Combined acoustic and aerodynamic investigation of the effect of inlet geometry on tip leakage flow noise of free-inlet free-exhaust low-speed axial flow fans

The performance and the emitted noise of a free inlet – free exhaust axial flow fan are influenced by the inlet geometry. In the present paper, the effect of bellmouth entries with various sizes on the tip leakage flow (TLF) noise is discussed. The aerodynamics phenomena are investigated using inlet...

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Bibliographic Details
Published inApplied acoustics Vol. 187; p. 108488
Main Authors Benedek, Tamás, Vad, János, Lendvai, Bálint
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2022
Subjects
Axial flow fan
Beamforming
Bellmouth entry
Fan noise
Tip leakage flow noise
Bellmouth entry
Beamforming
Axial flow fan
Tip leakage flow noise
Fan noise
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Summary:The performance and the emitted noise of a free inlet – free exhaust axial flow fan are influenced by the inlet geometry. In the present paper, the effect of bellmouth entries with various sizes on the tip leakage flow (TLF) noise is discussed. The aerodynamics phenomena are investigated using inlet velocity profile measurements and computational fluid dynamics (CFD) simulations. Noise source maps have been derived from phased array microphone measurements using the Rotating Source Identifier (ROSI) beamforming algorithm. The aerodynamic and acoustic data are evaluated in a combined manner. The results showed that with the use of a bellmouth entry of proper size, the TLF can be moderated, the double-leakage flow (DLF) can be eliminated, and the sound pressure level of the emitted noise can be reduced by 5–6 dB.
ISSN:0003-682X
1872-910X
DOI:10.1016/j.apacoust.2021.108488