Turbulence Framework for Jet Noise Prediction and Reduction

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NAS3-02157
Agency Tracking Number: 001377
Amount: $599,943.00
Phase: Phase II
Program: SBIR
Awards Year: 2003
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Combustion Research and Flow Technology,
174 North Main Street, P.O. Box 1150, Dublin, PA, 18917
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Donald C. Kenzakowski,
 Senior Research Scientist
 (215) 249-9780
 kenzakow@craft-tech.com
Business Contact
 Sanford Dash
Title: President & Chief Scientist
Phone: (215) 249-9780
Email: dash@craft-tech.com
Research Institution
N/A
Abstract
The innovation proposed is the construction of a unified nonlinear turbulence model for use in jet noise studies that will operate in an invariant manner (fixed coefficients/correction terms), and will provide reliable mean flow and anisotropic stresses predictions for a broad range of jet conditions. Model construction will be based on extensions to an operational explicit algebraic stress model (EASM) framework that includes anisotropic dissipation, compressibility, and vortex-stretching extensions, and is supplemented by additional scalar fluctuation and dissipation rate equations used to locally evaluate turbulent Prandtl and Schmidt numbers. CRAFT Tech will be supported by Seiner and coworkers at U. Miss who will obtain 3D PIV data for Mach .85 and 1.5 cold and hot jets to support model calibration. Acoustics data will also be obtained in this effort, and simulations performed via coupling the CFD solution with an acoustics analogy noise code (such as MGB) will be compared with this data. In Phase II, the model will be extended to more complex 3D propulsive jets that include varied mixing enhancement devices. In addition, propulsive interfacing and aerodynamic interactions will be addressed.

* information listed above is at the time of submission.

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