基于双欧拉模型的流化床气固两相流场数值模拟

Numerical simulation of gas and solid two-phase field on the fluidized bed based on double Euler model

为解决低流化风速下采用Syamlal-O’Brien曳力模型计算流化床内流化过程误差较大的问题,选择曳力模型预测初始最小流化条件,结合实验数据,修正Syamlal-O’Brien曳力模型,并采用双欧拉模型对均匀床内低速气固两相流场进行数值计算.结果表明:修正Syamlal-O’Brien曳力模型计算结果略小于实验结果,最大相对误差为4.4%,但轴向压降变化趋势相同,能够满足工程实际要求,可以描述低速气固两相流动相互作用物理过程.

Under the low fluidized air speed,if we use the Syamlal-O and Brien drag model,the error is very big.It is very important for formulating the reasonable resistance law to forecast the initial minimal fluidized condition.Bonding the experiment data,amending Syamlal-O and Brien drag model and adopting double Euler model to compute the gas-solid two-phase flow field with low speed in the fluidized bed.Research shows,adopting the amending Syamlal-O and Brien model to compute resistance between the two phases,it can describe the interaction physical process of the low speed between gas and solid two-phase flow field.The numerical computing results are in harmony with the experiment data preferably.