二维气固混合层中拟序结构对固粒运动影响的研究＊

本文对固粒在混合层涡卷起和配对过程中的运动进行了研究。对流场用拟谱方法直接数值模拟，对固粒用颗粒－轨道模型。计算结果给出了涡卷起和涡配对过程中固粒的运动情况，说明本流场Ｂａｓｓｅｔ力对固粒运动的影响甚微；拟序结构演变过程的不同阶段造成不同的固粒分布，该结果与流场显示的实验结果相符；在相同流场条件下，Ｓｔｏｋｅｓ数是影响固粒在拟序结构流场中运动的控制参数。文中所得结论对工程应用具有指导意义。

Research on the Effect ofthe Coherent Structure on the ParticleMotion in a Two-dimensional Gas-solid Mixing Layer

In this paper,the particle dispersion in a shear layer which undergoes the vortex rolling up and the vortex pairing is investigated.The pseudo spectral method is employed to simulate the flow.Particles are traced with the Lagrangian method.It is found that the Basset term in the particle equation has a little contribution to the motion of particles.Particles have different dispersion patterns in the different stages of the coherent vortex evolution,which correspond to the experimental result.For the same flows with coherent structure existence,the dispersion pattern of the particle dispersion depend on the Stokes number.All of results given in the paper are helpful to the pracitcal usage.