Influence of the shroud leading edge shape on the axial-fan noise

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00344630" target="_blank" >RIV/68407700:21220/20:00344630 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.11159/htff20.164" target="_blank" >https://doi.org/10.11159/htff20.164</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.11159/htff20.164" target="_blank" >10.11159/htff20.164</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of the shroud leading edge shape on the axial-fan noise

Popis výsledku v původním jazyce

The paper is focused on the noise reduction of the low-pressure axial fan by the modification of the shroud leading edge shape. The CFD and CAA simulation of the fan are performed in commercial software PowerFLOW based on the Lattice Boltzmann method. The propagation of the acoustics waves to the far-field was carried out by the Ffowcs-Williams & Hawkings acoustics analogy. The far-field acoustics data from the simulation match with the results from the ISO measurement in the semi-anechoic chamber. Direct acoustics results of the near-field capture dominant noise sources of the cooling axial fan in blade tip area. Vortexes produced by the flow separation from the shroud inlet edge are carried by the rotating fan blade. The interaction of these flow structures with the blade tip surface produce strong subharmonic component in the acoustic spectra with lower frequency compared to blade passing frequency. Four different shrouds geometry modifications are analyzed. The modification of the shape eliminates subharmonic component of the fan sound spectra and reduces overall fan noise.

Název v anglickém jazyce

Influence of the shroud leading edge shape on the axial-fan noise

Popis výsledku anglicky

The paper is focused on the noise reduction of the low-pressure axial fan by the modification of the shroud leading edge shape. The CFD and CAA simulation of the fan are performed in commercial software PowerFLOW based on the Lattice Boltzmann method. The propagation of the acoustics waves to the far-field was carried out by the Ffowcs-Williams & Hawkings acoustics analogy. The far-field acoustics data from the simulation match with the results from the ISO measurement in the semi-anechoic chamber. Direct acoustics results of the near-field capture dominant noise sources of the cooling axial fan in blade tip area. Vortexes produced by the flow separation from the shroud inlet edge are carried by the rotating fan blade. The interaction of these flow structures with the blade tip surface produce strong subharmonic component in the acoustic spectra with lower frequency compared to blade passing frequency. Four different shrouds geometry modifications are analyzed. The modification of the shape eliminates subharmonic component of the fan sound spectra and reduces overall fan noise.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering (MCM’20)

ISBN

978-1-927877-66-1

ISSN

—

e-ISSN

2369-8136

Počet stran výsledku

8

Strana od-do

1-8

Název nakladatele

Avestia Publishing, International ASET Inc.

Místo vydání

Ottawa

Místo konání akce

online

Datum konání akce

16. 8. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—