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- W2032102963 abstract "This work was motivated by evidence of naturally occurring inlet vortices as an important source of tonal noise from axial flow fans. Inlet vortices are a recognized consequence of confined inlet conditions, as especially when rotors operate near adjacent bounding surfaces. Experimental observation suggests that the inlet vortex field is characterized by very long streamwise scales with a relatively stationary field of circulations in the rotor plane. A combined theoretical and experimental study of a single inlet vortex penetrating the rotor plane reveals the separate roles of vortex properties of circulation strength, core radius, and core velocity deficit in influencing harmonic noise levels. Experimentally, half-delta wings were mounted at various incidence angles in the inlet bell-mouth to produce vortices of known properties. Theoretically, vortices of equivalent properties were impressed on the rotor blades, using linearized unsteady aerodynamics to calculate the fluctuating blade loads. Dipole radiation from individual blades was summed with appropriate phase relationships to estimate the total noise field and its harmonic content. Measured and predicted acoustic levels agreed reasonably well. Some discrepancies are noted and discussed. [Work supported by Canadian DRB & NRC.]" @default.
- W2032102963 created "2016-06-24" @default.
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- W2032102963 date "1976-04-01" @default.
- W2032102963 modified "2023-09-25" @default.
- W2032102963 title "The inlet vortex as a source of tonal rotor noise" @default.
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- W2032102963 doi "https://doi.org/10.1121/1.2002914" @default.
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