PIV investigation of flowfield behind perforated Gurney-type flaps
PIV investigation of flowfield behind perforated Gurney-type flaps
复制标题
穿孔 Gurney 型皮瓣后流场的 PIV 研究
DOI：
10.1007/s00348-008-0606-1
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发表时间：
2009
影响因子：
2.4
通讯作者：
L. Ko
中科院分区：
文献类型：
--
作者：
Tim Lee;L. Ko
在Re = 5.3 × 104条件下，采用粒子图像测速技术（PIV）研究了穿孔格尼型襟翼后的流动。PIV测量数据由力平衡和表面压力数据补充。随着襟翼穿孔的增加，近尾流被破坏并变窄，表明阻力减小，并且波动强度被大大抑制。根据穿孔产生的射流的强度，可以消除襟翼后面的旋涡脱落过程。与实体皮瓣相比，皮瓣孔隙度也导致正面弯曲效应的减少和腔流（皮瓣上游）的减压，以及上下表面压力的降低。然而，阻力的减少超过了升力的损失，并提高了升阻比。
The flow behind perforated Gurney-type flaps was investigated by using particle image velocimetry (PIV) at Re = 5.3 × 104. The PIV measurements were supplemented by force balance and surface pressure data. The near wake was disrupted and narrowed, indicative of a reduced drag, with increasing flap perforation and had a drastically suppressed fluctuating intensity. Depending on the strength of the perforation-generated jet, the vortex shedding process behind the flap could be eliminated. The flap porosity also led to reduced positive camber effects and the decompression of the cavity flow (upstream of the flap), as well as decreased upper and lower surface pressures, compared to the solid flap. The reduction in the drag, however, outweighed the loss in lift and rendered an improved lift-to-drag ratio.