Experiment on liquid sheet breakup process of pressure swirl injector

To investigate the liquid sheet breakup length and cone angle of pressure-swirl injectors, 6 ones with different diameters and geometric parameters A are presented. High-speed shadowgraph was used to capture the breakup process. Pressure drop is among 0.1~3 MPa, and injector diameters are among 2.5~6 mm. With pressure drop increasing, breakup length minishes to about 40 mm and cone angle is enlarged to below 60°. with central post diameter increasing, breakup length shortens and cone angle increases. With geometric parameter A increasing, both breakup length and cone angle increase. The experimental results of cone angle are far less than formula when compared with Abromvich and Lefebvre theory, but it has the same trend with theory formula as A ranges from 3~5.