Abstract
A blade loading model is formulated for the interaction of an axial-flow fan rotor with turbulent wakes from inlet guide vanes. From this, the spectra of both the blade lift and the associated sound field are computed. The analysis and results arc similar to those in the analogous case treated previously by the author for a stator interacting with the wakes from an upstream rotor [D. B. Hanson, “Unified Analysis of Fan Stator Noise,” J. Acoust. Soc. Am. 54, 1571–1591 (1973)]. The turbulence in the wakes causes a smooth broad-band spectrum component, while the spatially periodic portion of the wakes causes periodic components in the blade lift and sound field. The spectrum peaks do not exhibit bandspreading or “haystacking,” except for fans with inlet guide vane wakes which are wider than the gap between adjacent rotor blades.
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