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首页> 外文期刊>Chinese science bulletin >Transitional phenomenon of particle dispersion in gas-solid two-phase flows
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Transitional phenomenon of particle dispersion in gas-solid two-phase flows

机译：气固两相流中颗粒分散的过渡现象

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Without using any turbulent model, direct numerical simulation of a three-dimensional gas-solid two-phase turbulent jet was performed by finite volume method. The effects on dispersion of particles with different Stokes numbers by the transitional behavior of turbulent structures were investigated. To produce high-resolution results and reduce the computation and storage, the fractional-step projection algorithm was used to solve the governing equations of gas phase fluid. The low-storage, three-order Runge-Kutta scheme was used for time integration. The governing equations of particles were solved in the Lagrangian framework. These numerical schemes were validated by the good agreement between the statistical results of flow field and the related experimental data. In the study of particle dispersion, it was found that the effects on particle dispersion by the spanwise vortex structures were prominent. The new behaviors of particle dispersion were also observed during the evolution of the flow field, i.e. the transitional phenomenon of particle dispersion occurs for the particles with small and intermediate Stokes numbers.
机译：在不使用任何湍流模型的情况下，通过有限体积法对三维气固两相湍流射流进行了直接数值模拟。研究了湍流结构的过渡行为对不同斯托克斯数的颗粒的分散性的影响。为了产生高分辨率结果并减少计算量和存储量，使用分数步投影算法来求解气相流体的控制方程。低存储的三阶Runge-Kutta方案用于时间积分。在拉格朗日框架中求解了粒子的控制方程。这些数值方案通过流场的统计结果与相关实验数据之间的良好一致性而得到验证。在颗粒分散研究中，发现翼展方向涡旋结构对颗粒分散的影响是显着的。在流场的演变过程中还观察到了颗粒分散的新行为，即，对于斯托克斯数较小和中等的颗粒，发生了颗粒分散的过渡现象。

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