燃料床特性对炭粉阴燃过程影响的理论预测  

Prediction of Effects of Fuel Bed Properties on Smoldering of Char

作　　者：何芳[1] 徐攀[1] 闸建文[1] 

机构地区：[1]山东理工大学轻工与农业工程学院,淄博255091

出　　处：《燃烧科学与技术》2009年第6期497-504,共8页Journal of Combustion Science and Technology

基　　金：山东省自然科学基金资助项目(2004ZX21);德国学术交流中心(DAAD)王宽诚基金资助项目

摘　　要：建立了自然对流(静止空气)条件下炭粉床一维竖直向下阴燃的简化数学模型,预测了典型条件下燃料床各特性参数对阴燃过程的影响.结果表明,床层收缩率、碳堆积密度、燃料床孔隙尺寸、氧气在多孔灰层中的扩散率对阴燃传播速度、床层内部温度和阴燃持续时间影响显著;而初始条件、环境条件及燃料和灰的比热容、导热系数等物性参数的影响可忽略不计.A simplified 1-D model has been developed to describe natural downward smoldering of char. The effects of fuel bed properties on smoldering of char under the typical condition have been predicted. The results showed that propagation velocity of the smoldering process, temperature inside the bed and duration time of smoldering were significanlty affected by shrinkage of the bed, bulk density of carbon, void size in the fuel bed and oxygen diffusivity in ash bed. While the effects of initial condition, environmental condition and fuel bed properties such as specific heat and heat conductivity were negligible.

关 键 词：炭粉 阴燃 燃料床 特性参数 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]