LES-SOM双流体模型数值模拟提升管内气固流动

Study on Gas-Solid Two-Phase Flow Using LES-SOM Model in Riser

采用亚格子湍动能方程,结合大涡模拟方法(Large eddy simulation,LES)模拟提升管气相湍流流动,颗粒矩(Second Order Moments,SOM)模型模拟提升管内颗粒湍流流动,建立大涡模拟颗粒矩(LES-SOM)双流体模型。数值模拟提升管内气固两相流动与燃烧反应过程,得到了提升管内颗粒浓度和速度以及不同气体组分的空间分布规律。分析了Smagorinsky亚格子应力模型对颗粒相浓度和速度的影响,以及对煤颗粒在提升管内燃烧特性的影响。数值模拟颗粒浓度和速度分布与他人实验结果相吻合。

A large eddy simulation for gas phase turbulence combing with second-order moment （SOM） model for solid phase（LES-SOM） is proposed to simulate the flow and reaction behavior of gas and particles in the riser.The gas turbulent kinetic energy equation is used to predict gas turbulent viscosity as a function of sub-grid scale turbulent kinetic energy.Distributions of volume fraction, velocity,and gas species concentration are obtained from numerical simulations.The influence of different Smagorinsky＇s model constant on hydrodynamics and chemical reactions are analyzed in tin- riser.Simulated solids volume fraction and velocity are in agreement with experimental data published in literature.