Performance of an H-Darrieus in the Skewed Flow on a Roof

[+] Author and Article Information
Sander Mertens, Gijs van Kuik, Gerard van Bussel

Delft University Wind Energy Research Institute, Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628 CN Delft

J. Sol. Energy Eng 125(4), 433-440 (Nov 26, 2003) (8 pages) doi:10.1115/1.1629309 History: Received December 19, 2002; Revised July 17, 2003; Online November 26, 2003
Copyright © 2003 by ASME
Topics: Flow (Dynamics)
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Visualization of the turbulent separation over a rectangular building in boundary layer flow
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Dimensions of the domain of the CFD calculation
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CFD calculations of the separation streamlines at a model building with dimensions height×width×depth=20×30×10 m for different roughness z0 of the upwind area
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CFD calculations of the skew angle [deg] at a model building with dimensions height×width×depth=20×30×10 m for different roughness z0 of the upwind area
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CFD calculation of the velocity profile above the center of the roof compared to the undisturbed velocity profile
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Schematic side view of an H-Darrieus in skewed flow. Between the dotted lines: operating as a double rotor part (d). Above and below the dotted lines: operating as a single rotor part (s).
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Schematic drawing of the skewed flow on an actuator disk
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Top view of the H-Darrieus in skewed flow
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Side view of the H-Darrieus with illustration of the different flow angles
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Photo of the test of the H-Darrieus in the open-jet wind tunnel. The size of the Darrieus is overestimated because of the camera point of view
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Measured and calculated Tip Speed Ratio at maximum aerodynamic efficiency in skewed flow with skew angle γ
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Measured and calculated performance coefficients in skewed flow with skew angle γ
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Calculated induction factor (vertical) at zero skew angle, plotted on the projected diameter of the H-Darrieus (horizontal). Right part of the graph: blade moves against the wind
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Maximum aerodynamic efficiency of a HAWT in yawed flow according to Glauert momentum theory for yawed flow 15




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