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Energies 2014, 7(12), 7893-7914; doi:10.3390/en7127893

Experimental and Numerical Study of the Aerodynamic Characteristics of an Archimedes Spiral Wind Turbine Blade

1
School of Mechanical Engineering, Pusan National University, Jangjeon-dong, Geumjeong-Gu, Busan 609-735, Korea
2
Department of Engineering Research, Eastern Star Cooperation Real Time Services (ESCO RTS), Doosanventuredigm, B112, Pyeongchon-Dong, 126-1, Dongan-Gu, Anyang, Gyeonggi-Do 431-070, Korea
3
The Archimedes, Looiershof 30, Rotterdam 3024 CZ, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 9 May 2014 / Revised: 29 October 2014 / Accepted: 14 November 2014 / Published: 26 November 2014
(This article belongs to the Special Issue Wind Turbines 2014)
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Abstract

A new type of horizontal axis wind turbine adopting the Archimedes spiral blade is introduced for urban-use. Based on the angular momentum conservation law, the design formula for the blade was derived using a variety of shape factors. The aerodynamic characteristics and performance of the designed Archimedes wind turbine were examined using computational fluid dynamics (CFD) simulations. The CFD simulations showed that the new type of wind turbine produced a power coefficient (Cp) of approximately 0.25, which is relatively high compared to other types of urban-usage wind turbines. To validate the CFD results, experimental studies were carried out using a scaled-down model. The instantaneous velocity fields were measured using the two-dimensional particle image velocimetry (PIV) method in the near field of the blade. The PIV measurements revealed the presence of dominant vortical structures downstream the hub and near the blade tip. The interaction between the wake flow at the rotor downstream and the induced velocity due to the tip vortices were strongly affected by the wind speed and resulting rotational speed of the blade. The mean velocity profiles were compared with those predicted by the steady state and unsteady state CFD simulations. The unsteady CFD simulation agreed better with those of the PIV experiments than the steady state CFD simulations. View Full-Text
Keywords: Archimedes spiral wind blade; particle image velocimetry; tip vortex; wake; computational fluid dynamics (CFD); unsteady analysis Archimedes spiral wind blade; particle image velocimetry; tip vortex; wake; computational fluid dynamics (CFD); unsteady analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, K.C.; Ji, H.S.; Kim, Y.K.; Lu, Q.; Baek, J.H.; Mieremet, R. Experimental and Numerical Study of the Aerodynamic Characteristics of an Archimedes Spiral Wind Turbine Blade. Energies 2014, 7, 7893-7914.

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