Research Papers: Flows in Complex Systems

Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower

[+] Author and Article Information
Aurélien Marsan

Department of Mechanical Engineering,
University of Sherbrooke,
Sherbrooke, QC J1K 2R1, Canada
e-mail: aurelien.marsan@usherbrooke.ca

Stéphane Moreau

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.

J. Fluids Eng 140(2), 021103 (Oct 19, 2017) (8 pages) Paper No: FE-16-1475; doi: 10.1115/1.4037976 History: Received July 22, 2016; Revised August 15, 2017

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.

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Fig. 3

Sound pressure level at the chimney outlet (dB)—900 rpm (gray)—1000 rpm (black)

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Fig. 2

View of the test case: (a) global view and (b) impeller

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Fig. 1

Global view of the aeraulic circuit. Dimensions are given in mm.

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Fig. 9

Influence of the rotor blade-to-blade cavities—1000 rpm URANS: (a) relative velocity magnitude in a meridian plane and (b) pressure in the midplane of the volute

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Fig. 10

Influence of the trapdoors: (a) pressure at rotor outlet and (b) pressure on the backwall of the volute

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Fig. 4

View of the mesh domains

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Fig. 5

Performance curves—900 rpm and 1000 rpm

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Fig. 6

Pressure rise through the components of the blower: inlet block, rotor, and volute: (a) 900 rpm and (b) 1000 rpm

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Fig. 7

Flow pattern at midplane of the volute—1000 rpm RANS: (a) 64,000 m3/h, (b) 56,000 m3/h, and (c) 49,000 m3/h

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Fig. 8

Inlet flow distortion—1000 rpm URANS

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Fig. 11

Division of the wall surface

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Fig. 12

Maximum amplitudes of wall pressure fluctuations: (a) 900 rpm and (b) 1000 rpm

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Fig. 13

Amplitudes of wall pressure fluctuations at 1BPF—–1000 rpm: (a) inlet block, (b) rotor blades, and (c) volute

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Fig. 14

Sound power level: (a) SWL—global and (b) SWL—surface elements (1000 rpm)

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Fig. 15

Directivity of the acoustic radiation at the BPF: (a) inlet, (b) blades root, (c) blades tip, (d) volute frontwall, (e) Volute backwall, and (f) volute sidewall



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