Créé le : 06/02/2013
Yvon Goth, Michel Besombes, Christian Chassaignon - 01/04/2012 - Congrès Fan 2012…
We present the experimental results of a technology aiming at the cancellation of the tonal noise of fans, using calibrated obstructions placed upstream or downstream in the flow close to the fan. When placed at the optimal distance and angle, the obstruction generates pressure pulsations that interact with the fan pressure fluctuations in a destructive way, allowing to cancel the noise at the blade passing frequency, and, in some cases, at its first harmonic.
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