Numerical and Physical Modeling of the Response of Resonator Liners to Intense Sound and High Speed Grazing Flow

Award Information
Agency:
National Aeronautics and Space Administration
Branch:
N/A
Amount:
$599,808.00
Award Year:
2010
Program:
SBIR
Phase:
Phase II
Contract:
NNX10CB30C
Agency Tracking Number:
084152
Solicitation Year:
2008
Solicitation Topic Code:
A2.03
Solicitation Number:
N/A
Small Business Information
Hersh Acoustical Engineering, Inc.
22305 Cairnloch Street, Calabasas, CA, 91302-5875
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
Y
Duns:
059784298
Principal Investigator
 Alan Hersh
 Principal Investigator
 (818) 224-4699
 haeash@charter.net
Business Contact
 Alan Hersh
Title: Vice President
Phone: (818) 224-4699
Email: haeash@charter.net
Research Institution
N/A
Abstract
An aeroacoustic computational code based upon a numerical solution of the full Navier-Stokes equations will be developed to provide a deep understanding of the physical behavior of resonator liners exposed to intense sound and boundary-layer grazing flow. The code computes the entire flow and acoustic field inside the flow duct. The user has the option to choose the flow Mach number, boundary-layer thickness, duct mode of incoming sound, frequency and SPL. For broadband sound, the user has the option to specify an incident noise spectrum. The code is designed to operate at both standard temperatures and very high temperatures. A semi-empirical three-dimensional resonator liner impedance code will developed for resonators also exposed to intense sound and boundary-layer grazing flow. The liner empirical parameters will be calibrated with NASA furnished resonator test data. Because of its simplicity, it can be used to provide realistic liner geometries for sound propagation codes that are used in both NASA and industry to determine optimum wall impedances to control excessive sound generated in jet engines and other flow duct environments.

* information listed above is at the time of submission.

Agency Micro-sites

US Flag An Official Website of the United States Government