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The experiment is conducted with a high-speed camera to investigate the breakup processes of liquid jets in uniform, shear-laden, and swirling cross-airflows. The liquid used in the test is water, the nozzle diameter is 2 mm, and the liquid-to-air momentum flux ratio   q   ranges from 5 to 3408.5. The results indicate that liquid jets break up to form small droplets in the uniform cross-airflow. There is an exponential relation between the broken position and   q  . In the shear-laden cross-airflow, the penetration depth of the jet is similar to that of the uniform case, both of which increase with the increase of   q  . When   q   and the mean Weber number are the same as the uniform case, the penetration depth of the jet increases by 25% when the velocity ratio of the upper and lower inlets is   UR  =  5  ; the jet penetration depth decreases by 47.2% when the ratio of   UR  =  0.2   and the jet breaks up quickly and the atomization effect will be better. In the swirling cross-airflow, the jet trajectory is similar to the uniform case and also satisfies the exponential property. When the swirl is weak (swirling numberS    N    =  0.49  ), the jet penetration depth increases compared to the uniform case; when the swirl is strong (    S    N    =  0.82  ), the cross-swirling airflow restrains the jet penetration depth.

Experiment on the Breakup of Liquid Jets in Different Cross-Airflows