Dynamic stall at high Reynolds numbers induced by ramp-type pitching motions
Dynamic stall at high Reynolds numbers induced by ramp-type pitching motions
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斜坡型俯仰运动引起的高雷诺数动态失速
DOI：
10.1017/jfm.2022.70
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发表时间：
2022
影响因子：
3.7
通讯作者：
Hultmark, Marcus
中科院分区：
文献类型：
--
作者：
Kiefer, Janik;Brunner, Claudia E.;Hansen, Martin O.L.;Hultmark, Marcus
研究了中等厚度翼型在高雷诺数和低马赫数条件下斜坡型俯仰运动时的瞬态压力场。在高压风洞中进行了一组独特的室内实验，以研究弦雷诺数范围内的动态失速。与参数变化无关，所有测试用例都表现出几乎相同的失速行为，其特征是逐渐的尾缘失速，其中动态失速涡大约在弦中形成。找到了俯仰窗口相对于雷诺数相关的静态失速角的位置，以定义失速过程的时间发展。直至失速开始的时间以幂律为特征，其中静态失速角的微小过剩会导致急剧延长的失速延迟。在角度有限俯仰操纵的情况下，减少的频率对失速发展的影响有所减少。超过临界降频后，载荷大小和涡旋演化都变得与降频无关，而分别取决于运动的几何形状和对流时间尺度。总体而言，动态失速诱导的涡演化特征与Gharib等人报道的最优涡形成框架具有显著的相似性。，第360卷，1998，第121-140页)。这项研究的数据可在https://doi.org/10.34770/b3vq-sw14上公开获取。
The transient pressure field around a moderately thick airfoil is studied as it undergoes ramp-type pitching motions at high Reynolds numbers and low Mach numbers. A unique set of laboratory experiments were performed in a high-pressure wind tunnel to investigate dynamic stall at chord Reynolds numbers in the range of were studied by means of surface-pressure measurements. Independently of the parameter variations, all test cases exhibit a nearly identical stall behaviour characterized by a gradual trailing-edge stall, in which the dynamic stall vortex forms approximately at mid-chord. The location of the pitching window with respect to the Reynolds-number-dependent static stall angle is found to define the temporal development of the stall process. The time until stall onset is characterized by a power law, where a small excess of the static stall angle results in a drastically prolonged stall delay. The reduced frequency exhibits a decrease in impact on the stall development in the case of angle-limited pitching manoeuvres. Beyond a critical reduced frequency, both load magnitudes and vortex evolution become reduced frequency independent and instead depend on the geometry of the motion and the convective time scale, respectively. Overall, the characteristics of vortex evolution induced by dynamic stall show remarkable similarities to the framework of optimal vortex formation reported in Gharib et al. (J. Fluid Mech., vol. 360, 1998, pp. 121–140). The data from this study are publicly available at https://doi.org/10.34770/b3vq-sw14.
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由于翼型运动的不同类型，高雷诺数下的动态失速
DOI：
10.1088/1742-6596/1618/5/052028
发表时间：
2020
期刊：
Journal of Physics: Conference Series
影响因子：
--
作者：
Kiefer, J;Brunner, C E;Hultmark, M;Hansen, MOL
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.7
作者：
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通讯作者：
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DOI：
--
发表时间：
1974
期刊：
影响因子：
--
作者：
F. Carta
通讯作者：
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影响因子：
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作者：
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通讯作者：
Tropea