Investigation of mixing characteristics and flow physics induced by spanwise tandem injection in supersonic crossflow

This study examines the interaction of two spanwise, transversally injected jets with a supersonic crossflow using experimental and numerical methods. The results reveal that smaller jet spacings suppress crossflow entrainment into the inter-jet region and intensify the interaction between the upstream bow shocks generated by each jet, resulting in larger pressure jumps in the passage between the jets. Conversely, larger jet spacings promote greater crossflow entrainment and enhance mixing efficiency, driven by more pronounced vortex interactions between the jets. Computational fluid dynamics (CFD) simulations also reveal shear layer unsteadiness, which induces shock oscillations.