Abstract
A stereoscopic particle image velocimeter has been implemented in a production-scale transonic wind tunnel for studying jet/fin interaction created by exhaust plumes from spin rockets on a full-scale model of a finned body of revolution. Data were acquired principally at a measurement plane just upstream of the leading edge of the fin root, which clearly display the counter-rotating vortex pair as well as a smaller vortex pair near the surface believed to be the remnant of the horseshoe vortex. The counter-rotating vortex pair is distinctly asymmetric as a result of having been produced by a jet exiting from a scarfed nozzle and displays some twist with respect to the model surface. The horseshoe vortex is displaced laterally from the nozzle position. Velocities measured over a range of flowfield conditions and model orientations show that the size and position of the vortices chiefly scale with the jet-to-freestream dynamic pressure ratio and that their strength is additionally a function of the crossflow Mach number.
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