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Keywords: torque
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Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. November 2011, 133(4): 044503.
Published Online: October 18, 2011
...Binyet Emmanuel; Wang Jun The aim of the present paper is to investigate ways of improving the efficiency of a six-bladed Savonius rotor. The efficiency of Savonius machines is low because of the “negative drag” exerted on the convex part of the blades and also because the torque of standard...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2010, 132(3): 031008.
Published Online: June 14, 2010
... approaches. For the low wind speeds, e.g., between 3.5 m/s and 7 m/s, the torque value and the torque rate of change were found to be meaningful parameters impacting the wind turbine vibration. For higher wind speeds, e.g., between 7 m/s and 12 m/s, the torque value and the blade pitch angle could...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2009, 131(3): 031009.
Published Online: July 9, 2009
... at several stations along the blades as well as for the integrated thrust and torque values. In addition, a comparison between measurements and CFD results is shown for the local flow angle at several stations ahead of the wind turbine blades. For attached and moderately stalled flow conditions the thrust...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. February 2008, 130(1): 011010.
Published Online: December 28, 2007
...L. Amsbeck; R. Buck; A. Pfahl; R. Uhlig In standard heliostat design, the usual strategy of cost reduction is to increase the mirror area of the heliostats. This not only leads to a reduction of specific drive cost but also to an increase of the torques caused by the wind loads, resulting in higher...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 516–530.
Published Online: August 14, 2006
...B. Boukhezzar; H. Siguerdidjane; M. Maureen Hand To maximize wind power extraction, a variable-speed wind turbine (VSWT) should operate as close as possible to its optimal power coefficient. The generator torque is used as a control input to improve wind energy capture by forcing the wind turbine...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 506–515.
Published Online: July 25, 2006
...), a turbine specifically configured to test advanced controls. We show the design of control systems to regulate turbine speed in region 3 using rotor collective pitch and reduce dynamic loads in regions 2 and 3 using generator torque. These controls enhance damping in the first drive train torsion mode. We...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2003, 125(4): 402–409.
Published Online: November 26, 2003
... flatwise moments markedly reduces flatwise fatigue damage due to this source, and, to a lesser degree, the in-plane damage due to turbulence. The same is true of fluctuating rotor torque moments driven by turbulence and transmitted to the drive train. Blade root moments out of the plane of rotation...
Journal Articles
Article Type: Technical Briefs
J. Sol. Energy Eng. November 2000, 122(4): 203–206.
Published Online: August 1, 2000
... and the wind regime to model the wind pump discharge. The wind velocity-power relationship of the rotor is assumed to be quadratic. The wind regime is characterized by the Raleigh distribution. Differences in the starting and running torque requirements of the pump are also considered in the model. Wind data...