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Effect of blade cambering on dynamic stall in view of designing vertical axis turbines OPEN ACCESS

[+] Author and Article Information
Pablo Ouro

Research Software Engineer, Cardiff School of Engineering, Cardiff, CF24 3AA, UK
ourobarbap@cardiff.ac.uk

Thorsten Stoesser

Professor, Cardiff School of Engineering, Cardiff, CF24 3AA, UK
stoesser@cardiff.ac.uk

Luis Ramirez

Associate Lecturer, Universidade da Coruña, Campus de Elviña, A Coruña, 15071, Spain
luis.ramirez@udc.es

1Corresponding author.

ASME doi:10.1115/1.4039235 History: Received June 26, 2017; Revised January 12, 2018

Abstract

This paper presents large-eddy simulations of symmetric and asymmetric (cambered) airfoils forced to undergo deep dynamic stall due to a prescribed pitching motion. Experimental data in terms of lift, drag, and moment coefficients are available for the symmetric NACA 0012 airfoil and these are used to validate the large-eddy simulations. Good agreement between computed and experimentally observed coefficients is found confirming the accuracy of the method. The influence of foil asymmetry on the aerodynamic coefficients is analysed by subjecting a NACA 4412 airfoil to the same flow and pitching motion conditions. Flow visualisations and analysis of aerodynamic forces allow an understanding and quantification of dynamic stall on both straight and cambered foils. The results confirm that cambered airfoils provide an increased lift-to-drag ratio and a decreased force hysteresis cycle in comparison to their symmetric counterpart. This may translate into increased performance and lower fatigue loads when using cambered airfoils in the design of vertical axis turbines operating at low tip-speed ratios.

Copyright (c) 2018 by ASME; use license CC-BY 4.0
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