Effect of Swept Angle on Aerodynamic Force Generation of a Swept Twist Round (STR) Vertical Blade

ABSTRACT: This paper discusses the effect of blade's swept angle towards the aerodynamic forces generation of Vertical Axis Wind Turbine (VAWT). In the rotating condition, normal force coefficient (Cn) and tangential force coefficient (Ct) are calculated by using Blade Element Momentum Theory (BEMT)-based multiple streamtube model. Multiple streamtube model calculation for three different tip speed ratios (TSR) suggests that the variation of Cn and Ct are up to 3.3 times less for the model with higher swept angle. For the startup condition, Computational Fluid Dynamics (CFD) analysis using ANSYS CFX is conducted to calculate the torque variation at twelve different blade positions relative to the wind direction for seven different models. Unlike the Gorlov mathematical model for a helical turbine, CFD analysis predicted that the average torque is increasing as the swept angle increases. Meanwhile, the variation of torque is up to 10 times less for the models with higher swept angle.
Keywords: Wind turbine, BEMT, VAWT, CFD, Gorlov model, swept angle
Author: Nanang Mahardika
Journal Code: jptmesingg170004

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