Adaptive, Overset-Mesh Methodology for the Aeroacoustic Prediction of High-Speed Impinging Jets Using Large-Eddy Simulation

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-10-C-0564
Agency Tracking Number: N102-133-0559
Amount: $80,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2010
Solicitation Year: 2010
Solicitation Topic Code: N102-133
Solicitation Number: 2010.2
Small Business Information
60 Hazelwood Drive, P. O. Box 3001, Champaign, IL, 61826
DUNS: 792045713
HUBZone Owned: Y
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Mark Brandyberry
 Chief Operating Officer
 (217) 766-2567
Business Contact
 William Dick
Title: Chief Executive Officer
Phone: (217) 417-0885
Research Institution
Impinging supersonic jets can generate intense sound through a resonance phenomena, with tones approaching 15 dB beyond the already-loud baseline noise levels. The source of impinging jet noise, including that created by jet blast deflectors, is broadly the interaction between jet and deflecting plane, which can in certain cases close a resonant feedback loop. Accurate prediction of the noise is necessary for understanding the as-yet unknown detailed source mechanism(s), as well as enabling development of mitigation procedures. We seek to apply our validated LES prediction tool in Phase I to two well-documented cases of under-expanded jets impinging on a ground plane: one case resonates while the other does not. Our objective is to use our existing adjoint-based optimization methodology to highlight flow regions most sensitive to design changes or control strategies to reduce radiated noise. As shown in our previous, validated noise reduction efforts for turbulent jets, the adjoint provides a direct investigation into those areas of the flow, such as at the nozzle exit or ground plane, where a noise reduction strategy can be designed. GE Global Research has confirmed their strong interest in this R&D effort, and has agreed to provide critical guidance and review throughout Phase I.

* Information listed above is at the time of submission. *

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