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Multi-Port Eduction of Installation Effects Applied to a Small Axial Fan

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In HVAC or domestic appliance applications, industrial fan noise is usually characterized under uniform inflow profile. However, those ideal conditions are rarely met when the fan is installed in its final product. The fan is often in the wake of an obstacle or after a bend, which causes non-uniform ingested flow. Under those distorted inflow condition, the fan noise signature changes causing an increase in noise power level. This paper presents a multiport eduction technique to investigate those installation effects in a compact axial fan situated in a circular duct. The noise emitted by the fan was compared to independent measurements performed using the ISO-5136 method to highlight the benefits of the multi-port technique regarding the elimination of the spectral features caused by the reflections of the acoustic wave on the duct terminations. Installation effects generated by circumferential and turbulence flow distortions were produced using wooden grids. The influence of those grids on the scattering coefficients of the tested module led to an analysis of the changes in acoustic power radiated by the fan under those non-uniform ingested flows.
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Document Type: Research Article

Publication date: January 1, 2019

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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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