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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Wiener filtering technique applied to thermographic data reduction intended for the estimation of plate fins performance
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Wiener filtering technique applied to thermographic data reduction intended for the estimation of plate fins performance

机译：应用于热成像数据约简的维纳滤波技术，旨在评估板翅片的性能

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摘要

The present work deals with the optimization of a data processing technique aimed to the estimation of local heat transfer coefficient in plate fin commonly used in compact heat exchangers. When the assumption of uniform heat flux boundary condition cannot be made, the convective heat transfer coefficient distribution on thin fins may be recovered by solving the inverse heat conduction problem. The ill-posed nature of this problem has here been handled by pre-processing the raw temperature map, recorded with a high resolution infrared camera, with a filtering technique based on the Wiener filter. In order to increase the data processing efficiency, in the present work the algorithm by which the filter is usually implemented, has been modified. Basically, the filtering function here tested has been defined in such a way that only the pixels belonging to the measured temperature map are used, without any fictitious extrapolation of the signal. Besides, for the regions close to the boundaries, a variable size of the window used to perform the local statistical processing of the signal, has been used. This feature makes the filtering technique more suitable for processing low resolution images containing signal discontinuities. The estimation procedure has-been validated throughout its application to experimental data regarding the usual plate fin and tube configuration subject to parallel air flow. (C) 2003 Elsevier Inc. All rights reserved. [References: 6]
机译：本工作涉及数据处理技术的优化，该技术旨在估算紧凑型热交换器中常用的板翅片中的局部传热系数。当无法假定均匀的热通量边界条件时，可以通过解决逆导热问题来恢复薄翅片上的对流传热系数分布。在此问题的不适定性已通过使用基于维纳滤镜的滤波技术对用高分辨率红外摄像机记录的原始温度图进行预处理得到了解决。为了提高数据处理效率，在当前工作中，通常实现滤波器的算法已被修改。基本上，此处测试的滤波功能已定义为仅使用属于所测温度图的像素，而无需对信号进行任何虚拟外推。此外，对于靠近边界的区域，已经使用了用于执行信号的局部统计处理的窗口的可变大小。此功能使滤波技术更适合处理包含信号不连续性的低分辨率图像。在整个应用过程中，该估计程序已经得到验证，有关实验数据是关于受平行气流影响的常用板翅和管结构的。 （C）2003 Elsevier Inc.保留所有权利。 [参考：6]

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