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- W50759483 abstract "This study describes the comparative acoustic tests conducted on a 12 in. diameter fan-in-wing model with an extended inlet referenced to the standard shallow inlet. The aim of the tests was to find the effect of extending the depth of the inlet on the noise radiation characteristics of the fan, both at static and crossflow conditions. The studies also included induct sound measurements done to observe the change in the characteristics of the blade passing frequency tones due to crossflow over the fan.The extended inlet showed generally higher broadband noise levels and shaft order tone levels, both at static and crossflow conditions, which were particularly noticeable at high fan speeds. There were no large differences in the far field tone levels and directionality patterns of the blade passing frequency tones between the two inlets. In-duct sound measurements showed minor changes in the characteristics of blade passing frequency tones due to crossflow velocities." @default.
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- W50759483 date "1974-02-28" @default.
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- W50759483 title "Acoustic tests on a fan-in-wing model: Effects of an extended inlet" @default.
- W50759483 hasPublicationYear "1974" @default.
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