模拟粒子云中的辐射：关于粉状固体燃料燃烧的粒子间辐射的重要性
Modeling radiation in particle clouds: On the importance of inter-particle radiation for pulverized solid fuel combustion
摘要：
研究了颗粒间辐射对灰色和漫射颗粒团簇的重要性。每个单独的粒子的辐射冷却被发现随其在簇中的位置而强烈变化，并且提出了用于粒子簇的单粒子模拟或用于高细节模拟的平均辐射粒子冷却项，如大粒子簇的小子体积的直接数值模拟。辐射冷却对于煤气化炉和煤燃烧炉都很重要。拓宽颗粒尺寸分布被发现对辐射颗粒冷却只有很小的影响。对于大而致密的颗粒簇，情况尤其如此，其中基本上根本没有尺寸分布加宽的影响。对于更小和更稀的粒子团簇，分布加宽的效果是明显的，但仍然不是主导的。
英文摘要：
The importance of inter-particle radiation for clusters of gray and diffuse particles is investigated. The radiative cooling of each individual particle is found to vary strongly with its position in the cluster, and a mean radiative particle cooling term is proposed for single particle simulations of particle clusters or for high detail simulation, like Direct Numerical Simulations of small sub-volumes of large clusters of particles. Radiative cooling is shown to be important both for furnaces for coal gasification and coal combustion. Broadening the particle size distribution is found to have just a minor effect on the radiative particle cooling. This is particularly the case for large and dense particle clusters where there is essentially no effect of size distribution broadening at all. For smaller and more dilute particle clusters, the effect of distribution broadening is clear but still not dominant.
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