Elevated Liquid Jet Injection in Supersonic Crossflow
摘要
In the present work, we study the elevated liquid jet injection strategy into supersonic crossflow and compare its characteristics with that of the conventional flush (wall) injection. A liquid water jet from a 1 mm diameter orifice was elevated from the bottom wall, and liquid was injected into the supersonic crossflow at a Mach number, \(M_{\infty } = 2.5\) . The mean jet/spray penetration height and standard deviation of the penetration height were quantified for both elevated and the flush injection strategy using shadowgraph technique for all experiment cases for momentum flux ratio (J) of 9.7. The jet spray images are acquired using Particle/Droplet Image Analysis (PDIA) technique for both injection strategies at streamwise location of x/D = 60 from the jet exit for J = 9.7 (D = 1 mm). The jet penetration height and the unsteady characteristics of spray plume were measured. The measurements show that there is significant reduction in jet mean penetration height and standard deviation for the elevated jet injection case compared to flush jet injection case. The qualitative differences seen in spray droplet size between the two injection strategies are highlighted.