An Ultra-Fast TSP on a CNT Heating Layer for Unsteady Temperature and Heat Flux Measurements in Subsonic Flows.
An Ultra-Fast TSP on a CNT Heating Layer for Unsteady Temperature and Heat Flux Measurements in Subsonic Flows.
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DOI：
10.3390/s22020657
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发表时间：
2022-01-15
期刊：
影响因子：
--
通讯作者：
Niehuis R
中科院分区：
文献类型：
--
作者：
Bitter M;Hilfer M;Schubert T;Klein C;Niehuis R
在本文中，作者演示了一种改性Ru（phen）基温度敏感涂料的应用，该涂料最初是为评估高马赫数但持续时间短的实验中的非定常气动热力学现象而开发的。在目前的工作中，温度灵敏度高达-5.6%/K的改进TSP应用于低压环境中的低马赫数长时间试验情况。为了演示该涂料的性能，在高速叶栅风洞（HGK）中设置了一个装有圆柱体的平板。该测试用例旨在产生高达4300 Hz的旋涡脱落频率，使用高速摄像机以40 kHz帧率进行采样，以解析非稳态表面温度场，用于潜在热传递估计。实验是在= 13.8 kPa的降低环境压力下进行的，三个来流马赫数为。为了能够以高的空间和时间分辨率实现非常低的温度波动的分辨率，低至K的噪声基底，平板模型配备了可喷涂的碳纳米管（CNT）加热层。这个星座，连同热传感器纳入模型，允许计算准传热系数从表面温度场。除了实验结果外，本文还重点介绍了改进的TSP的性质以及方法。
In this paper, the authors demonstrate the application of a modified Ru(phen)-based temperature-sensitive paint which was originally developed for the evaluation of unsteady aero-thermodynamic phenomena in high Mach number but short duration experiments. In the present work, the modified TSP with a temperature sensitivity of up to −5.6%/K was applied in a low Mach number long-duration test case in a low-pressure environment. For the demonstration of the paint’s performance, a flat plate with a mounted cylinder was set up in the High-Speed Cascade Wind Tunnel (HGK). The test case was designed to generate vortex shedding frequencies up to 4300 Hz which were sampled using a high-speed camera at 40 kHz frame rate to resolve unsteady surface temperature fields for potential heat-transfer estimations. The experiments were carried out at reduced ambient pressure of = 13.8 kPa for three inflow Mach numbers being . In order to enable the resolution of very low temperature fluctuations down to the noise floor of K with high spatial and temporal resolution, the flat plate model was equipped with a sprayable carbon nanotube (CNT) heating layer. This constellation, together with the thermal sensors incorporated in the model, allowed for the calculation of a quasi-heat-transfer coefficient from the surface temperature fields. Besides the results of the experiments, the paper highlights the properties of the modified TSP as well as the methodology.
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