摘要：运用Fluent软件,采用双欧拉两相流模型和Gidaspow曳力模型建立某散装水泥罐计算流体动力模型,分别对充气流化过程和卸料过程罐体内的流场进行仿真模拟,以分析流化床的流化性能,为改进设计提供指导;罐体床层内水泥的体积分数表明流化床属于鼓泡床形式,与设计意图相符;罐内流场的速度分布显示流场处于非均匀流状态,且水泥颗粒并没有完全流态化,导致卸料结束时罐内仍有水泥残留。分析结果表明:卸料口直径为100~120 mm,高度取40~55 mm,流化床倾角取10~15°比较合适,且滑料板倾角必须大于40°。

关键词：流化性能；两相流；散装水泥车；Fluent 软件

Abstract：A gas-particle computational fluid dynamics flow model was developed to simulate the flow behavior in the three dimensional fluidized bed to evaluate fluidization performance of a bulk cement tank truck. The computational model was based on the Eulerian two-phase flow model. In the model, the Gidaspow drag coefficient model was applied to coupling force between the gas and solid phases. Spatial profiles of the fluid volume fraction showed that it is a bubbling type fluidized bed. The simulation results predict fluidization bed is rendered into a non-uniform flow state, and the solid particles are not completely fluidized, led to cement residue at the end of discharging process. The results show that it is reasonable to set discharge outlet diameter to100~120 mm, discharge outlet height to 40~55 mm, fluidized bed slope to 10~15°. The sliding plate slope must be greater than 40°。

Keywords: fluidization performance；gas -particle flow model；bulk cement tank truck；fluent software