摘要
本文基于等效光学常数的线性混合近似，采用均匀球体模型，对多孔炭粒在动力控制（等径变密度）燃烧下的发射率的演变进行了理论分析，并将其结果与扩散控制（等密度缩核）燃烧的结果作了比较。计算表明：对于１０μｍ以上的炭粒，在燃尽过程初期，颗粒的发射率无例外的有增大，在燃尽过程后期（Ｂ＞０．９），颗粒的发射率随燃尽而骤减；对于１０μｍ以下的小颗粒，颗粒的发射率将随燃尽过程而缓降；颗粒内部有炭核时，发射率的降低将慢于均匀燃尽的情况。
The linear mixing approximation of optical constants and the isotropic sphere model were applied to the analysis of absorption efficiency of burning char at kinetic control zone (Constant Diameter Model), while the coated sphere model for particle at surface diffusion control zone (Shrinking Core Model).It was found:for large char (D>10μm),the absorption of particle will increase at the initial stage of burn and decrease sharply near burned-out (B>0.9);for little particle (D<10μm),the absorption of particle will decrease with the loss of combustible matter;the difference between the two models is just that the latter will slow down the decrease of absorption with the existing of inner char core.
出处
《燃烧科学与技术》
CAS
CSCD
1996年第4期393-399,共7页
Journal of Combustion Science and Technology
基金
国家攀登计划
国家自然科学基金
关键词
焦炭
发射率
燃尽
结构
Char,Emissivity,Burn out,Physical structure
