Abstract
The study of supersonic twin impinging jets is of significant interest to scientists and engineers for the fundamental understanding of flow physics and its applications. The present experimental investigation examines flow and acoustics characteristics of Mach 1.5 twin impinging jets as a function of internozzle spacing. The global flowfield was visualized using the shadowgraph technique, and mean pressures in the jet impingement and fountain region were measured using a pressure scanner. In addition, near-field acoustic measurements were performed in two different directions relative to the nozzle exit, and the velocity field was measured using planar particle image velocimetry. The results indicate that changing the internozzle spacing alters the fountain-flow strength, while the jet impingement characteristics remain relatively unchanged. The broadband and discrete high-amplitude tones are a function of nozzle spacing and show unique directivity. The velocity distributions agree well with the acoustic measurements and are a strong function of nozzle spacing.
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