Analytic analysis of load alignment for coning extreme‐scale rotors

Noyes, Carlos; Qin, Chao; Loth, Eric

doi:10.1002/we.2435

Analytic analysis of load alignment for coning extreme‐scale rotors

Journal Article · Sun Nov 03 00:00:00 EDT 2019 · Wind Energy

DOI:https://doi.org/10.1002/we.2435· OSTI ID:1573064

^[1]; Qin, Chao ^[1]; Loth, Eric ^[1]

Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville Virginia

Abstract

Extreme‐scale wind turbines (rated powers greater than 10 MW) with large rotor diameters and conventional upwind designs must resist extreme downwind and gravity loads. This can lead to significant structural design challenges and high blade masses that can impede the reduction of levelized cost of wind energy. Herein, the theoretical basis for downwind load alignment is developed. This alignment can be addressed with active downwind coning to reduce/eliminate flapwise bending loads by balancing the transverse components of thrust, centrifugal, and gravitational force. Equations are developed herein that estimates the optimal coning angle that reduces flapwise loads by a specified amount. This analysis is then applied to a 13.2‐MW scale with 100‐m‐level wind turbine blades, where it is found that a load alignment coning schedule can substantially reduce the root flapwise bending moments. This moment reduction in this example can allow the rotor mass to be decreased significantly when compared with a conventional upwind three‐bladed rotor while maintaining structural performance and annual energy output.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AR0000667

OSTI ID:: 1573064

Journal Information:: Wind Energy, Journal Name: Wind Energy Journal Issue: 2 Vol. 23; ISSN 1095-4244

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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