An analytical parametric study of the broadband noise from axial-flow fansThe rotating dipole analysis of Ffowcs Williams and Hawkings (1969) is used to predict the far field noise radiation due to various rotor broadband noise mechanisms. Consideration is given to inflow turbulence noise, attached boundary layer/trailing-edge interaction noise, tip-vortex formation noise, and trailing-edge thickness noise. The parametric dependence of broadband noise from unducted axial-flow fans on several critical variables is studied theoretically. The angle of attack of the rotor blades, which is related to the rotor performance, is shown to be important to the trailing-edge noise and to the tip-vortex formation noise.
Document ID
19880052479
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chou, Shau-Tak (Cornell Univ. Ithaca, NY, United States)
George, Albert R. (Cornell University Ithaca, NY, United States)