NDLI: A forward speed effects study on jet noise from several suppressor nozzles in the nasa/ames 40- by 80-foot wind tunnel

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A forward speed effects study on jet noise from several suppressor nozzles in the nasa/ames 40- by 80-foot wind tunnel

Content Provider	NASA Technical Reports Server (NTRS)
Author	Beulke, M. R. McCann, E. O. Morozumi, H. M. Clapper, W. S.
Copyright Year	1974
Description	A test program was conducted in a 40 by 80 foot wind tunnel to evaluate the effect of relative velocity on the jet noise signature of a conical ejector, auxiliary inlet ejector, 32 spokes and 104 tube nozzle with and without an acoustically treated shroud. The freestream velocities in the wind tunnel were varied from 0 to 103.6 m/sec (300 ft/sec) for exhaust jet velocities of 259.1 m/sec (850 ft/sec) to 609.6 m/sec (2000 ft/sec). Reverberation corrections for the wind tunnel were developed and the procedure is explained. In conjunction with wind tunnel testing the nozzles were also evaluated on an outdoor test stand. The wind tunnel microphone arrays were duplicated during the outdoor testing. The data were then extrapolated for comparisons with data measured using a microphone array placed on a 30.5 meter (100 ft) arc. Using these data as a basis, farfield to nearfield arguments are presented with regards to the data measured in the wind tunnel. Finally, comparisons are presented between predictions made using existing methods and the measured data.
File Size	14322606
Page Count	263
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740013785
Archival Resource Key	ark:/13960/t94795c67
Language	English
Publisher Date	1974-05-03
Access Restriction	Open
Subject Keyword	Noise Propagation Air Flow Acoustic Measurement Acoustic Properties Nozzle Flow Jet Flow Noise Intensity Ejectors Flow Distribution Wind Tunnel Tests Aerodynamic Noise 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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