摘要
在考虑稠密气固两相流中颗粒具有非均匀流动特性的情况下,提出了基于颗粒团聚效应的气固相间曳力模型,数值模拟循环流化床提升管内气固两相的流动特性。模拟计算时考虑气固相间的作用力,壁面处气相采用无滑移边界条件,固相采用考虑颗粒与壁面的碰撞和颗粒与壁面的简单摩擦作用的壁面边界条件。结果表明,考虑颗粒团聚效应的曳力模型能很好地反映提升管内气固两相流动特性,模拟结果比应用Gidaspow曳力模型的计算结果更接近文献[16]的试验结果。
Considering the uneven flow characteristics of particles in dense gas-solid two-phase flow, the gas-solid interphase drag force model was formulated on the basis of particle aggregation effect. And the gas-solid two-phase flow characteristics in the riser of the numerically simulated circulating fluidized bed were also described. The simulation calculation considered the gas-solid interphase force. The gas phase adopted the no-slip boundary condition. The solid phase adopted the wall surface condition of particle colliding with wall surface and particle's simple friction with wall surface. The result shows that the drag force model which takes into account the aggregation effect can well reflect the gas-solid two-phase flow characteristics in the riser. The simulation result is closer to the experimental result of Knowlton, compared with the calculation result which applies the Gidaspow drag force model.
出处
《石油机械》
北大核心
2011年第10期32-38,196,共7页
China Petroleum Machinery
关键词
循环流化床
提升管
曳力模型
颗粒团聚效应
稠密气固两相流
circulating fluidized bed, riser, drag force model, particle aggregation effect, dense gas-solid two-phase flow
