Optimization of Blade Deflection Angle of Vertical-Axis Turbine for Tidal Current Energy Conversion

摘要

A mathematic optimization model was presented to enhance the powerrncoefficient of vertical-axis turbine for tidal current conversion byrnadjusting the blades’ deflection angle. To do this, the blade deflectionrnangle was expressed as a multinomial of Hicks-Henne functions. Therncoefficients of Hicks-Henne functions, which are design variables, werernworked out by the revolving orientation method to achieve the maximalrnpower coefficient. Double-multiple streamtube method was adopted torncalculate the hydrodynamic performance of turbine. Example resultsrnindicate that the power coefficient of optimized turbine is evidentlyrnhigher than that of cycloidal turbine. In addition, the features wererndescribed that the optimal deflection angle and attack angle changernalong with azimuth during a period. At last, the sample results wererncompared between moment-controlled model and the current model,rnand the theoretical basis of moment-controlled model was analyzed.