Slat cove dynamics of multi-element airfoil at low Reynolds number
Slat cove dynamics of multi-element airfoil at low Reynolds number
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DOI：
10.1007/s11431-022-2308-7
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发表时间：
2023-03
期刊：
影响因子：
--
通讯作者：
Jiangsheng Wang;Yang Xu;Jinjun Wang
中科院分区：
文献类型：
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作者：
Jiangsheng Wang;Yang Xu;Jinjun Wang
采用时间分辨粒子图像测速技术（TR-PIV）研究了低雷诺数（Rec= 2.41 × 104和4.61 × 104）条件下二维30P30N多单元翼型板状凹周围的流动。讨论了攻角（α= 8°、12°和16°）对平均流动特性和涡动力学的影响。随着迎角的增大，板条凹内再环流的规模和板条尖切变层产生的脱落涡的强度普遍减小。时频联合分析表明，不同频率的扰动存在于板条尖剪切层中，它们触发板条尖剪切层不同的涡脱落模式。在高雷诺数（Rec~ 106）条件下，通常观察到的板状凹内的自持续振荡是引起不同频率扰动和相关涡旋动力学的原因。
The flow around the slat cove of a two-dimensional 30P30N multi-element airfoil is investigated with time-resolved particle image velocimetry (TR-PIV) at low Reynolds number (Rec= 2.41 × 104and 4.61 × 104). The effects of angle of attack (α= 8°, 12°, and 16°) on the mean flow characteristics and vortex dynamics are discussed. The size of the recirculation within the slat cove and the intensity of the shed vortices originating from the slat cusp shear layer are found to generally decrease as the angle of attack increases. The joint time-frequency analyses show that disturbances of different frequencies exist in the slat cusp shear layer and they trigger the different vortex shedding patterns of the slat cusp shear layer. The self-sustained oscillation within the slat cove, normally observed at high Reynolds number (Rec~ 106), is proved to be responsible for the disturbances of different frequencies and the related vortex dynamics in the current study.