study provides a basis for the design of new type of tidal current energy turbine and the selection of its airfoil.