Comparative Studies of the Supersonic Jet Noise Generated by Rectangular and Axisymmetric Nozzles

Low, Khoon Cheang; Louis, Jean F.; Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics

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Comparative Studies of the Supersonic Jet Noise Generated by Rectangular and Axisymmetric Nozzles

1973-06-01
By Low, Khoon Cheang ; Louis, Jean F.

[PDF-4.20 MB]

English

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Creators:

Low, Khoon Cheang ; Louis, Jean F.

Low, Khoon Cheang ; Louis, Jean F. Less -
Corporate Creators:

Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics
Corporate Contributors:

John A. Volpe National Transportation Systems Center, (U.S.)
Subject/TRT Terms:

[+]

Aerodynamics Aircraft Noise Jet Propelled Aircraft Measurement Noise Sound Level Supersonic Aircraft
Publication/ Report Number:

DOT-TSC-OST-73-22 ; PB-221 855

DOT-TSC-OST-73-22 ; PB-221 855 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Dept. of Transportation. Office of the Secretary
NTL Classification:

NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Energy and Environment;NTL-ENERGY AND ENVIRONMENT-Aviation Energy and Environment;
Abstract:

The main purpose of this study is to develop experimental scaling laws useful for predicting the overall sound power of supersonic jets operating under a range of high stagnation temperatures and pressures and under various exit Mach numbers. A shock tube is used as a flexible tool to provide the range of high stagnation temperatures and pressures associated with the supersonic jets in this investigation. The range of stagnation pressures chosen (for a given temperature and Mach number) correspond to overexpanded, perfectly expanded and underexpanded conditions of the jet. Two different nozzle configurations: a rectangular and an axisymmetric, are examined to determine how a basic difference in shapre of the jet changes the relative importance of the different noise generating mechanisms. Measured sound directivity and Mach waves propagation direction obtsained from shadowgraphs indicate that Mach waves contribute importantly to the noise produced by a rectangular jet.
Format:

PDF
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:1b492901e359ffcee10a1c952999444a7c013962d152faa22aaf25176fc4a050
Download URL:

https://rosap.ntl.bts.gov/view/dot/10531/dot_10531_DS1.pdf
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Comparative Studies of the Supersonic Jet Noise Generated by Rectangular and Axisymmetric Nozzles

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