Flow characteristics of slat cove fillers
Flow characteristics of slat cove fillers
复制标题
板式凹口填料的流动特性
DOI：
10.1016/j.ast.2020.105789
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发表时间：
2020
影响因子：
5.6
通讯作者：
Kamliya Jawahar H
中科院分区：
文献类型：
--
作者：
Kamliya Jawahar H
摘要利用粒子图像测速技术对30P30N高升力翼型在有缝翼和无缝翼下的流动特性进行了实验测量。试验是在30P30N翼型上进行的，收缩弦c= 0.35，迎角α= 6 °和12 °，弦基雷诺数Re c= 7.0× 105。壁面压力脉动结果表明，板条凹填料的使用消除了板条音调噪声分量。平均流场的结果，如归一化的平均速度，雷诺应力分量，和湍流动能的基线，半缝翼内凹填料，缝翼内凹填料配置。流线的速度等值线结果表明缝翼腔内存在一个回流区。半板条内凹填料的使用减小了再循环区域的尺寸，并且板条内凹填料的使用消除了再循环区域。缝翼尾流的平均速度和湍流动能分布在三种试验构型之间没有显著差异。使用本征正交分解进一步分析粒子图像测速结果。结果表明，涡量的前两个具有最高能量的本征模包含在缝翼剪切层和涡脱落从缝翼尖的基线情况下。对于半缝翼内凹填充物和缝翼内凹填充物构型，由于使用缝翼内凹填充物抑制了涡脱落，所以能级分布在缝翼剪切层上。
Abstract Experimental measurements using Particle Image Velocimetry were carried out to understand the flow characteristics of a 30P30N high-lift airfoil with and without slat cove fillers. The tests were carried out for the 30P30N airfoil with a retracted chord of c= 0.35, at angles of attack of α= 6∘ and 12∘, and for a chord-based Reynolds number of R e c= 7.0× 10 5. The wall pressure fluctuation results show that the use of slat cove fillers eliminates the slat tonal noise component. The results of the mean flow fields such as the normalized mean velocity, Reynolds stress components, and turbulent kinetic energy are presented for the baseline, half-slat cove filler, and slat cove filler configurations. The velocity contour results with streamlines showed a recirculation region within the slat cavity. The use of the half-slat cove filler reduced the size of the recirculation region and the use of the slat cove filler eliminated the recirculation region. The mean velocity and turbulent kinetic energy profiles at the slat wake showed insignificant difference between the three tested configurations. The Particle Image Velocimetry results were further analyzed using Proper Orthogonal Decomposition. The results showed that the first two eigenmodes of the vorticity with the highest energy were contained within the slat shear layer and vortex shedding emanating from the slat cusp for the baseline case. The energy levels were distributed over the slat shear layer for the half-slat cove filler and slat cove filler configurations as the vortex shedding is suppressed by the use of the slat cove fillers.
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