Acoustics and fluid dynamics studies of high speed jet noise reduction devices

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Acoustics and fluid dynamics studies of high speed jet noise reduction devices

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices ciencein:Aerospace EngineeringIt is entitled:Acoustics and Fluid Dynamics Studies of High Speed Jet Noise Reduction DevicesThis work and its defense a

pproved by:Chair: Dr- Ephraim J. GutmarkDr. Paul D. OrkwisDr. Steven MartensDr. John p WojnoAbstractJet noise reduction was investigated on a scale mo Acoustics and fluid dynamics studies of high speed jet noise reduction devices

del turbofan exhaust simulator rig at a Reynold’s Number 0(1 o' ) through mean and time-resolved flow and aeroacoustic measurements. Various stream-wi

Acoustics and fluid dynamics studies of high speed jet noise reduction devices

se vorticity production devices, including conventional and modified chevron nozzles and CVG’s (Coupled Vortex Generators), were installed to increase

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices el aid to elucidate the initial vortex development for several geometries. CVG’s were installed in axisymmctric arrangements on both the core and fan

streams of the exhaust simulator, and in the various boundary layers. Measurements of the nozzle boundary layer characteristics were performed using a Acoustics and fluid dynamics studies of high speed jet noise reduction devices

total pressure probe on the baseline hardware to determine appropriate mean spatial scales, and to evaluate the boundary layer momentum thickness inf

Acoustics and fluid dynamics studies of high speed jet noise reduction devices

luence on noise for a coaxial, turbulent jet. LDV of two velocity components determined the turbulence properties in the jet at various locations in t

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices th added high-frequency energy. One purpose was to offer an explanation of this ‘self noise component and mixing mechanisms, in comparison w ith delta

tabs which also incur high-frequency noise. With properly scaled geometry design, and installation configurations, the CVG’s can achieve SPLpeak nois Acoustics and fluid dynamics studies of high speed jet noise reduction devices

e reductions for essentially all directivity angles, with the addition of a high-frequency source that appears consistent with a self-noise induced di

Acoustics and fluid dynamics studies of high speed jet noise reduction devices

pole.2Acknowledgements1 would like to thank those who supported this work, and the great amount of work that never will be represented throughout my l

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices idance. Also, he provided a worldclass environment with which to pursue this research effort.Dr. John Wojno at GE Aviation was my technical research s

upervisor and lead to whom I owe many valuable open conversations about jet noise and acoustics, and from paying close attention 1 received a great de Acoustics and fluid dynamics studies of high speed jet noise reduction devices

al in return. I appreciate his w illingness to let me take as much of a role in the technology development process as I could handle.Dr. Steve Martens

Acoustics and fluid dynamics studies of high speed jet noise reduction devices

, now of GE GRC, 1 owe sincere thanks to for building a great collaboration with uc. Sharing his particularly insightful oversight of our methods and

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices .Dr. Richard Cedar, besides offering his own valuable experience and insight in engine technology development, brought the driving force to make these

experiments as practical as possible while pursuing a basic level of fundamental understanding. I am glad to have been exposed to his perspective.To Acoustics and fluid dynamics studies of high speed jet noise reduction devices

Russ Dimicco 1 owe a great deal for oversight of the facility and equipment, and his tenacious distaste for substandard anything. The quality of data,

Acoustics and fluid dynamics studies of high speed jet noise reduction devices

and the resources to get things done was by his doing.To my colleagues Olaf Rask, Dave Munday, and Seth Harrison, I owe many sets of data, completed

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc

Acoustics and fluid dynamics studies of high speed jet noise reduction devices ussing ideas in fluids and acoustics. I owe a good amount of my success to Olaf. But thanks also to Boo and If Then Elsa for all their data collection

and processing help, both exceptional undergraduate research assistants. Acoustics and fluid dynamics studies of high speed jet noise reduction devices

UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of Sc