Leading-edge tubercles delay flow separation for a tapered swept-back wing at very low Reynolds number
Leading-edge tubercles delay flow separation for a tapered swept-back wing at very low Reynolds number
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前缘结节在非常低的雷诺数下延迟了锥形后掠翼的流动分离
DOI：
10.1016/j.oceaneng.2019.04.018
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发表时间：
2019-06
影响因子：
5
通讯作者：
Zhang Yanni
中科院分区：
文献类型：
--
作者：
Wei Zhaoyu;New T. H.;Lian Lian;Zhang Yanni
采用时间分辨粒子图像测速技术(tr-PIV)，在水洞中研究了两个锥形后掠翼的流动分离特性，其中一个前缘是直的，另一个前缘是节理的。双翼采用SD7032型翼型，雷诺数Re = 为1.4 × 104型，接近普通水下滑翔机的工作状态。叶小节的设计是这样的：从翼根到翼尖，振幅线性下降，同时保持恒定的波长。结果表明，在俯仰角为10°和20°时，基线机翼的外翼区有明显的分离流动，而由于局部雷诺数较大，内翼区的流动仍然是附着的。LE结节的实施可以缓解波谷和波峰下游的流动分离。在较大的俯仰角下，分离的流动覆盖了大部分基线翼面，而流动仍然附着在大部分结节尖端的下游。由于结节两侧的扫掠和幅度的差异，结节上形成的流向排列的对旋涡对(CVP)具有明显的倾斜和不对称。因此，靠近翼根的CVPS中较弱的涡被迅速消散，使得CVPS演变成一系列同旋涡(CV)，这对结节下游的流动分离特性产生了显著影响。
Flow separation characteristics for two tapered swept-back wings, one with straight leading-edge (LE) and the other with tubercled LE, were investigated in a water tunnel using time-resolved particle image velocimetry (TR-PIV) technique. The two wings were based on the SD7032 aerofoil profile, with Reynolds number Re = 1.4 × 104, close to the working condition for common underwater gliders. The LE tubercles were designed such that the amplitude decreased linearly from the wing root to wing tip, while retaining constant wavelength. Results indicate that the baseline wing shows significantly separated flow in the outboard region at pitch angle of 10° and 20°, and the flow remains attached in the inboard region due to relatively larger local Reynolds number. Implementation of LE tubercles can mitigate flow separation downstream of both troughs and peaks. At higher pitch angles, the separated flows cover most of the baseline wing surface, whereas flow remains attached downstream most of tubercle peaks. Streamwise aligned counter-rotating vortex pairs (CVPs) formed over the tubercles are significantly tilted and asymmetrical due to the sweep and amplitude difference between the two sides of tubercle. Consequently, weaker vortices in CVPs close to the wing root are rapidly dissipated, allowing the CVPs to evolve into a series of co-rotating vortices (CVs), which exerted significant impact on flow separation characteristics downstream of the tubercles.
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影响因子：
5.6
作者：
M. D. Bolzon;R. Kelso;M. Arjomandi
通讯作者：
M. D. Bolzon;R. Kelso;M. Arjomandi
DOI：
--
发表时间：
2016-01
期刊：
World Academy of Science, Engineering and Technology, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering
影响因子：
--
作者：
J. Joy;T. New;I. Ibrahim
通讯作者：
J. Joy;T. New;I. Ibrahim
通过前缘结节增强锥形后掠翼的流体动力性能
影响因子：
2.4
作者：
Wei Zhaoyu;Lian Lian;Zhong Yisen
通讯作者：
Zhong Yisen
影响因子：
2.5
作者：
D. Custodio;C. Henoch;H. Johari
通讯作者：
D. Custodio;C. Henoch;H. Johari
影响因子：
5
作者：
Zhaoyu Wei;T. New;Y. Cui
通讯作者：
Zhaoyu Wei;T. New;Y. Cui