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https://doi.org/10.5194/wes-2018-61
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Brief communications 28 Sep 2018

Brief communications | 28 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).

Wind inflow observation from load harmonics: wind tunnel validation of the rotationally symmetric formulation

Marta Bertelè1, Carlo L. Bottasso1, and Stefano Cacciola2 Marta Bertelè et al.
  • 1Wind Energy Institute, Technische Universität München, Garching bei München, 85748, Germany
  • 2Dipartimento di Scienze e Tecnologie Aerospaziali, Politecnico di Milano, Milano, 20156, Italy

Abstract. The present paper further develops and experimentally validates the previously published idea of estimating the wind inflow at a turbine rotor disk from the machine response. A linear model is formulated that relates one per revolution (1P) harmonics of the in- and out-of-plane blade root bending moments to four wind parameters, representing vertical and horizontal shears and misalignment angles. Improving on this concept, the present work exploits the rotationally symmetric behaviour of the rotor in the formulation of the load-wind model. In a nutshell, this means that the effects on the loads of the vertical shear and misalignment are the same as those of the horizontal quantities, simply shifted by π/2. This results in a simpler identification of the model, which needs a reduced set of observations. The performance of the proposed method is first tested in a simulation environment and then validated with an experimental data set obtained with an aeroelastically scaled turbine model in a boundary layer wind tunnel.

Marta Bertelè et al.
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Marta Bertelè et al.
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Short summary
This paper describes a new formulation for estimating the wind inflow at the rotor disk, based on measurements of the blade loads. The new method improves on previous formulations, by exploiting the rotational symmetry of the problem. Experimental results obtained with an aeroelastically scaled model in a boundary layer wind tunnel are used for validating the proposed approach.
This paper describes a new formulation for estimating the wind inflow at the rotor disk, based...
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