On the spectral behaviour of the turbulence-driven power fluctuations of horizontal-axis turbines

被引:24
|
作者
Deskos, Georgios [1 ]
Payne, Gregory S. [2 ]
Gaurier, Benoit [3 ]
Graham, Michael [4 ]
机构
[1] Natl Renewable Energy Lab, Natl Wind Technol Ctr, Golden, CO 80401 USA
[2] Ecole Cent Nantes, Lab Rec Hydrodynam Energet & Environm Atmosper, 1 Rue Noe, F-44300 Nantes, France
[3] IFREMER, Marine Struct Lab, 150 Quai Gambetta,BP 699, F-62321 Boulogne, France
[4] Imperial Coll London, Dept Aeronaut, London SW7 2AZ, England
基金
英国工程与自然科学研究理事会;
关键词
flow-structure interactions; WIND; IMPACT; BLADE;
D O I
10.1017/jfm.2020.681
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In this article we consider the spectral behaviour of turbulence-driven power fluctuations for a single horizontal-axis turbine. To this end, a small-scale instrumented axial-flow hydrokinetic turbine model (diameter = 0.724 m) is deployed in the long water flume situated in the laboratory facilities of IFREMER in Boulogne-sur-Mer, France, and synchronous measurements of the upstream velocity and the rotor are collected for different tip-speed ratios. The study confirms previous findings suggesting that the power spectra follow the velocity spectra behaviour in the large scales region and a steeper power law slope behaviour (-11/3) over the inertial frequency sub-range. However, we show that both the amplitude of the power spectra and low-pass filtering effect over the inertial sub-range also depend on the rotor aero/hydrodynamics (e.g. dC(L)/d alpha) and the approaching flow deceleration and not solely on the rotational effects. In addition, we present a novel semi-analytical model to predict the dominant blade-passing frequency harmonics in the high-frequency regime using the rotationally sampled spectra technique. For all calculations, the distortion of incoming turbulence is taken into account.
引用
收藏
页数:27
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