Abstract
The study of elliptical liquid jets in supersonic flow in a Mach 2.0 is performed numerically. The primary breakup process of the elliptical liquid jet is simulated for a Weber number 223, liquid/gas flux momentum 4.0. The aspect ratios of elliptical geometries are set to be 0.25, 0.5, 1, 2, and 5. The results show a remarkable difference in liquid jet disintegration morphology at different aspect ratios. Under supersonic crossflow conditions, the elliptical liquid jet shows more breakup characteristics than the round liquid jet. As the aspect ratio grows, the penetration depth decreases. The elliptical liquid jet with AR=0.25 has the largest penetration depth in all cases. Moreover, the round jet has a maximum spreading angle of 50.2°. The changing trends of the column breakup length both x direction and y direction are similar. The elliptical jet at a lower aspect ratio has a shorter breakup length due to the narrower windward area. The liquid jet has a pair of larger horseshoe vortex structure and a wider wake region at a higher aspect ratio. Two pairs of reversal vortex pairs with obvious characteristics can be observed in all the simulations.
Highlights
Liquid fuel is directly injected into a supersonic flow in a scramjet engine normally; it must atomize fully and mix well in milliseconds [1,2,3]
Two pairs of reversal vortex pairs with obvious characteristics can be found under all working conditions
The first vortex pair located at the leeward side is relatively higher in height
Summary
Liquid fuel is directly injected into a supersonic flow in a scramjet engine normally; it must atomize fully and mix well in milliseconds [1,2,3]. There are three important physical processes that control atomization characteristics, the deformation of liquid column, the formation of surface waves, and the primary breakup [14,15,16,17]. To study these physical processes, one of the most convenient ways is to change the geometry of liquid orifices. Liquid jet Injection velocity, UL (m/s) Water pressure, PL (kPa) Surface tension coefficient, σ (N/m) This investigation focuses on the breakup processes of the elliptical jet, spatial distribution, and flow field characteristics presented in a supersonic crossflow which has not been fully investigated by previous studies.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
