Publication detail
Influence of the PDA setup on a quality of velocity distributions
OTÁHAL, J. FIŠER, J. KOŠNER, J. JÍCHA, M.
Czech title
Vliv nastavení systému PDA na kvalitu získaných rychlostí
English title
Influence of the PDA setup on a quality of velocity distributions
Type
conference paper
Language
en
Original abstract
The PDA (Phase Doppler Anemometer) is well known as one of the most useful techniques to study particle velocity and particle size distributions in two-phase flows. There are many variations to the setup of this diagnostic system, especially its geometrical parameters. Research of effervescent atomization, on a dense spray of the near-nozzle region in particular, shows that it is necessary to carry out a functionality analysis of the PDA system for such applications. The off-axis angle (scattering angle) has the essential influence on signal quality. Thus, a set of experiments has been carried out with one pressure nozzle under the same operation conditions for values of off-axis angle in the range of 30 -80 . The PDA user guide recommends a value of 73.7 as the optimum angle. Theoretically, there is no influence on acquired values of particular velocity, but this idea may be affected if the carrier of the velocity is not detected.
Czech abstract
Článek popisuje vliv nastavení PDA systému na získané rychlostní pole ve spreji. Chování systému bylo zkoumáno v oblasti lomového signálu, tzn. pro nastavení prijimaci optiky v rozsahu 30-80 stupnu.
English abstract
The PDA (Phase Doppler Anemometer) is well known as one of the most useful techniques to study particle velocity and particle size distributions in two-phase flows. There are many variations to the setup of this diagnostic system, especially its geometrical parameters. Research of effervescent atomization, on a dense spray of the near-nozzle region in particular, shows that it is necessary to carry out a functionality analysis of the PDA system for such applications. The off-axis angle (scattering angle) has the essential influence on signal quality. Thus, a set of experiments has been carried out with one pressure nozzle under the same operation conditions for values of off-axis angle in the range of 30 -80 . The PDA user guide recommends a value of 73.7 as the optimum angle. Theoretically, there is no influence on acquired values of particular velocity, but this idea may be affected if the carrier of the velocity is not detected.
Keywords in Czech
PDA systém, sprej, dvoufázové proudění, effervescent tryska
Keywords in English
Phase Doppler Anemometer, spray, two-phase flow, effervescent nozzle
RIV year
2007
Released
29.05.2007
Publisher
Ústav pro hydrodynamiku AV ČR, v. v. i.
Location
Praha
ISBN
978-80-87117-01-9
Book
21st Sympozium on Anemometry, Proceedings
Pages from–to
127–130
Pages count
150
BIBTEX
@inproceedings{BUT24006,
author="Jan {Otáhal} and Jan {Fišer} and Jan {Košner} and Miroslav {Jícha},
title="Influence of the PDA setup on a quality of velocity distributions",
booktitle="21st Sympozium on Anemometry, Proceedings",
year="2007",
month="May",
pages="127--130",
publisher="Ústav pro hydrodynamiku AV ČR, v. v. i.",
address="Praha",
isbn="978-80-87117-01-9"
}