横流中空心锥形喷雾的扩散特性与影响因素

The influences of different factors on droplet dispersion of the hollow cone spray transversely injected into the crossflow are systematically investigated based on the experimental measurements. The research findings show that as the crossflow velocity increases, the Counter-rotating Vortex Pair (CVP) decreases in size with its stability first increasing and then decreasing. With the increase of Reynolds number and number flow rate of the spray droplets, the depth of the shear layer and the length of the spray wake structures as well as the droplet CVP vorticity increase. The quantitative correlations between the feature sizes of the droplet CVP and the trajectory of the droplet shear layer structure are developed based on the experimental data in terms of the relevant parameters. Furthermore, it is found that as the spray angle decreases, the CVP decreases in width, increases in height, and becomes more stable, and the depth of the spray penetration increases. Compared with the case of vertical injection of the spray, when the spray is injected obliquely against the crossflow, the shear layer vortex becomes larger and the spray wake structures more irregular; the stability of the CVP induced and droplet preferential accumulation on the shear layer are weakened; otherwise, the CVP and the shear layer vortices as well as the wake structures will become smaller.