Turbulent friction drag reduction using electroactive polymer and electromagnetically driven surfaces
Turbulent friction drag reduction using electroactive polymer and electromagnetically driven surfaces
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DOI：
10.1007/s00348-012-1441-y
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发表时间：
2013-01-01
影响因子：
2.4
通讯作者：
Morrison, Jonathan F.
中科院分区：
文献类型：
--
作者：
Gouder, Kevin;Potter, Mark;Morrison, Jonathan F.
这项工作报告了两个展向振荡表面的空气动力学测试，这些表面由电活性聚合物（EAPs）制成，以电介质形式驱动，并由电磁驱动的直线电机驱动。介绍了用热线和PIV测量速度和用阻力平衡直接测量摩擦阻力的方法。通过计算壁面法向流速梯度的减小，得到了最大16%的表面摩擦减小。除其他量外，还研究了减阻的空间依赖性。当考虑到这种空间瞬态和静态部分时，直接阻力测量可以补充热线数据。PIV测量，其中激光束平行于振荡表面在y（+）近似15，支持热线数据。这两个执行器在设计上是原创的，对eap的发展做出了重大贡献。该实验是第一次在如此大的规模和相对适中的Re下对EAP执行器进行空气动力学测试。
This work reports aerodynamic testing of two spanwise-oscillating surfaces fabricated out of electroactive polymers (EAPs) in the dielectric form of actuation, and of an electromagnetic-driven linear motor. Hot-wire and PIV measurements of velocity and direct measurement of friction drag using a drag balance are presented. A maximum of 16 % surface friction reduction, as calculated by the diminution of the wall-normal streamwise velocity gradient, was obtained. Among other quantities, the spatial dependence of the drag reduction was investigated. When this spatial transient and portions which are static are accounted for, the direct drag measurements complement the hot-wire data. PIV measurements, where the laser beam was parallel to the oscillating surface at y(+) approximate to 15, support the hot-wire data. The two actuators are original in design, and significant contributions have been made to the development of EAPs. This experiment is the first to aerodynamically test EAP actuators at such a large scale and at a relatively moderate Re.