Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer
The formation of pollutant emissions in jet engines is closely related to the fuel distribution inside the combustor. Hence, the characteristics of the spray formed during primary breakup are of major importance for an accurate prediction of the pollutant emissions. Currently, an Euler−Lag...
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doaj-9eb9650439fe47998526c67235193a742020-11-25T02:22:45ZengMDPI AGEnergies1996-10732019-07-011214283510.3390/en12142835en12142835Close Nozzle Spray Characteristics of a Prefilming Airblast AtomizerSimon Holz0Samuel Braun1Geoffroy Chaussonnet2Rainer Koch3Hans-Jörg Bauer4Institut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie, 76131 Karlsruher, GermanySteinbuch Centre for Computing, Karlsruher Institut für Technologie, 76128 Karlsruher, GermanyInstitut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie, 76131 Karlsruher, GermanyInstitut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie, 76131 Karlsruher, GermanyInstitut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie, 76131 Karlsruher, GermanyThe formation of pollutant emissions in jet engines is closely related to the fuel distribution inside the combustor. Hence, the characteristics of the spray formed during primary breakup are of major importance for an accurate prediction of the pollutant emissions. Currently, an Euler−Lagrangian approach for droplet transport in combination with combustion and pollutant formation models is used to predict the pollutant emissions. The missing element for predicting these emissions more accurately is well defined starting conditions for the liquid fuel droplets as they emerge from the fuel nozzle. Recently, it was demonstrated that the primary breakup can be predicted from first principles by the Lagrangian, mesh-free, Smoothed Particle Hydrodynamics (SPH) method. In the present work, 2D Direct Numerical Simulations (DNS) of a planar prefilming airblast atomizer using the SPH method are presented, which capture most of the breakup phenomena known from experiments. Strong links between the ligament breakup and the resulting spray in terms of droplet size, trajectory and velocity are demonstrated. The SPH predictions at elevated pressure conditions resemble quite well the effects observed in experiments. Significant interdependencies between droplet diameter, position and velocity are observed. This encourages to employ such multidimensional interdependence relations as a base for the development of primary atomization models.https://www.mdpi.com/1996-1073/12/14/2835prefilming airblast atomizationprimary breakupligamentspraySmoothed Particle Hydrodynamicsmultivariate statistics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Simon Holz Samuel Braun Geoffroy Chaussonnet Rainer Koch Hans-Jörg Bauer |
spellingShingle |
Simon Holz Samuel Braun Geoffroy Chaussonnet Rainer Koch Hans-Jörg Bauer Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer Energies prefilming airblast atomization primary breakup ligament spray Smoothed Particle Hydrodynamics multivariate statistics |
author_facet |
Simon Holz Samuel Braun Geoffroy Chaussonnet Rainer Koch Hans-Jörg Bauer |
author_sort |
Simon Holz |
title |
Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer |
title_short |
Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer |
title_full |
Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer |
title_fullStr |
Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer |
title_full_unstemmed |
Close Nozzle Spray Characteristics of a Prefilming Airblast Atomizer |
title_sort |
close nozzle spray characteristics of a prefilming airblast atomizer |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2019-07-01 |
description |
The formation of pollutant emissions in jet engines is closely related to the fuel distribution inside the combustor. Hence, the characteristics of the spray formed during primary breakup are of major importance for an accurate prediction of the pollutant emissions. Currently, an Euler−Lagrangian approach for droplet transport in combination with combustion and pollutant formation models is used to predict the pollutant emissions. The missing element for predicting these emissions more accurately is well defined starting conditions for the liquid fuel droplets as they emerge from the fuel nozzle. Recently, it was demonstrated that the primary breakup can be predicted from first principles by the Lagrangian, mesh-free, Smoothed Particle Hydrodynamics (SPH) method. In the present work, 2D Direct Numerical Simulations (DNS) of a planar prefilming airblast atomizer using the SPH method are presented, which capture most of the breakup phenomena known from experiments. Strong links between the ligament breakup and the resulting spray in terms of droplet size, trajectory and velocity are demonstrated. The SPH predictions at elevated pressure conditions resemble quite well the effects observed in experiments. Significant interdependencies between droplet diameter, position and velocity are observed. This encourages to employ such multidimensional interdependence relations as a base for the development of primary atomization models. |
topic |
prefilming airblast atomization primary breakup ligament spray Smoothed Particle Hydrodynamics multivariate statistics |
url |
https://www.mdpi.com/1996-1073/12/14/2835 |
work_keys_str_mv |
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