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潮流能水平轴叶轮纵摇运动水动力分析

DOI: 10.3969/j.issn.1006-7043.201403015

Keywords: 潮流能, 水平轴叶轮, 强迫纵摇, 水动力载荷, 阻尼系数, 计算流体力学

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Abstract:

漂浮式潮流能装置载体的波浪运动响应使水平轴叶轮的水动力特性发生变化.采用滑移网格及动网格技术对无界均匀来流中旋转叶轮强迫纵摇时的三维水动力特性进行分析,研究不同纵摇频率、纵摇幅值、速比等参数对叶轮水动力的影响规律,以及根据叶轮纵摇运动时的水动力时历曲线,拟合得到叶轮的纵摇阻尼系数.研究表明:叶轮轴向载荷和能量利用率瞬时值产生波动,波动幅值随纵摇频率、纵摇幅值及速比的增大而增大;叶片表面压力分布时刻发生变化,纵摇频率、纵摇幅值及速比越大,变化越明显;纵摇阻尼系数与纵荡频率、振幅无关,而与叶轮旋转速度相关,旋转速度越大,阻尼系数越大.

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