Aerodynamic Testing of a Rotating Wind Turbine Blade PDF Download

Author: C. P. Butterfield
Publisher:
ISBN:
Category : Pressure
Languages : en
Pages : 0

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Book Description

Author: C. P. Butterfield
Publisher:
ISBN:
Category : Pressure
Languages : en
Pages : 0

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Book Description
Aerodynamic, load, flow-visualization, and inflow measurements were taken on a downwind horizontal-axis wind turbine (HAWT). A video camera mounted on the rotor recorded video images of tufts attached to the low-pressure side of the blade. Strain gages, mounted every 10% of the blade's span, provided load and pressure measurements. Pressure taps at 32 chordwise positions recorded pressuredistributions. Wind inflow was measured via a vertical-plane array of anemometers located 10 m upwind. The objectives of the test were to address whether airfoil pressure distributions measured on a rotating blade differed from those measured in the wind tunnel, if radial flow near or in the boundary layer of the airfoil affected pressure distributions, if dynamic stall could result in increaseddynamic loads, and if the location of the separation boundary measured on the rotating blade agreed with that measured in two-dimensional flow in the wind tunnel.

Author: Charles P. Butterfield
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 36

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Book Description

Author: Charles P. Butterfield
Publisher:
ISBN:
Category : Pressure
Languages : en
Pages : 10

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Book Description
Wind turbine generators commonly operate in either a fixed-pitch or variable-pitch mode. In variable-pitch mode the angle of the blade is changed as the wind speed varies to maintain near optimum airfoil angle of attack and to regulate peak power. The more common fixed-pitch rotors do not change pitch angle to regulate peak power. Instead the blade is allowed to stall aerodynamically. This approach results in rapid relief of loads caused by gusts and is more reliable and cost effective. However, the designer must accurately understand the rotating-blade stall; behavior of the airfoil in order to predict turbine loads. To understand such stall behavior a test program that uses specially designed instrumentation has been conducted by the Solar Energy Research Institute (SERI). A microprocessor-controlled measurement system has been designed and built to make accurate measurements of low pressures on a rotating wind turbine blade.

Author: Charles P. Butterfield
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 6

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Book Description
The Solar Energy Research Institute (SERI) has conducted a series of tests to measure the spanwise variation of airfoil performance characteristics on a rotating wind turbine blade. Maximum lift coefficients were measured to be 200% greater than wind tunnel results at the 30% span. Stall characteristics were generally modified throughout the span. Lift characteristics were unmodified for low to medium angles of attack. This paper discusses these test results for four spanwise locations.

Author: James F. Manwell
Publisher: John Wiley & Sons
ISBN: 9780470686287
Category : Technology & Engineering
Languages : en
Pages : 704

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Book Description
Wind energy’s bestselling textbook- fully revised. This must-have second edition includes up-to-date data, diagrams, illustrations and thorough new material on: the fundamentals of wind turbine aerodynamics; wind turbine testing and modelling; wind turbine design standards; offshore wind energy; special purpose applications, such as energy storage and fuel production. Fifty additional homework problems and a new appendix on data processing make this comprehensive edition perfect for engineering students. This book offers a complete examination of one of the most promising sources of renewable energy and is a great introduction to this cross-disciplinary field for practising engineers. “provides a wealth of information and is an excellent reference book for people interested in the subject of wind energy.” (IEEE Power & Energy Magazine, November/December 2003) “deserves a place in the library of every university and college where renewable energy is taught.” (The International Journal of Electrical Engineering Education, Vol.41, No.2 April 2004) “a very comprehensive and well-organized treatment of the current status of wind power.” (Choice, Vol. 40, No. 4, December 2002)

Author:
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 0

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Book Description
The Solar Energy Research Institute (SERI) has conducted a series of tests to measure the spanwise variation of airfoil performance characteristics on a rotating wind turbine blade. Maximum lift coefficients were measured to be 200% greater than wind tunnel results at the 30% span. Stall characteristics were generally modified throughout the span. Lift characteristics were unmodified for low to medium angles of attack. This paper discusses these test results for four spanwise locations.

Author:
Publisher:
ISBN:
Category : Pressure
Languages : en
Pages : 0

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Book Description
Wind turbine generators commonly operate in either a fixed-pitch or variable-pitch mode. In variable-pitch mode the angle of the blade is changed as the wind speed varies to maintain near optimum airfoil angle of attack and to regulate peak power. The more common fixed-pitch rotors do not change pitch angle to regulate peak power. Instead the blade is allowed to stall aerodynamically. This approach results in rapid relief of loads caused by gusts and is more reliable and cost effective. However, the designer must accurately understand the rotating-blade stall; behavior of the airfoil in order to predict turbine loads. To understand such stall behavior a test program that uses specially designed instrumentation has been conducted by the Solar Energy Research Institute (SERI). A microprocessor-controlled measurement system has been designed and built to make accurate measurements of low pressures on a rotating wind turbine blade.

Author: Jin Chen
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110383748
Category : Science
Languages : en
Pages : 405

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Book Description
Wind Turbine Airfoils and Blades introduces new ideas in the design of wind turbine airfoils and blades based on functional integral theory and the finite element method, accompanied by results from wind tunnel testing. The authors also discuss the optimization of wind turbine blades as well as results from aerodynamic analysis. This book is suitable for researchers and engineers in aeronautics and can be used as a textbook for graduate students.

Author: J. G.Holierhoek
Publisher: Elsevier Inc. Chapters
ISBN: 0128089164
Category : Technology & Engineering
Languages : en
Pages : 30

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Book Description
Aeroelasticity concerns the interaction between aerodynamics, dynamics and elasticity. This interaction can result in negatively or badly damped wind turbine blade modes, which can have a significant effect on the turbine lifetime. The first aeroelastic problem that occurred on commercial wind turbines concerned a negatively damped edgewise mode. It is important to ensure that there is some out-of-plane deformation in this mode shape to prevent the instability. For larger turbine blades with lower torsional stiffness and the possibility of higher tip speeds for the offshore designs, classical flutter could also become relevant. When designing a wind turbine blade, it is therefore crucial that there is enough damping for the different modes and that there is no coincidence of natural frequencies with excitation frequencies (resonance). An effective aeroelastic analysis is also important, and the tools used for such an analysis must include the necessary detail in the structural model.