Taguchi-based Optimization of Flanged Convergent-convergent Duct for Improving Micro Horizontal-axis Wind Turbine Performance

A numerical optimization study was performed to determine an improved flanged converging–diverging duct geometry for enhancing the power performance of a micro horizontal-axis wind turbine (HAWT). The Taguchi method was employed for optimization. Five duct geometric parameters were considered control factors in the Taguchi method: the nozzle length, the nozzle angle, the diffuser angle, the flange length, and the flange angle. The optimization target was defined as the maximum rotor power coefficient (CP,max). Analysis of the Taguchi results revealed that the flange length exerted the most significant influence on CP,max among the investigated parameters. The optimum duct configuration achieved CP,max = ۰.۷۷ at ۱۰ m/s and ۰.۷۶ at ۱۶ m/s, respectively, representing increases of ۴۸.۴% and ۷۱.۴% compared with those of the worst duct configuration. In addition, the optimized duct accelerated the throat airflow velocity by ۶۷.۲% at ۱۰ m/s and ۶۵.۵% at ۱۶ m/s. With regard to the convergent nozzle in the duct, flow field analysis indicated that a smaller nozzle length and larger nozzle angle are favorable for accelerating the airflow. In addition, a longer flange with a flatter angle facilitates faster airflow movement through the wind turbine.

کلیدواژه ها:

Micro horizontal-axis wind turbine ، Flanged convergent-divergent duct ، Taguchi method ، Optimization ، Numerical simulation