NOISE GENERATED BY AIR FLOWING FROM SMALL HOLES

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

NOISE GENERATED BY AIR FLOWING FROM SMALL HOLES

Popis výsledku v původním jazyce

The control of air flow through HVAC systems is usually executed by throttling. The most frequently used control elements are control dampers. When closing these elements reduce the free flow cross-section and increase pressure losses. As a result the flow rate increases in the reduced cross-section and consequently, in most control elements, the acoustic energy generated into the environment grows very remarkably. This is caused by the very limited flow cross-section which can be qualified as a slot, i.e. an opening with a markedly smaller width compared with its length. The main topic of this paper is to present the results of experimental measurements and analyses of the causes of generation of acoustic energy in small holes and/or slots with a variable width. The measured levels of the sound power for individual types of slots are related with non-dimensional similarity criteria.

Název v anglickém jazyce

NOISE GENERATED BY AIR FLOWING FROM SMALL HOLES

Popis výsledku anglicky

The control of air flow through HVAC systems is usually executed by throttling. The most frequently used control elements are control dampers. When closing these elements reduce the free flow cross-section and increase pressure losses. As a result the flow rate increases in the reduced cross-section and consequently, in most control elements, the acoustic energy generated into the environment grows very remarkably. This is caused by the very limited flow cross-section which can be qualified as a slot, i.e. an opening with a markedly smaller width compared with its length. The main topic of this paper is to present the results of experimental measurements and analyses of the causes of generation of acoustic energy in small holes and/or slots with a variable width. The measured levels of the sound power for individual types of slots are related with non-dimensional similarity criteria.

Druh

D - Stať ve sborníku

CEP obor

JE - Nejaderná energetika, spotřeba a užití energie

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název statě ve sborníku

Seventeenth International Congress on Sound and Vibration (ICSV17)

ISBN

978-1-61782-255-1

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

1150-1157

Název nakladatele

IIAV - International Institute of Acoustics and Vibration

Místo vydání

Cairo

Místo konání akce

CAIRO

Datum konání akce

18. 7. 2010

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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