The research of structural influences on carbon fibrous composite material radiative spectral properties

In this work, aim to study carbon fibrous composite insulation materials' radiative spectral properties and the influences on heat transfer, using numerical simulation to calculate 2-dimension(2-D) and 2.5-dimension(2.5-D) micro-structural influences on carbon fibrous composite material spectral attenuation properties. The reliability of the result obtained from FDTD is proven by comparing the results of the scattering intensity distribution of the single carbon fiber with the Mie Theory approximation. Based on FDTD, this paper analyzes the influence of diameters, longitudinal structural layers, interval in horizontal and vertical as well as the back ground refractive index on the spectral attenuation properties of carbon fiber braided structure both in 2-Dimension (2-D) and 2.5-Dimension (2.5-D). We also discuss scattered differences in stagger and aligned arrangements respectively. Finally, it can be shown that different structures have their special radiative spectral properties, meanwhile, it is not accurate to regard the carbon fiber braided structure as the equiv-oluminal block, the maximum value of the different scattered intensity may up to two orders of magnitude.