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Research Papers

Three-Dimensional and Rotational Aerodynamics on the NREL Phase VI Wind Turbine Blade

[+] Author and Article Information
Alvaro Gonzalez, Xabier Munduate

 CENER (National Renewable Energy Center), Ciudad de la Innovacion 7, Sarriguren, Navarra 31621, Spain

J. Sol. Energy Eng 130(3), 031008 (Jul 01, 2008) (7 pages) doi:10.1115/1.2931506 History: Received February 23, 2007; Revised December 04, 2007; Published July 01, 2008

This work undertakes an aerodynamic analysis over the parked and the rotating NREL Phase VI wind turbine blade. The experimental sequences from NASA Ames wind tunnel selected for this study respond to the parked blade and the rotating configuration, both for the upwind, two-bladed wind turbine operating at nonyawed conditions. The objective is to bring some light into the nature of the flow field and especially the type of stall behavior observed when 2D aerofoil steady measurements are compared to the parked blade and the latter to the rotating one. From averaged pressure coefficients together with their standard deviation values, trailing and leading edge separated flow regions have been found, with the limitations of the repeatability of the flow encountered on the blade. Results for the parked blade show the progressive delay from tip to root of the trailing edge separation process, with respect to the 2D profile, and also reveal a local region of leading edge separated flow or bubble at the inner, 30% and 47% of the blade. For the rotating blade, results at inboard 30% and 47% stations show a dramatic suppression of the trailing edge separation, and the development of a leading edge separation structure connected with the extra lift.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cn versus AOA for the 2D profile and four parked blade span stations

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Figure 2

Cp versus chord location for the 2D profile and parked blade 30% span station at a similar AOA

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Figure 3

Flow separation and impingement on the 2D profile (a), parked blade 80% span station (b), and parked blade 30% span station (c)

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Figure 4

Pressure contours and flow separation and impingement points on the upper surface of the parked blade at a pitch angle of 60deg

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Figure 5

Cn versus LFA for the 30% span station of the rotating and parked blades

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Figure 6

Cn versus LFA for the 80% span station of the rotating and parked blades

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Figure 7

Cp versus chord location for the 30% span station of the rotating and parked blades at a similar LFA

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Figure 8

Flow separation and impingement on the parked (a) and rotating (b) blades’ 30% span station

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Figure 9

Flow separation and impingement on the parked (a) and rotating (b) blades’ 80% span station

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Figure 10

Pressure contours and flow separation and impingement points on the upper surface of the rotating blade at WTS of 13m∕s

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