10.1007/s40095-021-00414-z

Study on the effects of winglets: wind turbine blades having circular arc blade section profile

  • Nafiz Ahmed Khan*1,
  • Md Quamrul Islam1,
  1. Department of Mechanical Engineering, Military Institute of Science and Technology, Dhaka, 1216, BD

Published in Issue 2021-08-02

How to Cite

Khan, N. A., & Islam, M. Q. (2021). Study on the effects of winglets: wind turbine blades having circular arc blade section profile. International Journal of Energy and Environmental Engineering, 12(4 (December 2021). https://doi.org/10.1007/s40095-021-00414-z
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Abstract

Abstract Performance enhancement of horizontal axis wind turbine with circular arc blade section has been investigated both experimentally and computationally using upstream and downstream winglet configurations. A computational study is performed for a three-blade rotor of 0.5-m-diameter in ANSYS Fluent to identify the optimum values for cant angle and twist angle. Findings from the numerical analysis are then utilized as inputs for the experimental study. The height of the winglet is selected as 6% of the rotor radius while cant angle and twist angle are 55° and 0°, respectively. Power and thrust coefficient are measured for both the upstream and downstream winglet orientations at different pitch angles ( φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi$$\end{document} ) and tip speed ratios ( λ ). Results show that upstream winglet provides 9.79% extra power in comparison with reference model at design tip speed ratio (TSR = 5) and zero pitch angle. Improved performance is obtained with downstream winglet achieving almost 15% additional power. Conversely, for all the pitch angles, power decreases as λ 0.1 beyond the design tip speed.

Keywords

  • Wind turbine rotor,
  • CABS,
  • Winglets,
  • Power coefficient,
  • Thrust coefficient

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