IR thermography for dynamic detection of laminar-turbulent transition

IR thermography for dynamic detection of laminar-turbulent transition
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用于动态检测层流-湍流转变的红外热成像

DOI:
10.1007/s00348-016-2178-9
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发表时间:
2016
影响因子:
2.4
通讯作者:
Grundmann
Grundmann
中科院分区:
工程技术3区
文献类型:
--
作者:
Filius;Tropea;Grundmann

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本文研究了红外热像技术在层流-湍流转变动态检测中的应用。实验是在平板上进行的,速度为8-14米/S,层流边界层向湍流的转变是由一个频率高达10赫兹的扰动源强迫开启和关闭的。三种不同的加热技术用于应用流体和结构温度之间所需的差异:加热的铝结构用作内部结构加热技术,导电涂料用作表面有界的加热器,而红外加热器用作外部加热技术的示例。为了比较各种加热技术,引入了归一化方法,并分析了测量的红外摄像机信号的频率响应。最后,对不同的加热技术进行了比较,并讨论了对层流-湍流转变实验设计的影响。
This work investigates the potential of infrared (IR) thermography for the dynamic detection of laminar-turbulent transition. The experiments are conducted on a flat plate at velocities of 8–14 m/s, and the transition of the laminar boundary layer to turbulence is forced by a disturbance source which is turned on and off with frequencies up to 10 Hz. Three different heating techniques are used to apply the required difference between fluid and structure temperature: a heated aluminum structure is used as an internal structure heating technique, a conductive paint acts as a surface bounded heater, while an IR heater serves as an example for an external heating technique. For comparison of all heating techniques, a normalization is introduced and the frequency response of the measured IR camera signal is analyzed. Finally, the different heating techniques are compared and consequences for the design of experiments on laminar-turbulent transition are discussed.
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