空间重力环境对稠密气固两相流动特性影响的数值模拟

NUMERICAL SIMULATION OF DENSE GAS-SOLID TWO-PHASE FLOW CHARACTERS AFFECTED BY SPACE GRAVITY ENVIRONMENTS

文章基于稠密气体分子运动论和颗粒动理学,建立气固流化反应器的稠密气固两相流动的欧拉-欧拉双流体数学模型,考虑了颗粒与颗粒之间离散介质特性,大涡模拟求解气相湍流流动,数值模拟反应器内稠密气固两相流体流动行为,得到了不同重力条件下的颗粒浓度、气相和颗粒相速度等计算结果。结果表明：空间重力环境是影响稠密气固两相流体动力特性的重要因素,颗粒脉动强度将随着重力条件的减小而增大。

An Euler-Euler two fluid model based on the dense gas kinetic theory and the kinetic theory of granular flow of dense gas-solid flow in gas-fluidization reactor was developed.The interactions between particle-particle and gas-particles are considered in the model.Gas turbulent flow is solved by Large Eddy Simulation.Numerical simulations of dense gas-solid two phase flow behaviors were performed.The porosity,velocity of gas and particles under different space gravity environments were obtained.Simulation results show that the space gravity condition exerts great influence on the fluidization characters,the particles fluctuation intensity increases with the decrease of gravity especially.