混合层中粒子扩散的实验研究

本文应用流动显示和LDA测量,对混合层中粒子的扩散问题进行了实验研究。结果表明：粒子的扩散强烈地依赖于St数,具有较小St的粒子的扩散近似地与流体示踪粒子相同,随着St的增大,扩散角度增大,也就是说粒子扩散加快,并且随着粒子惯性的增大,它对湍流脉动的响应将会减弱。

An Experimental Research on the Dispersion of Particles in Mixing Layer

The dispersion of particles in a mixing layer is investigated by Laser Dopper Anemometer(LDA) and flow visualization. Experimental data are analyzed. The results indicate that the dispersion of particles strongly depends on the Stokes number. It is found that the particles with smaller Stokes number move along the streamline of eddy structures, and the degree of particle dispersion increases with the increasing of Stokes number, and the influence of particles on the fluctuation of flow field is weakened with the increasing of inertia.