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- W2131233954 abstract "Experimental studies on noise radiation from a single-stage lifting fan operating at subsonic tip speeds are described. The effects on noise radiation of inlet flow distortion as a result of superimposed cross flow are presented. Under zero cross-flow conditions, narrow band analysis of the results shows the presence of discrete order tones, in addition to high-level tones at blade-passing frequencies at a subsonic tip speed of 628 fps. Propagating modes of these tones are identified with some reasonable success based on observed directivity patterns, using Tyler and Sofrin's radiation formula. Only the shaft orders at multiples of stator blade numbers giving a plane wave radiation are in evidence at lower fan speeds. Under cross-flow conditions, there is an increase of up to 10 db in the level of broadband noise. The shaft order tones become less conspicuous because of this rise in broadband noise. The radiation patterns of blade-passing tones show strong dependence on the cross flow. An unexpected reduction in peak blade-passing tone levels at some conditions of cross flow suggests the two interaction mechanisms, inflow distortion with rotor and rotor with stator, are interdependent." @default.
- W2131233954 created "2016-06-24" @default.
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- W2131233954 date "1972-10-01" @default.
- W2131233954 modified "2023-09-23" @default.
- W2131233954 title "Lifting Fan Noise Studies with Superimposed Cross Flows" @default.
- W2131233954 cites W2033156096 @default.
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- W2131233954 doi "https://doi.org/10.2514/3.59069" @default.
- W2131233954 hasPublicationYear "1972" @default.
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