通过数值仿真与模型试验的方式分析池壁效应对水平轴潮流涡轮水动力性能的影响。通过总结公开发表文献中池壁效应修正方法,获取不同流域以及来流流速下5种池壁效应的修正结果,并与无限流域下水平轴潮流涡轮的能量转换效率以及阻力系数进行对比,进而获得可准确预估无限流域下水平轴潮流涡轮水动力性能的池壁效应修正方法。结果表明：池壁效应会对潮流涡轮的水动力性能产生较为明显的影响,受限流域下潮流涡轮能量转换效率以及阻力系数高于无限流域下的结果,且池壁效应对潮流涡轮的能量转换效率的影响伴随尖速比的增加呈逐渐增大的趋势。受阻塞因子与尖速比的影响,不同池壁效应修正方法的预估精度不同;其中,Pope-Harper以及Bahaj这2种池壁效应修正结果在不同来流流速、阻塞因子以及尖速比下与无限流域下潮流涡轮的水动力性能吻合良好。
Abstract
In this paper, different blockage correction methods for the hydrodynamic performance of horizontal axis tidal stream turbine are analyzed based on numerical simulations and model tests. Five correction methods from published literature are obtained, and the correction results are compared with those in free-stream condition. Finally, blockage correction methods, which can accurately predict the hydrodynamic performance of tidal stream turbine in free-stream condition, are obtained. The results show that the wall effect has obvious influence on the hydrodynamic performance of the turbine. Power coefficients and drag coefficients in limited conditions are higher than those in free-stream condition, and the wall effect on power coefficients is gradually increasing with the increase of tip speed ratio. Due to the influence of blockage factor and tip speed ratio, the prediction accuracy of blockage correction methods is different; Pope and Harper correction results and Bahaj correction results are in good agreement with the performance of tidal stream turbine in free-stream condition. The research results provide a reference for numerical simulation of turbine's hydrodynamic performance and engineering technology transformation.
关键词
数值仿真 /
水动力 /
潮流 /
池壁效应 /
能量转换系数
Key words
numerical simulation /
hydrodynamics /
tidal stream /
wall effect /
power coefficient
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基金
国家自然科学基金（51309070）; 国家自然科学基金联合基金（U1706227）
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