Acoustics and fluid dynamics studies of high speed
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Acoustics and fluid dynamics studies of high speed
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 ciencein:Aerospace EngineeringIt is entitled:Acoustics and Fluid Dynamics Studies of High Speed Jet Noise Reduction DevicesThis work and its defense approved 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 del turbofan exhaust simulator rig at a Reynold’s Number 0(1 o' ) through mean and time-resolved flow and aeroacoustic measurements. Various stream-wiAcoustics and fluid dynamics studies of high speed
se vorticity production devices, including conventional and modified chevron nozzles and CVG’s (Coupled Vortex Generators), were installed to increaseUNIVERSITY 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 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 total pressure probe on the baseline hardware to determine appropriate mean spatial scales, and to evaluate the boundary layer momentum thickness infAcoustics and fluid dynamics studies of high speed
luence on noise for a coaxial, turbulent jet. LDV of two velocity components determined the turbulence properties in the jet at various locations in tUNIVERSITY 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 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 e reductions for essentially all directivity angles, with the addition of a high-frequency source that appears consistent with a self-noise induced diAcoustics and fluid dynamics studies of high speed
pole.2Acknowledgements1 would like to thank those who supported this work, and the great amount of work that never will be represented throughout my lUNIVERSITY 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 idance. Also, he provided a worldclass environment with which to pursue this research effort.Dr. John Wojno at GE Aviation was my technical research supervisor 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 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 MartensAcoustics and fluid dynamics studies of high speed
, 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 .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 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
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 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 UNIVERSITY OF CINCINNATIDate: August 12. 2008I Christopher A. Harrishereby submit this work as part of the requirements for the degree of:Master of ScGọi ngay
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