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首页> 外文期刊>AIAA Journal >Lift Enhancement over Flexible Nonslender Delta Wings
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Lift Enhancement over Flexible Nonslender Delta Wings

机译：柔性不修长三角翼的提升能力

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摘要

Unsteady aerodynamics of flexible nonslender delta wings is investigated in an experimental study using various techniques. Dramatic fluid/structure interactions emerge with increasing wing flexibility and result in substantial lift enhancement in the poststall region. This recently discovered phenomenon appears to be a feature of nonslender wings. Self-excited antisymmetric vibrations of the wing promote reattachment of the shear layer, which results in the lift enhancement. These self-excited vibrations are not observed for a half-model. The Strouhal number of the dominant frequency of the structural vibration is on the order of unity for all nonslender wings, which also corresponds to the frequency of the shear-layer instabilities for the rigid wing. Velocity measurements demonstrate the striking difference between the flows over the flexible and rigid wings in the poststall region. The effect of flexibility is to promote the reattachment of the shear layer near or downstream of the apex, depending on the incidence. There are substantial effects on the vortical flow with increasing wing flexibility, which might lead to the axial flow developing within the reattached region. The time-averaged vorticity flux increases due to the oscillating leading edge, which leads to increased circulation.
机译：使用各种技术在实验研究中研究了柔性非细长三角翼的非定常空气动力学特性。随着机翼柔性的增加，出现了剧烈的流体/结构相互作用，并导致后失速区域的升力大大提高。最近发现的这种现象似乎是机翼不细长的特征。机翼的自激抗对称振动促进了剪切层的重新附着，从而增强了升力。对于半模型，未观察到这些自激振动。对于所有非细长机翼，结构振动的主导频率的Strouhal数约为1，这也对应于刚性机翼的剪切层不稳定性的频率。速度测量结果表明，在失速后区域中，柔性和刚性机翼上的流动之间存在显着差异。柔韧性的作用是促进剪切层在顶点附近或下游重新附着，这取决于发生率。随着机翼柔性的增加，旋涡流动受到实质性影响，这可能导致轴向流动在重新附着区域内发展。由于振荡的前缘，时间平均涡流增加，这导致循环增加。

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