Effect of Nozzle-Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet
نویسندگان
چکیده
This study investigates the effect of nozzle-plate distance on the acoustic phenomena from a correctly expanded supersonic jet impinging on an inclined flat plate. In the authors’ previous study, the overall sound-pressure-level (OASPL) in the direction almost perpendicular to the plate from the impingement region became highest when the nozzle-plate distance was 15D (D, the nozzle exit diameter), although its mechanism was not clarified. In this study, the results of the sound-pressure-level measurement, conditional sampling analysis, and ray tracing of the acoustic intensity vectors are combined to discuss the phenomenon above more in detail. The result shows that the OASPL increase in the 15D case is mainly due to the Mach wave, which is generated from the free-jet region and reflects on the flat plate on the bottom side of the jet.
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