Mitigation of rotor thrust fluctuations through passive pitch

被引:7
|
作者
Dai, Weidong [1 ]
Broglia, Riccardo [2 ]
Viola, Ignazio Maria [1 ]
机构
[1] Univ Edinburgh, Inst Energy Syst, Sch Engn, Edinburgh EH9 3FB, Scotland
[2] CNR, Inst Marine Engn, INM CNR, Via Vallerano 139, I-00128 Rome, Italy
基金
英国工程与自然科学研究理事会;
关键词
Turbine rotor; Unsteady loads; Tidal energy; Passive pitch; Morphing blade; Fluid-structure interaction; FREE-SURFACE; WIND; AERODYNAMICS; PREDICTION; FLOW;
D O I
10.1016/j.jfluidstructs.2022.103599
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A rotor blade operating in an unsteady or a sheared stream experiences force fluctuations, which increase the structural requirements for both the blades and the rotor system as a whole. In this paper, we investigate whether force fluctuations can be passively mitigated without compromising the mean load. We consider a tidal turbine rotor in a shear current at a diameter-based Reynolds number of 2 x 10(7). The blades are rigid and can passively pitch. A mass-spring system acts on the spanwise axis of the blade governing the pitch kinematics. The effectiveness of this system is demonstrated with three methodologies: an analytical model based on blade element momentum theory and Theodorsen's theory, and two sets of Reynolds-averaged Navier-Stokes simulations performed with two independent codes. The analytical and the numerical models are validated against experiments and simulations in the literature. All methodologies predict a reduction of more than 80% of the thrust fluctuations. Furthermore, because of the more uniform thrust force exerted on the current, the wake behind a passive pitch blade does not diffuse the onset shear flow. This results in a more sheared wake and faster wake recovery. The present results demonstrate the potential benefits of passive pitch and may underpin future applications of this concept for different types of turbines and compressors, including wind turbines, propellers, helicopter rotors, etc.(C) 2022 The Author(s). Published by Elsevier Ltd.
引用
收藏
页数:23
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