Abstract
The effect of injecting tiny secondary jets (‘∝jets’) on the radiated noise from a subsonic primary jet is studied experimentally. The ∝jets are injected through ports near the nozzle exit with variable port geometry, driving pressure, and yaw angle. A small but clear noise reduction is observed that improves with increasing ∝jet pressure. It is found that smaller diameter ports with higher driving pressure, but involving less thrust and mass fraction, can produce better noise reduction. The present data are compared with data from other investigations on the subject in an attempt to correlate the noise reduction with the operating parameters. The results appear to indicate that the OASPL reduction at a shallow angle correlates with the ratio of the density-velocity-diameter product of the ∝jet to that of the primary jet.
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