非对称翼垂直轴水轮机水动力性能研究

Hydrodynamic performance of asymmetric hydrofoil vertical axis tidal turbine

为了研究非对称翼垂直轴水轮机的水动力性能,利用Fluent软件建立水轮机的二维模型,分析采用不同拱度非对称翼的垂直轴水轮机在不同叶尖速比下的水动力性能、能量提取性能以及非对称翼的安装位置对水轮机性能的影响,并与对称翼垂直轴水轮机的性能进行对比。研究结果表明:与对称翼垂直轴水轮机相比,非对称翼垂直轴水轮机在较低和较高叶尖速比区间具有更高的能量提取效率,但在中等叶尖速比区间,即水轮机最佳工作区间,采用非对称翼会导致能量提取性能下降;增大水翼的拱度,能有效减小水翼受力波动幅度,有利于提高水轮机的疲劳寿命;非对称翼的安装位置为0.7c时,非对称翼垂直轴水轮机的能量提取性能最佳。

In order to examine the hydrodynamic performance of asymmetric hydrofoil vertical axis tidal turbine. In this paper, a two-dimensional model of tidal turbine was built by Fluent. The hydrodynamic performance, energy extraction performance and blade preset position of asymmetric hydrofoil vertical axis tidal turbine with different cambers in different TSR（Tip Speed Ratio） were analyzed, and compared with the symmetric hydrofoil tidal turbine. The result shows：Compared with the symmetric hydrofoil vertical axis tidal turbine, the asymmetric hydrofoil tidal turbine has higher energy extraction efficiency at low and high TSR range; However, in the middle TSR range, the optimal working range of the tidal turbine, the asymmetric hydrofoil will lead to a decrease in energy extraction performance; Increasing the camber can effectively reduce the fluctuation amplitude of hydrofoil force and improve the fatigue life of the turbine; When the blade preset position is 0.7 c, the energy efficiency of asymmetric hydrofoil vertical axis turbine is better.