The estimation of pressure on the surface of a flapping rigid plate by stereo PIV
The estimation of pressure on the surface of a flapping rigid plate by stereo PIV
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DOI：
10.1007/s00348-011-1150-y
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发表时间：
2011-11-01
影响因子：
2.4
通讯作者：
Obi, Shinnosuke
中科院分区：
文献类型：
--
作者：
Suryadi, Alexandre;Obi, Shinnosuke
本文讨论了利用扑翼表面压力积分估算扑翼动载荷的方法。将扑翼模型化为悬停状态下板的正弦扑动。采用立体PIV技术，在离面方向沿着多个测量平面上对扑翼板绕流进行了测量。计算每个测量平面的相位平均速度场，以便可以应用三维分析。相位平均的压力场是从三维泊松方程的压力，使用从立体PIV测量获得的可用信息的集成。压力场在测量平面上可视化。在本研究中，估计载荷为旋转轴的扭矩。将该扭矩与应变仪测量的结果进行比较。尽管仅在接骨板的部分表面上进行了扭矩估计，但扭矩估计值与实测扭矩在合理范围内。基于立体PIV测量和扭矩估计的泊松方程的集成表明，在一个扑动冲程开始时的扭矩增加是由板的表面上的停滞引起的，从流诱导的前缘涡。
The method to estimate the dynamic load of a flapping wing by the integration of pressure on the wing's surface is discussed. The flapping wing was modeled as a plate flapping sinusoidally in hovering condition. The flow around the flapping plate was measured using stereo PIV on multiple measurement planes along the out-of-plane direction. The phase-averaged velocity field of each measurement plane was calculated so that three-dimensional analyses could be applied. The phase-averaged pressure field was obtained from the integration of the three-dimensional Poisson equation for pressure using the available information acquired from stereo PIV measurements. The pressure field is visualized on the measurement planes. In this study, the estimated load was the torque of the axis of rotation. This torque was compared with the result from strain gauge measurements. The torque estimation, although only on a partial surface of the plate, is within reasonable agreement with the measured torque. The integration of the Poisson equation based on stereo PIV measurements and estimations of the torque shows that an increase in the torque at the start of a flapping stroke is caused by the stagnation on the surface of the plate from the flow that is induced by the leading-edge vortices.