We present a model for assessing the aerodynamic performance of a wind turbine rotor through a different parametrization of the classical Blade Element Momentum model. The model establishes an analytical relationship between the loading in the flow direction and the power along the rotor span. The main benefit of the model is the ease at which it can be applied for rotor optimization, and especially load constraint power optimization.
We present a model for assessing the aerodynamic performance of a wind turbine rotor through a...
Review status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.
A Method for Preliminary Rotor Design – Part 1: Radially Independent Actuator Disk model
Kenneth Loenbaek1,2,Christian Bak2,Jens I. Madsen1,and Michael McWilliam2Kenneth Loenbaek et al.Kenneth Loenbaek1,2,Christian Bak2,Jens I. Madsen1,and Michael McWilliam2
Received: 18 Aug 2020 – Accepted for review: 01 Oct 2020 – Discussion started: 06 Oct 2020
Abstract. We present an analytical model for assessing the aerodynamic performance of a wind turbine rotor though a different parametrization of the the classical Blade Element Momentum (BEM) model. The model is named the Radially Independent Actuator Disc model (RIAD) and it establishes an analytical relationship between the local-thrust loading and the local-power, known as the Local-Thrust-Coefficient and the Local-Power-Coefficient respectively. The model has a direct physical interpretation, showing the contribution for each of the 3 losses: wake-rotation-loss, tip-loss and viscous-loss. The gradients for RIAD is found through the use of the Complex-step-method and power optimization is used to show how easily the method can be used for rotor optimization. The main benefit of RIAD is the ease at which it can be applied for rotor optimization, and especially load constraint power optimization as it is described in Loenbaek et al. (2020). The relationship between the RIAD input and the rotor chord and twist is established and it is validate against a BEM solver.
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We present a model for assessing the aerodynamic performance of a wind turbine rotor through a different parametrization of the classical Blade Element Momentum model. The model establishes an analytical relationship between the loading in the flow direction and the power along the rotor span. The main benefit of the model is the ease at which it can be applied for rotor optimization, and especially load constraint power optimization.
We present a model for assessing the aerodynamic performance of a wind turbine rotor through a...