Infrared thermography for detection of laminar–turbulent transition in low-speed wind tunnel testing
Infrared thermography for detection of laminar–turbulent transition in low-speed wind tunnel testing
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DOI：
10.1007/s00348-016-2162-4
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发表时间：
2016-04
影响因子：
2.4
通讯作者：
Liselle A. Joseph;Aurélien Borgoltz;W. Devenport
中科院分区：
文献类型：
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作者：
Liselle A. Joseph;Aurélien Borgoltz;W. Devenport
这项工作提出了一个系统的细节，用于实验识别层流到湍流的过渡，应用于大，金属模型在低速风洞试验中的红外热成像。过渡探测系统的关键元件包括灵敏度在7.5至14.0微米光谱范围内的红外摄像机和模型的薄绝缘涂层。在雷诺数Re = 1.5 × 106 ~ 3 × 106范围内对两个风力机叶片翼型进行了实验，验证了系统的逼真度。结果比较以及从表面压力分布和听诊器观测测量。然而，基于红外线的系统提供了模型上更广泛的条件和位置的数据。本文记载了红外跃迁探测系统的设计、实现和验证，这是一个迄今为止在文献中还没有广泛详细介绍的问题。
This work presents the details of a system for experimentally identifying laminar-to-turbulent transition using infrared thermography applied to large, metal models in low-speed wind tunnel tests. Key elements of the transition detection system include infrared cameras with sensitivity in the 7.5- to 14.0-µm spectral range and a thin, insulating coat for the model. The fidelity of the system was validated through experiments on two wind-turbine blade airfoil sections tested at Reynolds numbers betweenRe= 1.5 × 106and 3 × 106. Results compare well with measurements from surface pressure distributions and stethoscope observations. However, the infrared-based system provides data over a much broader range of conditions and locations on the model. This paper chronicles the design, implementation and validation of the infrared transition detection system, a subject which has not been widely detailed in the literature to date.