Experiment on the Breakup of Round Liquid Jets in Shear Cross Airflows

Tian Deng ； Wei Chen ； Shuai Jiang ； Chao-Hua Yuan

《Journal of Aeronautics, Astronautics and Aviation》 51卷3期 Vol.51 No.3 (2019/09) Pp. 309-320

https://doi.org/10.6125/JoAAA.201909_51(3).07

摘要

The experiment is conducted to investigate the breakup processes of liquid jets in uniform and shear-laden cross airflows with the high-speed camera. The liquid used in the test is water and the tapered nozzle diameter is 2mm, and the liquid-to-air momentum flux ratio ranges from 5 to 1917.3. 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 the liquid-to-air momentum flux ratio. In the shear-laden cross airflow, the penetration depth of the jet is similar to that of the uniform cross airflow, both of which increase with the increase of the liquid-to-air momentum flux ratio. When the liquid-to-air momentum flux ratio and the mean Weber number are the same as the uniform cross airflow, 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.

關鍵字

Liquid jets ； Cross airflows ； Break up ； Jet trajectory ； Depth of penetration