NDLI: The influence of a crossflow on jet noise

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The influence of a crossflow on jet noise

Content Provider	NASA Technical Reports Server (NTRS)
Author	Cole II, J. E.
Copyright Year	1972
Description	The acoustic field generated by a circular jet in the presence of a low speed crossflow is calculated. The solution is obtained for a quadrupole source located in a uniformly moving acoustic medium. Ribner's work on straight jets is used to model the flow in the turbulent crossflow jet. The movement of the acoustic medium results in the acoustic intensity being greater upstream of the jet flow than at an equal distance downstream. A summary is also presented of the analysis for the acoustic intensity of a crossflow jet which is in motion through a stationary acoustic medium. The analysis is applicable to the noise generated by the lift jet of a V/STOL aircraft under take-off or landing conditions. The results of these two configurations provide a comparision of the directional distribution of acoustic intensity measured in a wind tunnel test of a crossflow jet and in a corresponding flight test.
File Size	2960245
Page Count	51
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730003309
Archival Resource Key	ark:/13960/t9r25q79v
Language	English
Publisher Date	1972-11-01
Access Restriction	Open
Subject Keyword	Aircraft Flight Tests Turbulent Flow Acoustic Measurement V/stol Aircraft Jet Aircraft Noise Lift Fans Wind Tunnel Models Cross Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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