Large-scale radial blowers are widely used in factories and are one of the main sources of noise. The present study aims at identifying the noise generation mechanisms in such a radial blower in order to suggest simple modifications that could be made in order to reduce the noise. The flow in a representative large-scale radial blower is investigated thanks to unsteady Reynolds-averaged Navier–Stokes (URANS) numerical simulations. The radiated noise is calculated, thanks to an in-house propagation code based on the Ffowcs Williams Hawkings' (FWH) analogy, SherFWH. The results highlight the main noise generation mechanisms, in particular the interaction between the rotating blades and the tongue, and the interaction between the rotating blades and the trapdoors located on the volute sidewall. Some modifications of the geometry are suggested.
Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower
Department of Mechanical Engineering,
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 22, 2016; final manuscript received August 15, 2017; published online October 19, 2017. Assoc. Editor: Olivier Coutier-Delgosha.
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Marsan, A., and Moreau, S. (October 19, 2017). "Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower." ASME. J. Fluids Eng. February 2018; 140(2): 021103. https://doi.org/10.1115/1.4037976
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