VELOCITY-MEASUREMENTS OF A JET INJECTED INTO A SUPERSONIC CROSS-FLOW

This paper presents a quantitative, experimental study of a single, so nic, underexpanded, transverse, round jet injected into a March 1.6 cr ossflow, This investigation is applicable to studies of supersonic com bustors, thrust vector control of rocket nozzles, the cooling of nozzl e walls, and jet reaction force prediction, Schlieren/shadowgraph phot ography and two-component, frequency preshifted laser Doppler velocime try are used to visualize the flow and to measure three mean velocity components, five of the six kinematic Reynolds stresses, and turbulent kinetic energy at over 4000 locations throughout the flowfield. The s tudy focuses on the transverse, midline plane and on two crossflow pla nes, These measurements are used to study the size and orientation of the recirculation regions upstream and downstream of the jet; the stru cture and strength of the bow shock, barrel shock, and Mach disk; the structure, strength, and development of the kidney-shaped, counter-rot ating vortex pair; the grow th of the annular shear layer between the jet plume and the crossflow; and the growth of the boundary layer bene ath the jet. In addition, the present study provides validation data f or analytical and numerical predictions of the transverse jet flowfiel d.