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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >Experimental Investigation of Separated Shear Layer over a Flat Plate for Various Angles of Attack and Tail Flap Deflections
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Experimental Investigation of Separated Shear Layer over a Flat Plate for Various Angles of Attack and Tail Flap Deflections

机译：平板上分开的剪切层对各种迎角和尾翼挠度的实验研究

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摘要

Shear layer development over a thick flat plate with a semicircular leading edge is investigated for a range of angles of attack under different imposed pressure gradients for a Reynolds number of 2.44×10~5 (based on chord and free-stream velocity). The features of the separated shear layer are very well documented through a combination of surface pressure measurement and flow visualization by particle image velocimetry (PIV). The instability of the separated layer occurs because of enhanced receptivity of perturbations leading to the development of significant unsteadiness and three-dimensional motions in the second-half of the bubble. The onset of separation, transition and the point of reattachment are identified for varying angles of attack and imposed pressure gradients. The reattachment point shifts from 12.5% to 53% of chord resulting in enhancement of bubble length from 5% to 47%, while onset of transition shifts upstream from 14% to 7.5% as α increases. The Reynolds number based on the length of laminar shear layer is found to be in the range of 0.7× 10~4 to 2.0×10~4. The separated shear layer fails to reattach attributing to bubble bursting at α = 12~0 for β = -45~0, while, it bursts at α = 5~0 for β = +45~0. The bubble falls in the category of short bubble for α ＜ 3~0, whereas, it becomes long for α ≥ 3~0. The data concerning laminar portion and reattachment points agree well with the literature.
机译：对于2.44×10〜5的雷诺数（基于弦速和自由流速度），研究了在不同的施加压力梯度下，攻角在一定范围内的攻角范围，从而研究了具有半圆形前缘的厚平板上的剪切层的发展。通过表面压力测量和通过颗粒图像测速（PIV）进行的流动可视化相结合，很好地证明了分离的剪切层的特征。分离层的不稳定性是由于扰动的接受性增强，导致气泡的后半部分出现明显的不稳定和三维运动。对于不同的迎角和施加的压力梯度，确定了分离，过渡和重新连接的起点。重新连接点从弦的12.5％变为53％，导致气泡长度从5％增大为47％，而过渡的开始随着α的增加从14％过渡到7.5％。发现基于层状剪切层的长度的雷诺数在0.7×10〜4至2.0×10〜4的范围内。对于β= -45〜0，分离的剪切层不能重新归因于气泡在α= 12〜0破裂，而对于β= + 45〜0，它在α= 5〜0破裂。当α＜3〜0时，气泡属于短气泡类别，而当α≥3〜0时，气泡变为长气泡。有关层流部分和重新连接点的数据与文献非常吻合。

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