Record Display for the EPA National Library CatalogRECORD NUMBER: 1 OF 1
|Main Title||Turbulence Induced Noise in a Single Stage Axial Flow Fan.|
|Publisher||Defense Technical Information Center,|
|Report Number||TM-74-157; AD-A009 232; N00017-73-C-1418|
|Subjects||Turbulent flow. ; Acoustic emissions. ; Axial flow fans. ; Turbulence. ; Noise pollution. ; Turbomachinery. ; Compressor blades. ; Cascades(fluid dynamics) ; Acoustics. ; Jet and Gas Turbine Engines.|
"AD-A009 232." "TM-74-157." "N00017-73-C-1418." "Filmed 6-9-75 NTIS." Microfiche.
The sound generated by the interaction of inlet turbulence with a rotating compressor blade row is investigated. Currently, there are two theories relating the rotor geometry and blade aerodynamics to the spectrum of the radiated sound. These theories are extended to include the cascade effect by incorporating a cascade aerodynamic response function for the unsteady lift on the blades into their analyses. To experimentally study this noise source, an aeroacoustic fan facility was designed and built. The parameters investigated include turbulence intensity and longitudinal integral length scale, blade speed, flow coefficient, and blade spacing.