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为了研究碳纤维类高温防隔热复合材料中热辐射传输特性及对其传热性能的影响,采用数值模拟的方法,针对2维(2-D),2.5维(2.5-D)编织的碳纤维复合材料的光谱辐射特性进行了研究。通过对比时域有限差分法(FDTD)和Mie氏理论计算的微米级尺度下单根无限长圆柱的散射强度分布,验证FDTD计算碳纤维热辐射特性的正确性。采用FDTD分析了编织方式、纤维特征尺寸、纵向层数、纤维间隔及基质折射率对其辐射性质的影响。研究发现,均质块材与实际编织结构的块材光谱辐射特性差异明显,散射强度分布差异可达2个量级。
In order to study the heat radiation transmission characteristics and its heat transfer performance in carbon fiber high temperature anti-thermal insulation composite materials, a numerical simulation method was adopted to investigate the effects of 2-D and 2.5-D braided carbon fiber composites The spectral radiation characteristics of the material were studied. By comparing the scattering intensity distribution of a single infinite cylinder with the micron scale calculated by the finite-difference time-domain (FDTD) and Mie’s theory, the correctness of calculating the thermal radiation characteristics of carbon fiber by FDTD is verified. The effects of weaving method, fiber feature size, longitudinal number of layers, fiber spacing and matrix refractive index on the radiation properties were analyzed by FDTD. The results show that there are obvious differences in the spectral radiance characteristics of the block between the homogeneous block and the actual braided structure, and the difference of the scattering intensity distribution can reach up to two orders of magnitude.