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气固两相流动中非球形颗粒所受曳力的数值研究.pdf

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!!!!!!! ! 研究论文 ! 气固两相流动中非球形颗粒所受曳力的数值研究 ! !!!!!! 由长福 祁海鹰 徐旭常 (清华大学煤的清洁燃烧技术国家重点实验室,北京 100084 ) 摘 要 采用数值计算的方法研究了非球形颗粒在气固两相流动中所受的曳力,在 的条件下对流经 种 Re 100 3 具有典型几何特征的非球形颗粒 (正方体、圆柱体和圆台体)的流体流动进行了详细的数值计算. 通过比较计 算结果与文献中所推荐的 种曳力系数修正关系发现: 方法与本文计算结果符合最好 通过对两种不同颗 3 Ganser . 粒摆放条件的流动进行计算发现:对于不同的颗粒与来流角度,非球形颗粒所受到的曳力具有较大的差别. 关键词 非球形颗粒 曳力 数值计算 中图分类号 文献标识码 文章编号 ( ) O3 A 0438 - 1157 2003 02 - 0188 - 04 NUMERICAL SIMULATION OF DRAG FORCE ON NON-SPHERICAL PARTICLE IN GAS-PARTICLE TWO-PHASE FLOW YOU Changfu,OI Haiying and XU Xuchang ( , , , ) State Key Laboratory of Clean Combustion of Coal Tsinghua Uniuersity Beij ing 100084 China Abstract Study of the effect of non-sphericai particie on drag force was carried out by using numericai simuiation . At Re , ( , ) 100 the fiow over three different non-sphericai particies cube cyiinder and frustum was caicuiated with N-S eguations. In particuiar,three promising correiations for the drag coefficient of non-sphericai particie were criticaiiy examined with the computationai resuits . The best method appeared to be that of Ganser which used the eguai voiume sphere diameter and the sphericity of particie . Comparing the resui
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