Comparison of Laminar Separation Bubble Measurements on a Low Reynolds Number Airfoil in Three Facilities
Comparison of Laminar Separation Bubble Measurements on a Low Reynolds Number Airfoil in Three Facilities
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DOI：
10.2514/6.2005-5149
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发表时间：
2005-06
影响因子：
2.8
通讯作者：
M. Ol;Brian McCauliffe;E. Hanff;U. Scholz;C. Kaehler
中科院分区：
文献类型：
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作者：
M. Ol;Brian McCauliffe;E. Hanff;U. Scholz;C. Kaehler
本文描述了在三个不同设施中进行的 SD7003 翼型的一系列实验：低湍流风洞、水洞和拖车水箱。试图实现模型几何、雷诺数和测试条件的通用性，以便直接比较实验结果。选择 SD7003 翼型是因为其坚固、薄的层流分离气泡，这对当前粒子图像测速 (PIV) 方法精确解析近壁流场的能力提出了挑战。比较了分离、重新附着和过渡的弦向位置。由于时间平均气泡几何形状是流场环境湍流水平的强函数，因此气泡几何形状的比较可以对设施流动质量进行一些评估，从而对低雷诺数测试的设施适用性进行评估。
This paper describes a series of experiments on the SD7003 airfoil, conducted in three different facilities: a low-turbulence wind tunnel, a water tunnel, and a tow tank. An attempt was made to achieve commonality of model geometry, Reynolds number and test conditions, in order to directly compare the experimental results. The SD7003 airfoil was chosen because of its robust, thin laminar separation bubble, which challenges the capability of current Particle Image Velocimetry (PIV) methods to accurately resolve the near-wall flowfield. Chordwise locations of separation, reattachment, and transition were compared. Since the time-averaged bubble geometry is a strong function of the flowfield ambient turbulence level, comparison of bubble geometry gives some assessment of facility flow quality, and hence of facility suitability for low Reynolds number testing in general.