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Optimum Design for Noise Reduction of a Two-Bladed Propeller Fan

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Numerical simulations were performed to investigate the sound generation mechanism of a propeller fan in the outdoor unit of an air conditioner. The vortex and separation flow around two- and three-bladed propeller fans were analyzed to locate the sources of noise. A two-bladed fan usually has a lower flow rate than a three-bladed fan at the same rotating speed. In general, a two-bladed fan should increase the rotating speed to obtain the same amount of flow rate as a three-bladed fan. The increased rotating speed of a two-bladed fan may results in a louder noise comparing a three-bladed fan. To overcome this drawback, an optimized two-bladed fan was proposed by increasing the solidity and pitch angle. During optimizing the two-bladed fan, the relative priorities of the design parameters were evaluated to identify the most important, and these parameters were then optimized using the response surface methodology. The overall sound pressure level (OASPL) of the new optimized two-bladed propeller fan was 5.2 dB lower than that of previous two-bladed fans and 1.2 dB lower than that of the optimized three-bladed fan.
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Document Type: Research Article

Publication date: September 1, 2015

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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