Abstract
The actuator cylinder (AC) flow model is defined as the ideal VAWT rotor. Radial directed volume forces are applied on the circular path of the VAWT rotor airfoil and constitute an energy conversion in the flow. The power coefficient for the ideal as well as the real energy conversion is defined. The describing equations for the two-dimensional AC model are presented and a solution method splitting the final solution in a linear and non-linear part is briefly described. A family of loadforms approaching the uniform loading is used to study the ideal energy conversion indicating that the maximum power coefficient for the ideal energy conversion of a VAWT could exceed the Betz limit. The real energy conversion of the 5MW DeepWind rotor is simulated with the AC flow model in combination with the blade element analysis. Aerodynamic design aspects are discussed on this basis revealing that the maximum obtainable power coefficient for a fixed pitch VAWT is constrained by the fundamental cyclic variation of inflow angle and relative velocity leading to a loading that deviates considerably from the uniform loading.
Highlights
The Actuator Cylinder flow model Results Conclusions OutlookDTU Wind Energy, Technical University of DenmarkTORQUE 2012, Oldenburg, GermanyOctober 9-11, 2012 HAa MadsenRenewed interest in Vertical Axis Wind TurbinesDesigns of the 1980 ́sCredits Image by Grimshaw & Wind Power Ltd Recent designsConsidered turbineDeepWind 5MW designAccurate aerodynamic and aeroelastic design tools are necessary for the design studies of the new VAWT concepts
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2) a solution procedure with potentials for low computational demands: Approach: solution is split into a linear and a non-linear part
Summary
Citation (APA): Aagaard Madsen , H. (Author), Schmidt Paulsen, U. (Author), & Vita, L. (Author). (2012). General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.
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