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Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding †

Department of Fluid Mechanics, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Bertalan Lajos u. 4-6, H-1111 Budapest, Hungary
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This paper is a revised version of our paper published in Proceedings of the European Turbomachinery Conference ETC14, Gdansk, Poland, 12–16 April 2021.
Int. J. Turbomach. Propuls. Power 2022, 7(1), 2; https://doi.org/10.3390/ijtpp7010002
Received: 28 September 2021 / Revised: 31 December 2021 / Accepted: 4 January 2022 / Published: 7 January 2022
This paper presents a critical overview on worst-case design scenarios for which low-speed axial flow fans may exhibit an increased risk of blade resonance due to profile vortex shedding. To set up a design example, a circular-arc-cambered plate of 8% relative curvature is investigated in twofold approaches of blade mechanics and aerodynamics. For these purposes, the frequency of the first bending mode of a plate of arbitrary circular camber is expressed by modeling the fan blade as a cantilever beam. Furthermore, an iterative blade design method is developed for checking the risky scenarios for which spanwise and spatially coherent shed vortices, stimulating pronounced vibration and noise, may occur. Coupling these two approaches, cases for vortex-induced blade resonance are set up. Opposing this basis, design guidelines are elaborated upon for avoiding such resonance. Based on the approach presented herein, guidelines are also developed for moderating the annoyance due to the vortex shedding noise. View Full-Text
Keywords: axial flow fan; blade vibration; low tip speed; preliminary fan design; vortex shedding axial flow fan; blade vibration; low tip speed; preliminary fan design; vortex shedding
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MDPI and ACS Style

Daku, G.; Vad, J. Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding. Int. J. Turbomach. Propuls. Power 2022, 7, 2. https://doi.org/10.3390/ijtpp7010002

AMA Style

Daku G, Vad J. Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding. International Journal of Turbomachinery, Propulsion and Power. 2022; 7(1):2. https://doi.org/10.3390/ijtpp7010002

Chicago/Turabian Style

Daku, Gábor, and János Vad. 2022. "Preliminary Design Guidelines for Considering the Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding" International Journal of Turbomachinery, Propulsion and Power 7, no. 1: 2. https://doi.org/10.3390/ijtpp7010002

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