Numerical simulation of ellipse liquid jet atomization in supersonic crossflow

In the combustion chamber of the scramjet, liquid fuel enters the supersonic crossflow in the form of liquid jet in crossflow (LJIC), and the jet interacts with the crossflow to complete atomization. As the initial stage of the combustion process, fuel atomization has a significant impact on the scramjet combustion efficiency and stability. Investigating the atomization and vortex characteristics of liquid fuel jet in supersonic crossflow is of great significance for scramjet design.The Coupled Level-Set and Volume of Fluid (CLSVOF), large eddy simulation (LES), and adaptive mesh refinement (AMR) were simultaneously used in this article to simulate ellipse jet in supersonic crossflow. The atomization characteristics of liquid jets with ellipse nozzles with different aspect ratios (AR) in supersonic crossflow at Ma = 2.85 were explored. It is found that ellipse jets with small AR have strong anti-deflection ability, large penetration, large spanwise range, dense surface waves, stiff bow shock waves, small recirculation zone, and sparse vortex distribution. Ellipse jets with large AR have easy deflection, small penetration, small spanwise range, sparse surface waves, curved bow shock waves, large reflux area, and dense vortex density. CaseAR0.25 has the highest penetration, 42.8% greater than caseAR4, as well as the largest spanwise range, 45.1% bigger than caseAR4. Among all cases, caseAR0.25 has the maximum number of surface waves (8), while caseAR4 has the minimum (3). These findings have guiding significance for the enhancement of the atomization of jet in supersonic crossflow.