密实度对垂直轴潮流能水轮机水动力性能影响分析

Impact Analysis of Density on Hydrodynamic Performance of Vertical Axis Tidal Energy Turbine

为研究密实度对垂直轴潮流能水轮机水动力性能的影响,从水轮机直径、叶片数及叶片弦长三个方面考虑密实度的变化,采用CFD数值模拟方法得到不同密实度的水轮机的水动力性能,并总结出规律。研究结果表明:推力系数和侧向力系数均值均随密实度的增加而增加,而能量利用率均值随密实度的变化规律与速比相关;能量利用率、推力系数和侧向力系数的波动幅值随密实度的改变而发生变化,变化规律与导致密实度变化的参数相关。研究成果可为垂直轴潮流能水轮机的选型提供一定的参考依据。

In order to study the influence generated by the density for the hydrodynamic performance of the vertical axis tidal energy turbine,the change of density is considered from three aspects of turbine diameter,number of blades and chord length of blade.The hydrodynamic performance of the turbines with different density is obtained by CFD numerical simulation,and the regulation is summarized.The research results showed that the mean values of thrust and lateral force coefficients raise along with the increase of compactness,and the change regulation of the mean value of energy utilization rate along with the density is related to the tip speed ratio.Meanwhile,the fluctuation amplitudes of energy utilization rate,thrust and lateral force coefficients change while the density alters,and the regulation of change is related to the parameters that lead to the change of density.The research findings can provide the reference for the selection of vertical axis turbines.