Abstract: For simulating gas-particle flows with particle-particle collision,the second-order moment two-phase turbulence model is composed of a particle turbulence model superposed with the kinetic theory of inter-particle collision. Theoretically this is not well justified. Based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluctuation due to particle-particle collision, a two-scale second-order moment two-phase turbulence model accounting for inter-particle collision was developed. The proposed model was used to simulate gas-particle channel flows. The simulation results were in agreement with the experimental results reported in references and were near to the results obtained by using the USM-Θmodel.The large-scale Reynolds stresses were found to be larger than the small-scale Reynolds stresses in each direction.

摘要： 对有颗粒碰撞的两相流动，常常采用将颗粒湍流模型和反映颗粒碰撞作用的动力学模型叠加的方法来构造稠密两相流动的二阶矩湍流模型，在理论上不协调.基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念，建立了两相流动的双尺度二阶矩湍流模型.用该模型对水平槽道内两相流动进行了数值模拟.预报结果和实验结果符合，和单尺度二阶矩湍流模型的结果接近，表明了本模型的可行性.模拟结果还给出了大尺度和小尺度雷诺正应力分布，发现在同一方向上前者比后者大.