【摘要】 通过FLUENT6.2流体计算软件,采用雷诺应力模型对直径D=500mm、具有不同出口结构的粗旋气相流场进行了数值模拟,分析了升气管和料腿长度对粗旋流场和性能的影响.模拟结果表明,具有较长升气管的粗旋,其内部流动形式更加稳定.料腿长度改变,粗旋内大部分区域的流场不发生改变,仅料腿内的流动变化明显.升气管长度lr、料腿长度lc改变造成粗旋压降的波动不大,但两者过短会引起料腿下排气量不同程度的增大;以获得稳定流场和减小料腿的下排气量为原则,确定两者长度的取值范围为lr≥1.4D,lc≥1.2D.更多还原

【Abstract】 The flow field in a 500 mm rough cyclone separator with different outlet structures was numerically simulated using RSM model on the platform of commercial CFD software package,FLUENT 6.2.The impact of different lengths of exit tube and lengths of dipleg on the flow field of rough cyclone was analyzed.The simulation results showed that the rough cyclone with longer exit tube was more likely to form a steady inside flow.Flow field within the rough cyclone changed slightly except that inside the dipleg when length of the dipleg was changed.It was also revealed that both the length of the exit tube and that of the dipleg brought little fluctuation of pressure drop in the separator,but exerted a distinct influence on downward flux distribution of the two outlets.It was proposed to choose the lengths on the principle of achieving steady flow field inside the cyclone and reducing gas emitted from the dipleg.That was,exit tube should not be shorter than 1.4D and dipleg should be longer than 1.2D.更多还原