Interaction of Gas and Particles in Turbulent Flow

对水平管内湍流气流与粗颗粒的相互作用进行了数值模拟和实验研究。实验中采用激光多普勒测速仪（LDV）测量了颗粒平均直径为1.6mm、密度为1024 kg/m^3、管径为79.8mm、长度为7.5m的管道中的颗粒速度、气体速度和气体轴向湍流脉动。在计算中，提出了一个气体和粗颗粒之间的湍流相互作用模型，使用k-ε模型计算气固两相流。一个双向耦合计算进行，基于拉格朗日方法的颗粒和欧拉方法的气体。此外，还考虑了颗粒之间、颗粒与管壁之间的碰撞以及颗粒的旋转。控制方程数值求解得到颗粒速度，浓度，压力损失，气体速度和湍流强度，这是比较与LDV测量的结果，以及公布的数据，这些测量是很好的预测本模型。

Interaction between turbulent gas flow and coarse particles in horizontal pipes are examined numerically and experimentally. In the experiment, particle velocity, gas velocity and axial turbulent fluctuation of gas are measured by using LDV,where the particle mean diameter and the density are 1.6mm and 1024kg/m^3, respectively, and the pipe diameter and the length are 79.8mm and 7.5m, respectively. In the calculation, a turbulent interaction model between gas and coarse particles is proposed to calculate the gas-particle flow using the k-epsilon model. A two-way coupling calculation is carried out, based on the Lagrangian approach for the particles and the Eulerian approach for the gas. Furthermore, collision between particles and between particle and pipe wall, and rotation of particle are also considered. Governing equations are solved numerically to give particle velocity, concentration, pressure loss, gas velocity and turbulent intensity, which are compared with the results of LDV measurements as well as published data, and those measurements are well predicted by the present model.