Details
| Original language | English |
|---|---|
| Publication status | Published - 2012 |
| Event | 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 - Heidelberg, Germany Duration: 2 Sept 2012 → 6 Sept 2012 |
Conference
| Conference | 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 |
|---|---|
| Country/Territory | Germany |
| City | Heidelberg |
| Period | 2 Sept 2012 → 6 Sept 2012 |
Abstract
Injection systems of modern diesel engines are one of the key components to increase the fuel efficiency and to lower pollutant emissions. Therefore, a detailed understanding of the spray generated by the injector nozzle is crucial to optimize the process of the mixture formation, ignition, combustion, and emission. In diesel injection systems the spray formation is significantly influenced by the internal flow of the injector and often influenced by cavitation. Increasingly important is the transient flow behavior during the needle lift. The aim of this study is the time-dependent numerical simulation of the internal flow processes including the multiphase processes with special emphasis to the time-dependent variation of the needle. The injector consists of a needle with an adapted needle cone geometry and a 8-hole sac-hole nozzle. The holes have a diameter of d = 247 μm with cylindrical geometry and sharp edges at the inlets. Experimental test data from a cold injection chamber provide boundary conditions and serve as a plausibility check. The injector needle movement is realized by a dynamic mesh. Several models have been evaluated. These were the combinations of two multiphase models (Eulerian and Mixture model), two cavitation models (Schnerr-und-Sauer, Zwart-Gerber-Belamri). A suitable combination is found from subsequent studies. Also the influence of vapour pressure was investigated. First results show strongly asymmetric two phase regions inside the nozzle for the transient initial and final part of the injection.
ASJC Scopus subject areas
- Materials Science(all)
- Surfaces, Coatings and Films
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2012. Paper presented at 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012, Heidelberg, Germany.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Comparison of various models for transient nozzle flow simulations including time-resolved needle lift
AU - Jollet, S.
AU - Willeke, T.
AU - Dinkelacker, F.
N1 - Publisher Copyright: © ICLASS 2012 - 12th Inte. Con. on Liquid Atom. and Spray Systems. All rights reserved.
PY - 2012
Y1 - 2012
N2 - Injection systems of modern diesel engines are one of the key components to increase the fuel efficiency and to lower pollutant emissions. Therefore, a detailed understanding of the spray generated by the injector nozzle is crucial to optimize the process of the mixture formation, ignition, combustion, and emission. In diesel injection systems the spray formation is significantly influenced by the internal flow of the injector and often influenced by cavitation. Increasingly important is the transient flow behavior during the needle lift. The aim of this study is the time-dependent numerical simulation of the internal flow processes including the multiphase processes with special emphasis to the time-dependent variation of the needle. The injector consists of a needle with an adapted needle cone geometry and a 8-hole sac-hole nozzle. The holes have a diameter of d = 247 μm with cylindrical geometry and sharp edges at the inlets. Experimental test data from a cold injection chamber provide boundary conditions and serve as a plausibility check. The injector needle movement is realized by a dynamic mesh. Several models have been evaluated. These were the combinations of two multiphase models (Eulerian and Mixture model), two cavitation models (Schnerr-und-Sauer, Zwart-Gerber-Belamri). A suitable combination is found from subsequent studies. Also the influence of vapour pressure was investigated. First results show strongly asymmetric two phase regions inside the nozzle for the transient initial and final part of the injection.
AB - Injection systems of modern diesel engines are one of the key components to increase the fuel efficiency and to lower pollutant emissions. Therefore, a detailed understanding of the spray generated by the injector nozzle is crucial to optimize the process of the mixture formation, ignition, combustion, and emission. In diesel injection systems the spray formation is significantly influenced by the internal flow of the injector and often influenced by cavitation. Increasingly important is the transient flow behavior during the needle lift. The aim of this study is the time-dependent numerical simulation of the internal flow processes including the multiphase processes with special emphasis to the time-dependent variation of the needle. The injector consists of a needle with an adapted needle cone geometry and a 8-hole sac-hole nozzle. The holes have a diameter of d = 247 μm with cylindrical geometry and sharp edges at the inlets. Experimental test data from a cold injection chamber provide boundary conditions and serve as a plausibility check. The injector needle movement is realized by a dynamic mesh. Several models have been evaluated. These were the combinations of two multiphase models (Eulerian and Mixture model), two cavitation models (Schnerr-und-Sauer, Zwart-Gerber-Belamri). A suitable combination is found from subsequent studies. Also the influence of vapour pressure was investigated. First results show strongly asymmetric two phase regions inside the nozzle for the transient initial and final part of the injection.
UR - http://www.scopus.com/inward/record.url?scp=85091978906&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85091978906
T2 - 12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012
Y2 - 2 September 2012 through 6 September 2012
ER -