Investigation of the Liquid Sheet Breakup Dynamics in Like-On-Unlike Impinging Injectors

Propagation mechanics of the liquid sheet formed by the impingement of a like-on-unlike impinging injector is investigated experimentally. The liquid sheet formation and breakup dynamics are captured using the backlight imaging technique. Characteristics of the instability waves on the sheet surface and the ligament shedding are quantified using proper orthogonal decomposition technique and frequency spectra analysis. Propagation of impact waves and Kelvin–Helmholtz instability waves is identified, and related frequencies are correlated with the ligament/droplet shedding frequencies.