流化床反应器内气固两相流动特性的研究

Investigation of the Gas-solid Two-phase Flow Characteristics Inside a Fluidized Bed Reactor

基于颗粒动力学理论模拟颗粒相流动,应用流体与颗粒两相流理论考虑两相相间作用,建立了流化床核反应器内多相流流动的计算流体动力学模型,数值模拟研究了流化床核反应器内的流体动力行为。计算结果表明,应用Gi-daspow曳力模型得到的沿截面颗粒浓度分布与已有实验结果的分布趋势比较接近。在中心喷射区的中心处颗粒浓度较高。随着径向距离的增大,逐渐降低到局部最小值后颗粒浓度逐渐上升。在环隙区域内颗粒浓度基本保持不变。分析了流体与颗粒间作用力、颗粒弹性恢复系数等对流化床核反应器内流体动力特性的影响。研究表明,颗粒碰撞恢复系数越大,流场内沿截面颗粒浓度分布变得越均匀。

By simulating the particle phase flow based on the particle kinetic theory and taking into account the two phase interaction by using the fluid and particle two phase flow theory,established was a CFD(computational fluid dynamics) model featuring the multiple phase flow inside a fluidized bed nuclear reactor,and numerically simulated and studied were the fluid kinetic behaviors in the above-mentioned reactor.The calculation results show that the distribution of particle concentrations on the cross section o...