【摘要】 为了揭示叶片式抛送装置抛送玉米秸秆切碎段时内部复杂的气固多重耦合流动特性,使用计算流体力学软件fluent中的Eulerian模型对装置内部气固两相流场进行数值模拟。在高速摄像试验验证可行的基础上,对抛送装置的叶片数、叶片倾角及进料口物料体积浓度等参数对气固两相流场以及抛送物料的影响进行了数值分析,结果表明:4叶片较3和5叶片更有利于抛送物料;后倾10°叶片较前倾10°以及径向叶片更有利于抛送物料;进料口物料体积浓度变化仅改变整个区域物料分布浓度,对物料抛送速度影响不大。更多还原

【Abstract】 In order to reveal the characteristics of the solid-gas two-phase flow in an impeller blower,threedimensional simulation was performed by using FLUENT software with Eulerian model. Comparisons between simulated values and measured values of materials velocity at the discharge vertical pipe by high-speed video were made,and the reliability of the numerical simulation was verified. Meanwhile, Contrast simulations on variations in working parameters such as paddle numbers,angle of paddle slant,material-fed speed and volume fraction of solid phase were carried out. It is concluded that: 1) Impellers with 4 paddles were more favorable for throwing / blowing materials than3 and 5 paddles. 2) Impellers with paddles of backward slant 10° were more favorable for throwing / blowing materials than paddles of forward slant 10° and radial paddles. 3) The change of the volume fraction of solid phase at inlet has less influence on materials velocity; it only affects the volume fraction of solid phase at entire zone.更多还原