潮流能水平轴水轮机支撑立柱干扰研究

Supporting column influence analysis of horizontal axis tidal current turbine

基于全三维CFD数值模拟方法,通过改变支撑立柱的截面形状以及立柱前缘到叶轮旋转平面的距离,研究支撑立柱对水轮机水动力载荷与性能的干扰机理和影响规律.研究表明:立柱的干扰使水轮机平均能量利用率有所下降,最大能使水轮机平均能量利用率下降2%;对水轮机的瞬时性能有明显的影响,瞬时载荷产生显著波动.水轮机的能量利用率及载荷计算结果均与实验结果符合较好.

Based on three dimensions CFD （computational fluid dynamic） simulation, the law of the supporting column influence on the turbine performance was studied, by changing the section shape of supporting column and the distance between the supporting column and the rotation plane. The re- sults show that the supporting column will result in the decrease of the average power efficient, and the maximum value of which can be 2%. And the supporting column has obvious influence on the transience performance of turbine, which lead to the fluctuation of the transience loads of turbine. From the comparison with experiment results, it can be seen that the calculation results of turbine is reasonable and the curves of power coefficient and loads of turbine are following the experiment curves, therefor, the calculations results are credible.