垂直轴潮流能涡轮机水动特性研究

潮流能水轮机日益受到重视,针对其叶轮翼型水动力问题,提出了一种襟翼控制策略,计算不同襟翼翼型的垂直轴潮流能涡轮机水动力学动态特性,对比分析了襟翼控制前、后的垂直轴潮流能涡轮机力矩系数周期性变化规律。结果表明:所提控制策略可在不影响力矩系数均值的情况下,有效降低力矩系数振幅,且非对称襟翼翼型力矩系数振幅小于对称襟翼翼型;通过分析流场结构发现,施加控制策略的翼型尾缘流场较未施加控制策略的尾缘流场细长;襟翼控制叶片转过之后的尾涡贴合于旋转轨迹,对下游流场影响较小,易于耗散;发生大涡分离的方位角范围为160°~260°,叶片内侧涡强增大,而施加控制策略之后,该现象得到很好改善。

Research on hydrodynamic characteristics of vertical axis tidal current turbine

The tidal current turbine was paid more and more attentions, a flap control strategy is proposed for the hydrodynamic problem of its impeller airfoil, the hydrodynamic dynamic characteristics of the turbine with different flap airfoil are calculated, the variation law of the torque coefficient of the vertical axis tidal current before and after the flap control was analyzed. The results showed that the proposed control strategy can effectively reduce the amplitude of the torque coefficient without affecting the mean value of the moment coefficient, while the amplitude coefficient of the asymmetric flap wing was smaller than that of the symmetrical flap; by analyzing the flow field structure, it was found that the flow field of the trapezoidal trailing edge of the control strategy was more slender than the flow field without the control strategy; the flap controled the vane after the blade is turned into the rotation trajectory, which had little effect on the downstream flow field and is easy to dissipate; the azimuth angle of the large vortex was 160°~260°, and the vortex intensity increased, the phenomenon was improved after the control strategy was applied.