超音速拟序旋涡中颗粒的弥散

Dispersion of Particles in the Supersonic Coherent Vortex

应用大涡模拟方法耦合质点颗粒拉格朗日轨道模型,研究空间发展超音速拟序旋涡中颗粒的弥散特性。结果表明,存在特定尺度颗粒其弥散能力最强。颗粒倾向性聚集于流动特征时间尺度长的低速流动区域,小尺度与中尺度颗粒的倾向性分布表征为大量颗粒存在于旋涡边缘的低涡量区以及旋涡与旋涡之间的大变形薄层区。随着颗粒尺度的减小,颗粒加速能力以及与气体旋涡的掺混增强。

The dispersion characteristic of particles in the spatial development supersonic coherent vortex was investigated by large eddy simulation coupled with the point-particle Lagrangian trajectory model. The results showed that particles with a specific scale had the strongest dispersion ability. Particles preferentially accumulated in the low speed region with longer characteristic time scale of the flow. The preferential concentration of small- and medium-size particles was represented by the distribution of a large number of particles in the edge of vortex with low vorticity and the large deformation thin layer between vortexes. With the decrease of the particle size, the acceleration ability of particles and the mixing with gas vortexes were both enhanced.