Simulations of a vertical axis turbine in a channel

RENEWABLE ENERGY

卷:63

Article

Goude, Anders¹  Agren, Olov¹ 

[1] Uppsala Univ, Div Elect, Angstrom Lab, S-75121 Uppsala, Sweden

关键词: Vertical axis turbine;    Vortex method;    Channel flow;    Simulation;    Current power;   

DOI  :  10.1016/j.renene.2013.09.038

来源: Elsevier

【 摘 要 】

The power coefficient of a turbine increases according to the predictions from streamtube theory for sites with a confined fluid flow. Here, a vertical axis turbine (optimized for free flow) has been simulated by a two-dimensional vortex method, both in a channel and in free flow. The first part of the study concerns the numerical parameters of channel simulations. It is found that for free flow and wide channels, a large number of revolutions is required for convergence (around 100 at the optimal tip speed ratio and increasing with higher tip speed ratio), while for smaller channels, the required number of revolutions decreases. The second part analyses changes in turbine performance by the channel boundaries. The turbine performance increases when the channel width is decreased, although the results are below the predictions from streamtube theory, and this difference increases with decreasing channel width. It is also observed that the optimal tip speed ratio increases with decreasing channel width. By increasing the chord, which decreases the optimal tip speed ratio, the power coefficient can be increased somewhat. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free