Velocity measurements for a sonic underexpanded transverse jet injected into a supersonic flow

Transverse jet injection into a supersonic flow (TJISF) is a promising method of achieving the injection, mixing, and combustion of fuel in new supersonic combustion engines. The present investigation uses measurements of the mean and fluctuating components of the TJISF velocity field to study fluid dynamic mechanisms and mixing processes. The study provides velocity measurements using a two-component, frequency pre-shifted LDV system together with an automatic traverse system. Over 2,200 measurement locations are concentrated in the transverse, midline plane. These measurements help resolve issues such as the size and orientation of the recirculation regions upstream and downstream of the jet, the velocity of the jet in the barrel shock structure, the Mach number immediately preceding the Mach disk, the Reynolds stresses of the mixing layers, and the overall structure of the mean flow and turbulence fields.