Crossflow vortices of a jet injected into a supersonic crossflow

Numerous investigations of the fluid mechanics of the transverse jet injected into a supersonic flow (TJISF) flowfield have been motivated by the study of supersonic combustor fuel injection, thrust vector control of rocket nozzles, and jet reaction force prediction. Early studies presented detailed qualitative discussions of the structure of the TJISF flowfield. A few studies have provided either quantitative or semiquantitative measurements of the velocity fields of underexpanded jets injected into a supersonic flow. Despite these investigations, there is a dearth of nonintrusive, quantitative mean velocity and turbulence measurements in the TJISF flowfield. This note uses laser Doppler velocimetry (LDV) measurements of the mean velocity fields to study development of the crossflow vortices of a sonic, underexpanded transverse jet injected into a Mach 1.6 crossflow.