| 内容提要: |
To investigate the dynamics of droplet-vortex interactions in wake flow, two independent scaling parameters, Stokes number StL and
particle-fluid mass loading ratio f were acquired by the particle-laden momentum equation. The simulations were carried out by using Euler-Lagrange approach, which was validated by the available experiments and numerical results. Then, the particle response and particle dispersion pattern in wake flow, the lift coefficient and Strouhal
number were analyzed to evaluate the particle-vortex interactions. The results indicated that, firstly, StL and f, which constitute a dominant scaling group, can characterize the dynamics of droplet-vortex interaction in wake flow. When StL increases, particles gradually
separate from the vortex due to the centrifugal effect. The parameter f further disperses the particle distribution for its momentum exchange with irregular vortex structures. Secondly, the lift coefficient decreases with StL and increases with f, which can be explained by the movement of the separation point caused by the laden of particles. Lastly, Strouhal number decreases with StL and f. The analysis based on the oscillating fishtail model revealed that length of the formation
region and the width of the shear layer diffuse are the two simultaneous characteristic lengths, which gives a physical basis for the determination of the frequency. |