Aeroelastic Stability Analysis of a Quad-Rotor Wind Turbine

Ferede, Etana; Stillman, Alexander; Gandhi, Farhan

doi:10.1088/1742-6596/2265/4/042056

Cited by 2 publications

(1 citation statement)

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“…An obvious drawback of any such design is the increased complexity and concomitant increase in number of potential failure modes. Particularly, there are additional structural-dynamic concerns stemming from the boom arms [10,11]. Further, some MR studies suggest faster wake recovery is possible for designs with large spacings between the rotor tips (≥0.25𝐷 where 𝐷 is the diameter of one rotor) [4] that are not likely achievable for combined-tower configurations in practice given the large moments created by the cantilevered booms.…”

Section: Introductionmentioning

confidence: 99%

Wake interactions behind individual-tower multi-rotor wind turbine configurations

Brown

Cheung

Hsieh

et al. 2023

J. Phys.: Conf. Ser.

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Multiple rotors on single structures have long been proposed to increase wind turbine energy capture with no increase in rotor size, but at the cost of additional mechanical complexity in the yaw and tower designs. Standard turbines on their own very-closely-spaced towers avoid these disadvantages but create a significant disadvantage; for some wind directions the wake turbulence of a rotor enters the swept area of a very close downwind rotor causing low output, fatigue stress, and changes in wake recovery. Knowing how the performance of pairs of closely spaced rotors varies with wind direction is essential to design a layout that maximizes the useful directions and minimizes the losses and stress at other directions. In the current work, the high-fidelity large-eddy simulation (LES) code Exa-Wind/Nalu-Wind is used to simulate the wake interactions from paired-rotor configurations in a neutrally stratified atmospheric boundary layer to investigate performance and feasibility. Each rotor pair consists of two Vestas V27 turbines with hub-to-hub separation distances of 1.5 rotor diameters. The on-design wind direction results are consistent with previous literature. For an off-design wind direction of 26.6°, results indicate little change in power and far-wake recovery relative to the on-design case. At a direction of 45.0°, significant rotor-wake interactions produce an increase in power but also in far-wake velocity deficit and turbulence intensity. A severely off-design case is also considered.

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Section: Introductionmentioning

confidence: 99%