NDLI: Static and wind tunnel near-field/far field jet noise measurements from model scale single-flow baseline and suppressor nozzles. volume 2: forward speed effects

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Static and wind tunnel near-field/far field jet noise measurements from model scale single-flow baseline and suppressor nozzles. volume 2: forward speed effects

Content Provider	NASA Technical Reports Server (NTRS)
Author	Jaeck, C. L.
Copyright Year	1976
Description	A model scale flight effects test was conducted in the 40 by 80 foot wind tunnel to investigate the effect of aircraft forward speed on single flow jet noise characteristics. The models tested included a 15.24 cm baseline round convergent nozzle, a 20-lobe and annular nozzle with and without lined ejector shroud, and a 57-tube nozzle with a lined ejector shroud. Nozzle operating conditions covered jet velocities from 412 to 640 m/s at a total temperature of 844 K. Wind tunnel speeds were varied from near zero to 91.5 m/s. Measurements were analyzed to (1) determine apparent jet noise source location including effects of ambient velocity; (2) verify a technique for extrapolating near field jet noise measurements into the far field; (3) determine flight effects in the near and far field for baseline and suppressor nozzles; and (4) establish the wind tunnel as a means of accurately defining flight effects for model nozzles and full scale engines.
File Size	99388588
Page Count	364
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19770010128
Archival Resource Key	ark:/13960/t9w13vf9b
Language	English
Publisher Date	1976-11-01
Access Restriction	Open
Subject Keyword	Aircraft Propulsion And Power Airspeed Shrouded Nozzles Nozzle Flow Engine Noise Jet Aircraft Noise Scale Models Noise Reduction Annular Nozzles Wind Tunnel Tests Noise Measurement Static Tests 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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