湍流边界层中颗粒物扩散的双拉格朗日模拟计算  

Lagrangian-Lagrangian Simulation of Gas-Solid Two-Phase Flow in Turbulent Boundary Layer

作　　者：卓俊[1] 黄流兴[1] 牛胜利[1] 谢红刚[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2016年第3期63-68,共6页Modern Applied Physics

摘　　要：采用拉格朗日方法模拟计算了湍流边界层中气相粒子和颗粒物的运动。其中,气相粒子在流场中按平均风速输送,用一系列随机位移,模拟湍流对扩散的影响,分析了颗粒物在流场中的受力情况,建立了求解颗粒物扩散轨迹的牛顿运动方程。用该方法模拟平板边界层内颗粒物的扩散行为,给出了颗粒物受力及在边界层内的运动轨迹,并将计算的质量通量与文献中的实测值进行了比较。结果表明:计算值与实测值基本吻合,初步验证了本文方法在模拟颗粒物扩散时的可靠性。A Lagrangian-Lagrangian simulation approach of gas-solid two-phase flow in boundary layer with turbulence is presented, and the reliability verification of the approach is also provided in this paper. In the Lagrangian-Lagrangian simulation approach, both gas and solids are simulated in Lagrangian model. The gas is transported under mean wind, mean- while, the influence of turbulence is dealt with a series of random movements of gas. The ve- locities of turbulence sequence in time are simulated by Lagrangian relationship, and veloci- ties of turbulence at different positions are determined by Eular relationship. The particle traces are determined by solving Newtonian equations of motion. The forces such as drag forces, Magnus forces, Basset forces and gravity are considered when particles move in gas flow. The proposed model is applied to simulating a horizontal turbulent boundary layer of air carrying heavy solid particles. The values of forces imposed on particles and the images of particle traces during transportation are obtained. The calculated results of mass flux of par- ticles have been compared with the experimental data, and they are in good agreement.

关 键 词：气固两相流 颗粒物 湍流 扩散 双拉格朗日 

分 类 号：O359[理学—流体力学]