Dynamic surface heat transfer and re-attachment flow measurement using luminescent molecular sensors
Dynamic surface heat transfer and re-attachment flow measurement using luminescent molecular sensors
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DOI：
10.1016/j.ijheatmasstransfer.2020.119684
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发表时间：
2020-07-01
影响因子：
5.2
通讯作者：
Asai, Keisuke
中科院分区：
文献类型：
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作者：
Chen, Lin;Kawase, Chiaki;Asai, Keisuke
发光分子传感器可作为感温涂料（TSP）或压敏涂料（PSP）分别用于温度或压力的测量，是近年来被证明是一种很有前途的表面质量测量技术。它在复杂表面的实验中具有很大的优势，能够给出表面通量和壁面剪应力等流场信息。本研究以发光分子感测器为温度探针，对后向台阶模型进行动态热传量测。在风洞试验中对后台阶后的流动分离和再附着效应进行了实验研究。实验系统由分子传感器标定系统、动态数据记录系统和数据处理系统组成。结果表明，再附着过程会形成一个低温区，从而给出清晰的流动温度场。动态温度场数据显示，重新附着位置约x/h = 5.7，这与油流测量以及以前的实验一致。对动态温度脉动数据进行了分析，得到了后台阶后流动和瞬态传热的振动情况，并将其用于分析表面壁面剪应力的变化。结果表明，目前的发光分子传感器方法能够定量测量表面传热和流体流动。(C)2020爱思唯尔有限公司保留所有权利。
Luminescent molecular sensors, which can be used as Temperature Sensitive Paint (TSP) or Pressure Sensitive Paint (PSP) in respective temperature or pressure measurements, has been proved to be one promising surface quantity measurement technology in recent years. It is advantageous in the experiments with complicated surface and is able to give flow field information such as surface flux and wall shear-stress. The current study is focused on the dynamic heat transfer measurement of a backward-facing step model, using luminescent molecular sensors as temperature probe. The effects of flow separation and re-attachment after a back-step model were experimentally discussed in wind tunnel tests. The experimental system was consisted of a molecular sensor calibration system, a dynamic data recording system and a data processing system. It is found that the reattachment process will form a low temperature region, which then gives the clear temperature field of the flow. Dynamic temperature field data show a re-attachment position around x/h = 5.7, which agrees well with oil-flow measurements as well as previous experiments. The dynamic temperature fluctuation data is discussed with the vibrations of flow and transient heat transfer behaviors after the backward step, which then is used in the analysis of surface wall shear-stress variations. It is concluded that the current luminescent molecular sensor method is capable of quantitative measurement for surface heat transfer and fluid flows. (C) 2020 Elsevier Ltd. All rights reserved.