School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK.
Philos Trans A Math Phys Eng Sci. 2013 Jan 14;371(1985):20120159. doi: 10.1098/rsta.2012.0159. Print 2013 Feb 28.
It is well known that a wake will develop downstream of a tidal stream turbine owing to extraction of axial momentum across the rotor plane. To select a suitable layout for an array of horizontal axis tidal stream turbines, it is important to understand the extent and structure of the wakes of each turbine. Studies of wind turbines and isolated tidal stream turbines have shown that the velocity reduction in the wake of a single device is a function of the rotor operating state (specifically thrust), and that the rate of recovery of wake velocity is dependent on mixing between the wake and the surrounding flow. For an unbounded flow, the velocity of the surrounding flow is similar to that of the incident flow. However, the velocity of the surrounding flow will be increased by the presence of bounding surfaces formed by the bed and free surface, and by the wake of adjacent devices. This paper presents the results of an experimental study investigating the influence of such bounding surfaces on the structure of the wake of tidal stream turbines.
众所周知，由于轴向动量在转子平面上的提取，潮汐流涡轮机会在其下游产生尾流。为了选择水平轴潮汐流涡轮机阵列的合适布局，了解每个涡轮机的尾流的范围和结构非常重要。对风力涡轮机和孤立的潮汐流涡轮机的研究表明，单个装置尾流中的速度降低是转子运行状态（特别是推力）的函数，并且尾流速度的恢复速度取决于尾流和周围流之间的混合。对于无界流，周围流的速度类似于入射流的速度。然而，由于床面和自由表面形成的边界表面以及相邻设备的尾流的存在，周围流的速度将会增加。本文介绍了一项实验研究的结果，该研究调查了这种边界表面对潮汐流涡轮机尾流结构的影响。
