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Effect of Blade Cambering on Dynamic Stall in View of Designing Vertical Axis Turbines

Ouro, P; Stoesser, T; Ramirez, L; (2018) Effect of Blade Cambering on Dynamic Stall in View of Designing Vertical Axis Turbines. Journal of Fluids Engineering , 140 (6) , Article 061104. 10.1115/1.4039235. Green open access

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Abstract

This paper presents large eddy simulations (LESs) 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 LESs. 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 analyzed by subjecting a NACA 4412 airfoil to the same flow and pitching motion conditions. Flow visualizations 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 counterparts. This may translate into increased performance and lower fatigue loads when using cambered airfoils in the design of vertical axis turbines (VATs) operating at low tip-speed ratios.

Type: Article
Title: Effect of Blade Cambering on Dynamic Stall in View of Designing Vertical Axis Turbines
Open access status: An open access version is available from UCL Discovery
DOI: 10.1115/1.4039235
Publisher version: https://doi.org/10.1115/1.4039235
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Technology, Engineering, Mechanical, Engineering, IMMERSED BOUNDARY METHOD, LARGE-EDDY SIMULATION, WIND TURBINE, TURBULENCE STATISTICS, NUMERICAL-SIMULATION, NACA-0012 AIRFOIL, BUBBLE PLUMES, FLOW, DEEP, SEPARATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10058266
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