鼓泡流化床内稠密气固两相流大涡数值模拟

摘要

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.