Research Papers: Alternative Energy Sources

Advances in Horizontal Axis Wind Turbine Blade Designs: Introduction of Slots and Tubercle

[+] Author and Article Information
Mohamed Ibrahim

University of Wisconsin Milwaukee,
115 E Reindl Way,
Glendale, WI 53212
e-mail: Ibrahim3@uwm.edu

Abdulrahman Alsultan

University of Wisconsin Milwaukee,
115 E Reindl Way,
Glendale, WI 53212
e-mail: alsultan@uwm.edu

Shaohua Shen

University of Wisconsin Milwaukee,
115 E Reindl Way,
Glendale, WI 53212
e-mail: shaohua@uwm.edu

Ryoichi S. Amano

Fellow ASME
University of Wisconsin Milwaukee,
115 E Reindl Way,
Glendale, WI 53212
e-mail: amano@uwm.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 13, 2014; final manuscript received February 25, 2015; published online May 8, 2015. Assoc. Editor: Bengt Sunden.

J. Energy Resour. Technol 137(5), 051205 (Sep 01, 2015) (6 pages) Paper No: JERT-14-1408; doi: 10.1115/1.4030399 History: Received December 13, 2014; Revised February 25, 2015; Online May 08, 2015

Despite being harvested thousands of years ago, wind energy was neglected during the industrial revolution because of the strong dependence on fossil fuels. However, after the alarming decrease in the fossil fuels reserves, many have drawn their attentions back to a renewable energy technology, especially the wind energy. This paper presents some of the new designs that are being tested, including slotted blades and tubercles design models. The experimental results are used to validate the numerical studies that are being conducted parallel to the experiments for better understanding and more detailed results. The new slotted blade design produced more power compared to the straight blade for lower wind speeds, while the tubercle blades showed better power performance in severe wind conditions and a more steady behavior under unsteady and higher wind velocities.

Copyright © 2015 by ASME
Topics: Blades
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Fig. 1

Wind tunnel facility

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Fig. 2

Mean air flow velocity at two different planes measured inside the wind tunnel

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Fig. 4

Maximum possible power coefficient for different turbine blades

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Fig. 5

Power generated by three different blades designs with different wind speeds: solid lines for slotted blade, mixed line for straight blade, and dotted line for tubercle blade.

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Fig. 6

Velocity vectors for a slotted blade section showing air jet injected at the pressure side from the slot

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Fig. 7

Pressure distribution for a straight and a slotted blade sections showing an increase in the pressure at the lower surface for the slotted blade compared to the straight blade

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Fig. 8

Stall criteria for straight and tubercle blade designs and two different rpm: (a) 680 rpm and (b) 1100 rpm; mixed line for straight blade and dotted line for tubercle blade

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Fig. 9

The TSR for the straight blade (a) and the tubercle blade (b) at different wind speeds plotted with different electric resistances (2, 1, 0.5, 0.3, and 0.2 Ω) connected to the electric circuit




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