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粒径对弯管气固两相流动影响的数值分析
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【电力评职称论文】 摘 要:气固两相流体流经弯管时,在弯管内外两侧形成压差。已有的文献表明,该压差大小与气固两相流的混合浓度Pm 、气相流速、固相流速、弯管的曲率半径 R 、弯管直径(或水力直径)D等因素有关。一定条件下的固相颗粒对气相具有使其湍流强度抑制和加强两种作用,在分别对其进行数值模拟研究时发现:压差除受上述诸因素影响外,无论是在气相湍流抑制区还是湍流加强区,颗粒粒径对压差也具有较大的影响,尤其是颗粒粒径越小这种影响越显著,从理论上分析并解释了形成这种现象的原因,提出了以固相浓度为参变数的弯管内外两侧压差随颗粒粒径的变化的关联式。 关键词:弯管;气固两相流;压差;粒径; K-ε 模型 1 INTRODUCTION In recent years, gas-solid two-phase flow is an active research field in the subject of thermophysics engineering; it is also an applied fundamental research task that is brought forward for the science kingdom by the engineering kingdom. Gas-solid two-phase flow can be applied widely in many engineering fields (such as pneumatic transport, wind machine contain-ing dust, gas turbine, solid fuel rocket etc.). As a jumped-up embr
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