NDLI: Aerodynamic and acoustic tests of duct-burning turbofan exhaust nozzles

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Aerodynamic and acoustic tests of duct-burning turbofan exhaust nozzles

Content Provider	NASA Technical Reports Server (NTRS)
Author	Packman, A. B. Kozlowski, H.
Copyright Year	1976
Description	The static aerodynamic and acoustic characteristics of duct-burning turbofan (DBTF) exhaust nozzles are established. Scale models, having a total area equivalent to a 0.127 m diameter convergent nozzle, simulating unsuppressed coannular nozzles and mechanically suppressed nozzles with and without ejectors (hardwall and acoustically treated) were tested in a quiescent environment. The ratio of fan to primary area was varied from 0.75 to 1.2. Far field acoustic data, perceived noise levels, and thrust measurements were obtained for 417 test conditions. Pressure ratios were varied from 1.3 to 4.1 in the fan stream and from 1.53 to 2.5 in the primary stream. Total temperature varied from 395 to 1090 K in both streams. Jet noise reductions relative to synthesized prediction from 8 PNdB (with the unsuppressed coannular nozzle) to 15 PNdB (with a mechanically suppressed configuration) were observed at conditions typical of engines being considered under the Advanced Supersonic Technology program. The inherent suppression characteristic of the unsuppressed coannular nozzle is related to the rapid mixing in the jet wake caused by the velocity profiles associated with the DBTF. Since this can be achieved without a mechanical suppressor, significant reductions in aircraft weight or noise footprint can be realized.
File Size	5768933
Page Count	142
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19770010043
Archival Resource Key	ark:/13960/t56f0n36m
Language	English
Publisher Date	1976-12-01
Access Restriction	Open
Subject Keyword	Aeronautics (general) Ducted Fans Exhaust Nozzles Scale Models Noise Reduction Far Fields Acoustic Propagation Turbofan Engines Divergent Nozzles Aerodynamic Characteristics Turbine Exhaust Nozzles Convergent Nozzles 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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