Experimental analysis of the shear flow effect on tidal turbine blade root force from three-dimensional mean flow reconstruction
Experimental analysis of the shear flow effect on tidal turbine blade root force from three-dimensional mean flow reconstruction
复制标题
三维平均流重构剪切流对潮汐机叶根力影响的实验分析
DOI：
10.1098/rsta.2020.0001
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
G. Germain
中科院分区：
文献类型：
--
作者：
B. Gaurier;P. Druault;M. Ikhennicheu;G. Germain
在Alderney Race等主要潮汐能源地，湍流强度大，流速波动可能对船用涡轮机产生重大影响。为了更好地理解这种现象，一个三叶片涡轮模型被放置在一个通用的壁挂式障碍物之后，代表了现场水深变化。从二维粒子图像测速平面，在三维空间中重建障碍物尾迹的时间平均速度。该重建方法基于适当的正交分解，并且能够获得平均流场和相关剪切的表示。然后，对障碍物后的四个涡轮位置，观察了速度梯度对涡轮叶片根力的影响。随着离障碍物距离的增加，叶片根力平均值减小，而其标准差增大。这一相平均力的角分布是非均匀的，在一个涡轮旋转周期内变化约为其时间平均值的20%。这种由速度剪切引起的力变化将在叶片疲劳方面产生重大后果。本文是《奥尔德尼竞赛中关于潮汐动力学和潮汐能量采集的新见解》主题的一部分。
In the main tidal energy sites like Alderney Race, turbulence intensity is high and velocity fluctuations may have a significant impact on marine turbines. To understand such phenomena better, a three-bladed turbine model is positioned in the wake of a generic wall-mounted obstacle, representative of in situ bathymetric variation. From two-dimensional Particle Image Velocimetry planes, the time-averaged velocity in the wake of the obstacle is reconstructed in the three-dimensional space. The reconstruction method is based on Proper Orthogonal Decomposition and enables access to a representation of the mean flow field and the associated shear. Then, the effect of the velocity gradient is observed on the turbine blade root force, for four turbine locations in the wake of the obstacle. The blade root force average decreases whereas its standard deviation increases when the distance to the obstacle increases. The angular distribution of this phase-averaged force is shown to be non-homogeneous, with variation of about 20% of its time-average during a turbine rotation cycle. Such force variations due to velocity shear will have significant consequences in terms of blade fatigue. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.
三叶片水平轴潮汐涡轮机载荷随频率和叶片位置的变化
影响因子：
3.6
作者：
Payne G
通讯作者：
Payne G