Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU125118" target="_blank" >RIV/00216305:26210/17:PU125118 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.4995/ILASS2017.2017.4995" target="_blank" >http://dx.doi.org/10.4995/ILASS2017.2017.4995</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4995/ILASS2017.2017.4995" target="_blank" >10.4995/ILASS2017.2017.4995</a>
Alternative languages
Result language
angličtina
Original language name
Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers
Original language description
It is well known that the spray characteristics of pressure-swirl atomizers are strongly linked to the internal flow and that an unstable air core may cause instabilities in the spray. In this paper, a 10:1 scale transparent Plexiglas (PMMA) model of a pressure-swirl atomizer as used in a small gas turbine is introduced. The internal flow was examined using high-speed imaging, laser-Doppler anemometry and computational fluid dynamics tools. The experimental and numerical results were analysed and compared in terms of the air core morphology and its temporal stability. Two different liquids were used, Kerosene-type Jet A-1 represented a commonly used fuel while p-Cymene (4-Isopropyltoluene) matched the refractive index of the Plexiglas atomizer body. The internal flow characteristics were set using dimensionless numbers i.e. the Reynolds number and Froude number. The flow test conditions were limited to inlet Reynolds numbers from 750 to 1750. Two atomizers were examined to represent a Simplex and Spill-return (SR) geometries. In a comparative manner, the SR atomizer features a central passage in the rear wall of the swirl chamber. The main advantage of this concept is that the fuel is always supplied to the swirl chamber at a high pressure therefore providing good atomization over a wide range of the injection flow rate. However, the presence of the spill orifice strongly affects the internal flow even if the spill-line is closed. The air core in the Simplex atomizer was found fully developed and stable. The SR atomizer behaved differently, the air core did not form at all, and the spray was therefore unstable.
Czech name
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Czech description
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Classification
Type
C - Chapter in a specialist book
CEP classification
—
OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
<a href="/en/project/GA15-09040S" target="_blank" >GA15-09040S: Dynamics of flow and droplets during spraying process of pressure-swirl atomizers</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Book/collection name
28TH CONFERENCE ON LIQUID ATOMIZATION AND SPRAY SYSTEMS, ILASS-EUROPE 2017
ISBN
978-84-9048-580-4
Number of pages of the result
8
Pages from-to
233-240
Number of pages of the book
1106
Publisher name
Neuveden
Place of publication
Valencie
UT code for WoS chapter
000428143600030