多相燃烧分形模型及其实验研究

FRACTAL MODEL ON MULTI-PHASE COMBUSTION AND EXPERIMENTAL RESEARCH

本文提出了多相燃烧的分形模型．模型中认为在多相燃烧中内部孔洞体积与表面积存在分维指数关系，而且反应面积的增长为两种分形增长模式的叠加．结合孔洞合并的因素得到了描述煤多相反应速率的分形模型．该模型描述的反应速率先增加后减少的规律与实验结果十分相符．对五个煤种和其中两个煤焦样品进行了试验研究，在两个不同升温速率下得出的试验数据与理论计算相符．

A fractal model on multi-phase combustion is proposed. In this model it is consideredthat there exists a fractal power correlation between the pore volume and pore surface. Be-sides, the increase of reaction area is the addition of two fractal growth styles. In combinationwith the consideration of the pore amalgamate, a fractal model of heterogeneous combustionis concluded. The reaction rate described by this model, which increases at the beginningand decrease at last, conforms to the experiment results well. Five kinds of coal and twokinds of coal char are tested under two different temperature rising velocity. The experimentdata are in keeping with the theoretical calculation perfectly.