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Keywords: wind tunnels
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Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2009, 131(3): 031009.
Published Online: July 9, 2009
..., “Unsteady Aerodynamics Experiment Phase, VI: Wind Tunnel Test Configurations and Available Data Campaigns,” NREL, Technical Report No. TP-500-29955 ) wind-tunnel campaign at 7 m/s, 10 m/s, and 20 m/s freestreams for a nonyawed isolated rotor. Comparisons are shown for the surface pressure distributions...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2008, 130(3): 031015.
Published Online: July 16, 2008
...R. P. J. O. M. van Rooij The investigation focuses on the analysis of the airfoil segment performances along rotor blades in the parked configuration. In this research, wind tunnel experiments on two twisted blade geometries with different airfoils played a dominant role. These measurements were...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2008, 130(3): 031018.
Published Online: July 16, 2008
...Takao Maeda; Yasunari Kamada; Jun Suzuki; Hideyasu Fujioka This study shows the results of pressure distribution measurements on a rotor blade of a horizontal axis wind turbine under various yawed operations. The experiments are carried out in a wind tunnel with a 2.4 m diameter test rotor...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. August 2008, 130(3): 031009.
Published Online: July 1, 2008
...Wouter Haans; Gijs van Kuik; Gerard van Bussel To reduce the level of uncertainty associated with current rotor aerodynamics codes, improved understanding of rotor aerodynamics is required. Wind tunnel measurements on model rotors contribute to advancing our knowledge on rotor aerodynamics...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 487–497.
Published Online: August 1, 2006
... visualization of the tip vortices is also presented. Thrust measurements of the rotor were performed to understand the effect of skew on thrust variation and to compare with analytical predictions. 06 02 2006 01 08 2006 wind tunnels flow visualisation wakes rotors blades...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 422–431.
Published Online: July 19, 2006
...J. P. Baker; E. A. Mayda; C. P. van Dam An experimental investigation of blunt trailing-edge or flatback airfoils was conducted in the University of California, Davis aeronautical wind tunnel. The blunt trailing-edge airfoil is created by symmetrically adding thickness to both sides of the camber...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 445–454.
Published Online: July 16, 2006
... flow structure in an earlier detached eddy simulation by another group, however, it was not directly observed experimentally but only inferred. Computed results show very good agreement with measured wind tunnel data for the PCS model. Finally, a new method for extracting three-dimensional airfoil data...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 472–480.
Published Online: July 16, 2006
... stall on the blade for a rotor in yawed flow conditions. A rotor model is placed in an open jet wind tunnel and tested in yawed flow conditions. The locations of dynamic stall on the blade of a rotor model as a function of the blade position are observed. Two experimental techniques are used; tufts...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2006, 128(4): 455–460.
Published Online: June 19, 2006
... and V = 8 , 10, and 12 m ∕ s and zero yaw. Comparisons of the root flap bending moments predicted by the model with the National Renewable Energy Laboratory (NREL) experimental data indicate that the NREL blades designed for the wind tunnel campaigns are quite rigid and that the tower interference...
Journal Articles
Article Type: Research Papers
J. Sol. Energy Eng. November 2005, 127(4): 496–502.
Published Online: July 12, 2005
...R. P. J. O. M. van Rooij; J. G. Schepers The effect of rotation has been investigated with emphasis on the impact of blade geometry on the “correction factor” in stall models. The data used came from field tests and wind tunnel experiments performed by the National Renewable Energy Laboratory...
Journal Articles
Article Type: Article
J. Sol. Energy Eng. May 2005, 127(2): 185–191.
Published Online: April 25, 2005
... data were acquired by testing in a wind tunnel. Analyses compared aerodynamic forces and surface pressure distributions under field conditions against analogous baseline data acquired from the wind tunnel data. The results show that aerodynamic performance of the section 70%, for local angle of attack...
Journal Articles
Article Type: Article
J. Sol. Energy Eng. May 2005, 127(2): 192–199.
Published Online: April 25, 2005
... VI NASA Ames 24 m × 36 m 80 ft × 120 ft wind tunnel test of a two-bladed, tapered, twisted rotor relate to the prediction of peak and post-peak rotor power. The performance prediction code, NREL’s Lifting Surface Prescribed Wake code (LSWT), was used to study the flow physics along the blade. Airfoil...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2004, 126(4): 1002–1010.
Published Online: November 18, 2004
...% to cover the entire span of a wind turbine blade. The airfoils were designed to have high maximum lift and high design lift to allow a slender flexible blade while maintaining high aerodynamic efficiency. The design was carried out with a Risø in-house multi disciplinary optimization tool. Wind tunnel...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2004, 126(4): 1025–1033.
Published Online: November 18, 2004
... Renewable Energy Laboratory (NREL) Unsteady Aerodynamics Experiment (UAE), a full-scale HAWT tested in the NASA Ames 80 ft×120 ft wind tunnel. These surface pressure data were processed to obtain normal force and flow field topology data. Further analyses were carried out in a manner that allowed tip speed...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2004, 126(4): 1034–1040.
Published Online: November 18, 2004
...Xabier Munduate; Frank N. Coton; Roderick A.McD. Galbraith This paper presents results from a wind tunnel based examination of the response of a wind turbine blade to tower shadow in head-on flow. In the experiment, one of the blades of a small-scale, two-bladed, downwind turbine was instrumented...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2004, 126(4): 974–985.
Published Online: November 18, 2004
...Paul Migliore; Stefan Oerlemans Aeroacoustic tests of seven airfoils were performed in an open jet anechoic wind tunnel. Six of the airfoils are candidates for use on small wind turbines operating at low Reynolds numbers. One airfoil was tested for comparison to benchmark data. Tests were conducted...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2004, 126(4): 986–1001.
Published Online: November 18, 2004
...Michael S. Selig; Bryan D. McGranahan This paper presents detailed wind tunnel tests data taken on six airfoils having application to small wind turbines. In particular, lift, drag and moment measurements were taken at Reynolds numbers of 100,000, 200,000, 350,000 and 500,000 for both clean...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2003, 125(4): 441–447.
Published Online: November 26, 2003
... number are investigated. Experiments were carried out in a wind tunnel with an open, 3.6 m diameter, test section. Rotor models included two- and three-blade upwind turbines with four sets of blades with different aspect ratios. With the rotor blades tested, a maximum power augmentation of about 14.5...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2003, 125(4): 448–456.
Published Online: November 26, 2003
... Renewable Energy Laboratory (NREL). Unsteady Aerodynamics Experiment (UAE), a full-scale HAWT tested in the NASA Ames 80-by-120-foot wind tunnel. Time records of surface pressures and normal force were processed to obtain means and standard deviations. Surface pressure means and standard deviations were...
Journal Articles
Article Type: Technical Papers
J. Sol. Energy Eng. November 2003, 125(4): 488–496.
Published Online: November 26, 2003
...W. A. Timmer; R. P. J. O. M. van Rooij This paper gives an overview of the design and wind tunnel test results of the wind turbine dedicated airfoils developed by Delft University of Technology (DUT). The DU-airfoils range in maximum relative thickness from 15% to 40% chord. The first designs were...