NDLI: Experimental investigation of shock-cell noise reduction for single stream nozzles in simulated flight

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Experimental investigation of shock-cell noise reduction for single stream nozzles in simulated flight

Content Provider	NASA Technical Reports Server (NTRS)
Author	Knott, P. R. Yamamoto, K. Janardan, B. A. Brausch, J. F. Balsa, T. F.
Copyright Year	1984
Description	Seven single stream model nozzles were tested in the Anechoic Free-Jet Acoustic Test Facility to evaluate the effectiveness of convergent divergent (C-D) flowpaths in the reduction of shock-cell noise under both static and mulated flight conditions. The test nozzles included a baseline convergent circular nozzle, a C-D circular nozzle, a convergent annular plug nozzle, a C-D annular plug nozzle, a convergent multi-element suppressor plug nozzle, and a C-D multi-element suppressor plug nozzle. Diagnostic flow visualization with a shadowgraph and aerodynamic plume measurements with a laser velocimeter were performed with the test nozzles. A theory of shock-cell noise for annular plug nozzles with shock-cells in the vicinity of the plug was developed. The benefit of these C-D nozzles was observed over a broad range of pressure ratiosin the vicinity of their design conditions. At the C-D design condition, the C-D annual nozzle was found to be free of shock-cells on the plug.
File Size	16761578
Page Count	397
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850005241
Archival Resource Key	ark:/13960/t7cs0nt2n
Language	English
Publisher Date	1984-12-01
Access Restriction	Open
Subject Keyword	Acoustics Plug Nozzles Laser Doppler Velocimeters Jet Aircraft Noise Noise Reduction Convergent-divergent Nozzles Plumes Convergent Nozzles Anechoic Chambers Nozzle Design Nozzle Flow Annular Nozzles Flow Visualization Shadowgraph Photography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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