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频域有限差分(FDFD)模型可以直接快速地计算内嵌管式围护结构的频域热特性。为了验证该模型的准确性,搭建了内嵌管式围护结构的实验测试平台。采用离散傅里叶变换将实测得到的边界条件展开成复指数形式表示的傅里叶级数,并代入到FDFD模型中进行计算、求解、变换,从而得到了内嵌管式围护结构的时域热响应。FDFD模型的计算结果与实验测量结果对比表明FDFD模型能准确地计算内嵌管式围护结构的动态热特性。
The frequency domain finite difference (FDFD) model can directly calculate the frequency-domain thermal characteristics of the embedded tubular enclosure. In order to verify the accuracy of the model, an experimental test platform with embedded tubular enclosure structure was built. The discrete Fourier transform is used to expand the measured boundary conditions into the Fourier series represented by complex exponentials, which are then substituted into the FDFD model for calculation, solution, and transformation, resulting in a time- Domain thermal response. The comparison between the FDFD model and the experimental results shows that the FDFD model can accurately calculate the dynamic thermal characteristics of the embedded tubular enclosure.