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• W2324584491 abstract "The theory of superposition of basic and additional lift distributions, which is wellknown for wings, is applied to horizontal-axis wind turbine (HAWT) rotor blades. The approach allows for efficient and rapid calculation of approximate loadings on the blade for any arbitrary twist distribution. Because the loading on the blade is described using a simple, linear superposition of pre-computed lift distributions, the effect of changes in pitch, blade twist, etc. can all be determined very quickly without the use of the analysis method. Thus, the approach can be used in closed-form solutions of problems in design optimization, aeroelasticity, and optimization of smart blades (with flaps or other effectors). Because superposition is expressed as a matrix equation, the approach allows easy coupling between aerodynamics and structures for static aeroelasticity problems. The approach needs to be extended to handle multiple tip speed ratios, section drag, and rotor power in future work. I. Introduction In this paper, the theory of superposition of basic and additional lift distributions, which is well-known for wings, is applied to horizontal-axis wind turbine (HAWT) rotor blades. With this approach, the loading on the blade is described using a simple, linear superposition of pre-computed lift distributions. As a result, the effects of changes in pitch, blade twist, etc. can all be determined very quickly using the stored information, without the need to use the analysis method. Thus, the approach can be used in closed-form solutions of problems in design optimization, aeroelasticity, and optimization of smart blades (with flaps or other effectors). Because superposition is expressed as a matrix equation, the approach allows easy coupling between aerodynamics and structures for static aeroelasticity problems. Recent work at NC State has shown how the superposition theory, applied to aircraft wings, can be used to advantage in optimization of adaptive wings 1–3 and static aeroelasticity. 4 In this paper, background material is first presented for the well-known application of superposition to aircraft wings. The subsequent section discusses how the theory can be extended to rotor blades. Finally, results are presented to demonstrate that the theory is successful in predicting the loading on a HAWT blade with an arbitrary twist distribution and to illustrate its use in inverse design." @default.
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• W2324584491 date "2011-01-04" @default.
• W2324584491 modified "2023-09-23" @default.
• W2324584491 title "A Superposition Theory for Efficient Computation of Approximate Lift Distributions on HAWT Rotor Blades" @default.
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• W2324584491 doi "https://doi.org/10.2514/6.2011-148" @default.
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