• TRANSPORT PHENOMENA & FLUID MECHANICS • 上一篇 下一篇
曾卓雄a,b; 周力行a; 祁海鹰c
ZENG Zhuoxionga,b; ZHOU Lixinga; QI Haiyingc
a Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
b Department of Mechanical Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China c Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
摘要: The turbulence enhancement by particle wake effect is studied by large eddy simulation (LES) of turbulent gas flows passing a single particle. The predicted time-averaged and root-mean-square fluctuation velocities behind the particle are in agreement with the Reynolds-averaged Navier-Stokes modeling results and experimental results. A semi-empirical turbulence enhancement model is proposed by the present authors based on the LES results. This model is incorporated into the second-order moment two-phase turbulence model for simulating vertical gas-particle pipe flows and horizontal gas-particle channel flows. The simulation results show that compared with the model not accounting for the particle wake effect, the present model gives simulation results for the gas turbu-lence modulation in much better agreement with the experimental results