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Design of the centrifugal fan of a belt-driven starter generator with reduced flow noise
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8692-0956
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-2711-4687
2019 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 76, p. 72-84Article in journal (Refereed) Published
Abstract [en]

Large eddy simulations based on the explicit algebraic subgrid-scale stress model were carried out to predict the flow-induced noise generated on the centrifugal fan of a belt-driven starter generator using Lighthill's analogy and the method of Ffowcs Williams and Hawkings. The surrounding air was approximated by an ideal gas at fixed room temperature (T in = 300 K), and the rotating velocity of the fan was considered to be 6000 rpm. The blade array angles were designed using the modulation method, and a large blade curvature was adopted. We identified several centrifugal fan design parameters that could minimize the flow-induced noise while also minimizing fan efficiency losses. Three design parameters: the top serrated edge (θ t ), the step leading edge (0.52 H b ) and the tail edge (d b and r b ), played a critical role in preventing vortex generation and collision, significantly weakening the surface pressure fluctuations on the blade. The maximum sound pressure level at 800 Hz at a specific location was reduced by 5.5 dB (at the top serrated edge) and 6.8 dB (at the step leading edge) relative to the baseline case. The sound power, calculated over a hemisphere surface of 950 mm, was reduced by 77.3% (at the top serrated edge) and 61.0% (at the step leading edge) relative to the baseline whereas the mass flow rates were reduced by 5.2% and 10.6%, respectively. Experiments were performed using the optimally designed fan in a semi-anechoic chamber. The predicted sound pressure level and frequency were in good agreement with the experimentally measured values.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 76, p. 72-84
Keywords [en]
Centrifugal fan, Explicit algebraic subgrid-scale stress model, Fan cooling performance, Flow-induced noise, Large eddy simulation
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-246461DOI: 10.1016/j.ijheatfluidflow.2019.01.016ISI: 000469905200006Scopus ID: 2-s2.0-85060885847OAI: oai:DiVA.org:kth-246461DiVA, id: diva2:1300588
Note

QC 20190329

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-06-24Bibliographically approved

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Wallin, StefanJohansson, Arne V.

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