垂直轴潮流能水轮机叶片偏角优化

为提高垂直轴潮流能水轮机的能量利用率,建立了叶片偏角变化规律的数学优化模型.该模型是将一个运动周期内的叶片偏角相对位置角的函数关系表示成Hicks-Henne函数族的线性和,并将此函数关系带入叶轮的水动力计算中.然后以函数族的系数为设计参数,以水轮机能量利用率为目标函数,采用旋转方向法进行优化计算,以此得到最合理的叶片偏角变化规律.计算叶轮的流体动力性能时采用双盘面多流管法.最后,采用本文方法对摆线式水轮机进行了优化.算例结果显示,采用优化偏角的水轮机与原摆线式水轮机相比,能量利用率有较大提高,并且启动性能更好.

Optimization of blade deflection angle of vertical-axis tidal current turbine

To enhance the power coefficient of vertical-axis tidal current turbine,a mathematic optimization model for the blades’ deflection angle was presented.In this model,the function of blade deflection angle versus azimuth in one period of motion was expressed as a linear sum of a series of Hicks-Henne functions.And take the functional relation into computational process of hydrodynamic performance of rotor.To optimize deflection angle,the coefficients of those Hicks-Henne functions were taken as design variables,and the power coefficient as objective function.Revolving orientation method was applied as approach to achieve the optimization.Double-multiple streamtube method was adopted to calculate the hydrodynamic performance of turbine.At last,the cycloidal turbine was optimized for verification.Example results indicate that the power coefficient of optimized turbine is evidently higher than that of cycloidal turbine,and the optimized turbine is easier to start.