颗粒群在平面湍射流中输运弥散的大涡模拟

Large Eddy Simulation of Particles Transport and Diffusion with Different Mass Flow Rate in Turbulent Planar Jet Flow

该文针对不同质量流率颗粒群在平面湍射流场中的运动进行了大涡模拟,对颗粒相采用拉格朗日观点的轨道方法进行跟踪。结果显示当流率较小时,颗粒相在漩涡外围聚集较多,流率逐渐增加时,会有颗粒从流动区域逃逸到原先静止的流体区域,以至于在整个射流区域,都相对均匀的分布着颗粒。质量流率对颗粒相在y方向上的平均浓度分布影响相对较小,在流场发展充分时,归一化后不同流率的颗粒平均浓度都呈现类似于高斯分布的形状。

The planer turbulent jet flow has been simulated using large eddy simulation（LES） method,and the particles with different mass flow rate were tracked by a Lagrangian method.The results showed that when the flow rate is small,the particles gather outside of the flow vortex,when the mass flow rate gradually increases,the particles escape from the flow region to the original static fluid region,so that particles are relatively evenly distributed in the jet region.The average concentration of particles in the y direction is effected by the mass flow rate relative little.When the flow field is full developed,the normalized mean particles concentrations at different flow rate showed similar Gaussian distribution.