鼓泡流化床内稠密气固两相流大涡数值模拟

Large Eddy Approach and Numerical Simulation of Dense Gas-solid Two-phase Flow in Bubling Fluid-bed

大涡数值模拟方法在单相流中已有较成熟的应用,在气固两相流应用中的模拟结果更接近实验结果。建立稠密气固两相流双流体大涡数值模拟(LESg-θ-LESp)模型,研究鼓泡流化床内气固两相流动特性,模拟观察到鼓泡流化床中气泡的长大、合并和破碎的运动过程。模拟结果得到了床内颗粒相时,均可解尺度速度和脉动速度等分布,与Yuu等实测结果相吻合;床内颗粒相时,均浓度分布,与Taghipour等实测结果相吻合。

With the development of computer technology and computational method,numerical simulation has become one of the most promising methods for studying gas-solid flows.The filerted conseveration equations for gas phase and solid phase are derived,and Euler-Euler two-fluid large eddy simulation of dense gas-solid flows LESg-θ-LESp is presented. The simulated time-averaged particle velocity and fluctuating velocity of particles are agrrement with Yuu et al.experimental data.The predicted concentration of particles agrees with Taghipour et al experimental results.