导流罩水动力特性及其对海流能机组的作用

Hydrodynamic characteristics of diffuser and its effect on tidal current turbine

为了提高海流能发电装置的能量捕获效率和有效的发电时间,采用FLUENT对9种结构型式导流罩进行数值模拟,并研究分析不同结构参数对翼型导流罩水动力性能的影响,在此基础上提出翼型导流罩的设计方法,最后基于该方法设计500 W海流能机组翼型导流罩。研究结果表明:相比于其他8种结构型式导流罩,翼型导流罩具有最佳的水动力性能;基于翼型导流罩设计方法设计的500 W海流能机组翼型导流罩不仅可以降低机组启动流速,而且可以在入口流速为额定流速的情况下提高62.1%的捕获功率。

In order to improve the efficiency of the current energy generator and effective generation time,the numerical simulation was carried out to investigate hydrodynamic performance of diffusers with different structures and analyze hydrodynamic performance of airfoil diffusers with variable parameters.On the basis,a design method of airfoil diffusers was presented,and an airfoil diffuser was designed for 500 W horizontal-axis tidal current turbine.The results show that compared with the other eight kinds of diffusers,the airfoil diffuser has the best hydrodynamic performance.Based on the design method of airfoil diffusers,the airfoil diffusers designed for 500 W horizontal-axis tidal current turbine can start at lower velocity and when the inlet flow velocity is the rated flow velocity,the turbine power can be increased by 62.1%.