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NEW FLIP-FLOP JET NOZZLE WITHOUT CONTROL PORT AND FEEDBACK LOOP

J. Mi
Department of Mechanical Engineering, University of Adelaide, SA 5005, Australia

G. J. Nathan
Department of Mechanical Engineering, University of Adelaide, SA 5005, Australia

Abstract

This paper reports experimental results of the mixing characteristics of a low-frequency flapping, slightly heated, jet from a self-exciting fluidic nozzle. The fluidic device used for the investigation contains no external feedback loop and no external trigger (Figure 1). Temperature measurements were carried out in both the flapping jet and a non-flapping free jet using a cold-wire probe. It is shown that the flapping jet from the nozzle mixes the ambient fluid at a higher rate than does the non-flapping free jet. The present study also suggests that the Strouhal number of the flapping have a significant impact on the jet mixing. A better performance in mixing is found at high Strouhal numbers.