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- 2017
二维鳐鱼模型的近壁面增推效应
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Abstract:
摘要 用二维波动翼型模拟鳐鱼的近壁游动，分析在壁面附近波动翼产生推力的机理和调节升力的机制，以及增推效应。计算结果发现：相对于无壁面的情形，近壁面的波动翼型尾缘脱涡强度增大，且交替脱出的正向和反向涡（反向冯·卡门涡街）间距略微增加，从而增大了推力；升力的调节主要依赖翼型的仰角，随着距离壁面高度的减小，需要适当增大仰角才能使升力为零；波幅和频率的提高都增强了波动翼的壁面效应。这意味着鳐鱼贴底游动时，推力得到增强，从而提高游速，但同时也需适当增大身体的仰角来维持与壁面的距离不变。
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