下降管中稠密两相湍流的数值模拟  

SIMULATION OF DENSE GAS-PARTICLE FLOWS IN DOWNER

作　　者：于勇[1] 蔡飞鹏[2] 周力行[1] 时铭显[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]石油大学(北京)化工学院,北京100249

出　　处：《工程热物理学报》2005年第z1期117-120,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究专项经费资助项目子课题(No.G1999-0222-98)

摘　　要：本文将统一二阶矩两相湍流模型和颗粒动力学理论结合,推导并封闭了稠密两相流考虑颗粒间碰撞的统一二阶矩两相湍流模型。该模型用颗粒动力学理论模拟颗粒之间的碰撞,用各向异性的统一二阶矩模型考虑气相和颗粒相的湍流脉动,并用输运方程描述气固两相湍流之间的相互作用。最后用该模型对下降管中的气粒两相流动进行了模拟,模拟所得的沿径向颗粒浓度分布和速度分布与实验吻合较好,预报结果也反应出了颗粒雷诺应力的各向异性。A second-order moment two-phase turbulence model for dense gas-particle flows (USM-θ) model), combining the unified second-order moment two-phase turbulence model for dilute gas-particle flows with the kinetic theory of particle collision, is proposed. The interaction between gas and particle turbulence is simulated using the transport equation of two-phase velocity correlation with a two-time-scale dissipation closure. The proposed model is applied to simulate dense gas-particle flows in a downer. Simulation results and their comparison with the experimental results show good agreement for particle volume fraction and axial velocity distribution. The model is also better than the κ-ε-κp-θ model and the κ-ε-κp-εp-θ model in that the first model can simulate the anisotropic particle Reynolds stress components.

关 键 词：二阶矩 稠密两相流 湍流模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]