Analysis on the Energy Capture Characteristics of Twin Half-rotating Impeller Tidal Turbine
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摘要: 双轮半转叶轮水轮机是一种新型双轮水轮机，为研究布局方式对其获能特性的影响，定义能效指数表征其获能特性。采用XFlow软件模拟分析旋向、布局参数对其能效指数的影响，对比分析单双轮半转叶轮水轮机的速度分布与叶片受力变化趋势，探讨双轮半转叶轮水轮机获能特性的增益机理。结果表明：双轮半转叶轮水轮机旋向为内对旋时，能效指数明显增大；相较于轴距，初始安装角对能效指数影响大；双轮半转叶轮水轮机的输出增益主要来源于顺流区叶片受到的阻力增大，当处于近优的布局参数时，其获能特性较单轮半转叶轮水轮机提高了22.4%。Abstract: Twin half-rotating impeller tidal turbine (THITT) is a new type twin impeller tidal turbine. To explore the influence of layout on its energy capture characteristics, the energy efficiency index was defined to mean its energy capture characteristics. XFlow software was used to simulate and analyze the influence of rotating direction and layout parameters on its energy efficiency index, compare and analyze the velocity distribution and blade force change trend of single half-rotating impeller tidal turbine (HRITT) and THITT, and explore the gain mechanism of energy acquisition characteristics of THITT. The results indicate that when the rotating direction of THITT is internal rotation, the energy efficiency index is significantly improved, and the initial installation angle has a greater influence on the energy efficiency index than that of the wheelbase. The output gain of THITT mainly comes from the increase of resistance of downstream blades. When the layout parameters are near optimal, its energy capture characteristics are 22.4% higher than that of HRITT.
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