Publication detail
Comprehensive Study Of Unsteady Pressure Pulsations Induced By The Spiral Vortex Structure In A Conical Diffuser
ŠTEFAN, D. RUDOLF, P. HUDEC, M. HABÁN, V.
Czech title
Studium nestacionárních tlakových pulzací vyvolaných spirální vírovou struktůrou v kónickém difuzoru
English title
Comprehensive Study Of Unsteady Pressure Pulsations Induced By The Spiral Vortex Structure In A Conical Diffuser
Type
conference proceedings
Language
en
Original abstract
The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out on the experimental apparatus consisting of the swirl generator (source of strong swirling flow) and the conical diffuser (equipped with the series of pressure transducers). The experimental measurements are focused on complex pressure measurements in order to distinguish between synchronous and asynchronous pulsations induced by the vortex structure and examine their changes in relation to the flow rate. The numerical simulations are carried out to visualize vortex shape and compare computed pressure fields with the experimental ones. The open source CFD software OpenFOAM employing realizable k-ɛ turbulence model is used for the numerical simulations. Agreements between numerical end experimental results are discussed.
Czech abstract
Vířivé proudění se často rozpadne do spirální vírové struktůry, která je nestabilní a způsobuje nestacionární rychlostní a tlakové pole. Byl proveden numerický a expeimentální výzkum tohoto jevu s využitím experimentálního zařízení – vírového generátoru (zdroj silného zavíření) a kónického difuzoru (osazeného tlakovými snímačemi). Experimentální měření je zaměřeno na rozklad tlakových pulzací do synchroních a asynchroních složek a jejich změnu se zvyšujícícm se průtokem. S využitím numerické simulace je provedena vizualizace tvaru vírové struktůry a porovnání spočteného tlakového pole s experimentálním měřením. Pro numerický výpočet byl využit open-source CFD software OpenFOAM s k-ɛ modelem turbulence. Závěrem byla sledována shoda experimentu s numerickým výpočtem.
English abstract
The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out on the experimental apparatus consisting of the swirl generator (source of strong swirling flow) and the conical diffuser (equipped with the series of pressure transducers). The experimental measurements are focused on complex pressure measurements in order to distinguish between synchronous and asynchronous pulsations induced by the vortex structure and examine their changes in relation to the flow rate. The numerical simulations are carried out to visualize vortex shape and compare computed pressure fields with the experimental ones. The open source CFD software OpenFOAM employing realizable k-ɛ turbulence model is used for the numerical simulations. Agreements between numerical end experimental results are discussed.
Keywords in English
swirling flow, pressure pulsations, diffuser, spiral vortex, OpenFOAM
RIV year
2015
Released
09.09.2015
Publisher
Faculty of Technologies and Systems
Location
Ljubljana
ISBN
978-961-6770-31-6
Book
Proceedings of 6th IAHR meeting of the Working Group, IAHRWG 2015
Pages from–to
331–338
Pages count
8
BIBTEX
@proceedings{BUT116583,
author="David {Štefan} and Pavel {Rudolf} and Martin {Hudec} and Vladimír {Habán},
title="Comprehensive Study Of Unsteady Pressure Pulsations Induced By The Spiral Vortex Structure In A Conical Diffuser",
booktitle="Proceedings of 6th IAHR meeting of the Working Group, IAHRWG 2015",
year="2015",
month="September",
pages="331--338",
publisher="Faculty of Technologies and Systems",
address="Ljubljana",
isbn="978-961-6770-31-6"
}