Liquid Jets Injected Transversely into a Shear Layer

** † An experimental study has been conducted to study the behavior of liquid jets injected into a crossflow containing a shear layer, generated by merging two co-directional air streams of differing velocities. The injection liquid was water, and a nozzle diameter of 0.5 mm was used. Two streamwise locations were available for jet injection, 6.35 cm and 15.24 cm from the location of the merging of the two airstreams. Mie-scattering and Particle Image Velocimetry (PIV) were used to investigate the jet behavior. The structure of the flow containing the shear layer, and the jet penetration and the droplet velocity distribution were studied. The parameters of interest were the ratio of velocity of the two air streams (R), the aerodynamic Weber number (We), the liquid-air momentum ratio (q) and the streamwise location of jet injection (Xi). For R > 1, the jets penetrate further into the crossflow, but spray coverage gets confined to the upper portion of the jet trajectory. For R < 1, the penetration is lesser, but uniform spray coverage was obtained. As the injection location moves further downstream, more mixing occurs between the two airstreams, weakening the shear layer. As a result, the effects of the shear layer on the jet also get dampened.