3. Noise reduction
Nota
In view of their very similar acoustic behavior, we've included the noise reduction measures for these two types of fan in the same section.
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3.1.1 Stingray noise
The reduction of line noise, which is of particular concern at high speeds, typically above 2,500 rpm, is achieved by means derived from the analysis of noise generation mechanisms described above (§
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Noise reduction
Bibliography
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(1) - LIGHTHILL (M.J.) -
On sound generated aerodynamically. General theory.
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Proc. Royal Soc., A 231, p. 505-514 (1952).
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(2) - KEMP (N.H.), SEARS (W.R.) -
The unsteady forces due to viscous wakes in turbomachines....
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