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通过引入吸收性介质内粒子散射Mie理论,结合多弥散粒子系独立散射理论,针对孔隙具有修正Gamma分布规律的多孔陶瓷提出一种计算热辐射特性的方法,以氧化锆陶瓷为例分析了孔隙分布对热辐射特性的影响.结果表明孔隙分布规律和平均孔径对热辐射特性有显著影响.孔径趋于单弥散分布,将使衰减系数、散射反照率、非对称因子等参数减小,而孔径趋于指数分布,这些参数显著提高.当波长较小时,衰减系数随平均孔径先增大后减小,当波长较大时,衰减系数随平均孔径增大而减小;散射反照率和非对称因子均随平均孔径增大而增大.
By introducing Mie theory of particle scattering in absorptive medium and combining with the theory of independent scattering of multi-dispersed particles, a method of calculating heat radiation characteristics is proposed for porous ceramics with modified Gamma distribution. The zirconium oxide ceramics is taken as an example to analyze pore distribution On the thermal radiation characteristics.The results show that the pore size distribution and the average pore size have a significant effect on the thermal radiation characteristics.The aperture tends to a single dispersion distribution and will decrease the parameters of the attenuation coefficient, the scattering albedo and the asymmetry factor, At exponential distribution, these parameters are significantly increased.When the wavelength is small, the attenuation coefficient first increases and then decreases with the average aperture, and decreases with the increase of average aperture when the wavelength is larger. The scattering albedo and asymmetric factor Both increase with the average pore size.