Abstract

Dependence of the combustion of a Ti + C granular charge on a granule size is experimentally studied. It is revealed that the burning rate of a granular mixture of all fractions used in the work is higher than the burning rate of a bulk-density powder mixture. It is shown that, with a decrease in the granule size, the burning rate of the charge in the absence of gas decreases due to an increase in the number of boundaries between the granules per unit length of the sample. A strong influence of the nitrogen flow on the burning rate of both coarse and fine granules is established. It is shown that, in contrast to fine granules, an increase in the nitrogen flow rate of coarse granules up to 600 liters/h leads to a transition to convective combustion. The studies performed indicate that, despite the structural analogy between mechanically activated and granular mixtures, the relationship between the combustion time and the front transition time in granular mixtures is completely different. This means that the combustion of granular mixtures even in the absence of a gas flow cannot be explained within the framework of a microheterogeneous model.

中文翻译：

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Ti + C颗粒尺寸对氮气流燃烧的影响

摘要

实验研究了Ti + C粒料的燃烧对颗粒尺寸的依赖性。结果表明，该工作中使用的所有馏分的颗粒状混合物的燃烧速率均高于堆密度粉末混合物的燃烧速率。结果表明，随着颗粒尺寸的减小，由于每单位样品长度的颗粒之间的边界数量增加，在没有气体的情况下，装料的燃烧速率降低。建立了氮流量对粗粒和细粒燃烧速率的强烈影响。结果表明，与细颗粒相反，粗颗粒的氮气流速提高到600升/小时会导致对流燃烧。进行的研究表明，尽管在机械活化和颗粒混合物之间存在结构上的类比，但颗粒混合物中燃烧时间与前沿转变时间之间的关系却完全不同。这意味着即使在没有气流的情况下，颗粒混合物的燃烧也无法在微异质模型的框架内进行解释。