Abstract
Compared to conventional injection techniques, Gasoline Direct Injection (GDI) has a lot of advantages such as increased fuel efficiency, high power output and low emission levels, which can be more accurately controlled. Therefore, this technique is an important topic of today's injection system research. Although the operating conditions of GDI injectors are simpler from a numerical point of view because of smaller Reynolds and Weber numbers compared to Diesel injection systems, accurate simulations of the breakup in the vicinity of the nozzle are very challenging. Combined with the complications of experimental techniques that could be applied inside the nozzle and at the nozzle exit, this is the reason for the lack of understanding the primary breakup behavior of current GDI injectors. In this work, this issue is addressed by combining high-fidelity primary breakup simulations in the vicinity of the nozzle exit, which use the velocity profile at the nozzle exit as boundary condition, and common Lagrange spray simulations. In detail, these enhanced simulations of a 6-hole state-of-the-art GDI injector are compared with the results of fully-Lagrange spray (FLS) simulations and experiments. It is shown that the accuracy of common Lagrange spray simulations can be increased by the combination with high-fidelity primary breakup simulations. This approach avoids the necessity of assuming a droplet size distribution at the nozzle exit, which requires usually tuning by using experimental data. Thus, its potential for a-priori spray predictions, which are for example desired within the injector design process, is much higher.
| Original language | English (US) |
|---|---|
| Journal | SAE Technical Papers |
| Volume | 2015-April |
| Issue number | April |
| DOIs | |
| State | Published - Apr 14 2015 |
| Event | SAE 2015 World Congress and Exhibition - Detroit, United States Duration: Apr 21 2015 → Apr 23 2015 |
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ASJC Scopus subject areas
- Automotive Engineering
- Safety, Risk, Reliability and Quality
- Pollution
- Industrial and Manufacturing Engineering
Cite this
A New Euler/Lagrange Approach for Multiphase Simulations of a Multi-Hole GDI Injector. / Bode, Mathis; Falkenstein, Tobias; Le Chenadec, Vincent; Kang, Seongwon; Pitsch, Heinz; Arima, Toshiyuki; Taniguchi, Hiroyoshi.
In: SAE Technical Papers, Vol. 2015-April, No. April, 14.04.2015.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - A New Euler/Lagrange Approach for Multiphase Simulations of a Multi-Hole GDI Injector
AU - Bode, Mathis
AU - Falkenstein, Tobias
AU - Le Chenadec, Vincent
AU - Kang, Seongwon
AU - Pitsch, Heinz
AU - Arima, Toshiyuki
AU - Taniguchi, Hiroyoshi
PY - 2015/4/14
Y1 - 2015/4/14
N2 - Compared to conventional injection techniques, Gasoline Direct Injection (GDI) has a lot of advantages such as increased fuel efficiency, high power output and low emission levels, which can be more accurately controlled. Therefore, this technique is an important topic of today's injection system research. Although the operating conditions of GDI injectors are simpler from a numerical point of view because of smaller Reynolds and Weber numbers compared to Diesel injection systems, accurate simulations of the breakup in the vicinity of the nozzle are very challenging. Combined with the complications of experimental techniques that could be applied inside the nozzle and at the nozzle exit, this is the reason for the lack of understanding the primary breakup behavior of current GDI injectors. In this work, this issue is addressed by combining high-fidelity primary breakup simulations in the vicinity of the nozzle exit, which use the velocity profile at the nozzle exit as boundary condition, and common Lagrange spray simulations. In detail, these enhanced simulations of a 6-hole state-of-the-art GDI injector are compared with the results of fully-Lagrange spray (FLS) simulations and experiments. It is shown that the accuracy of common Lagrange spray simulations can be increased by the combination with high-fidelity primary breakup simulations. This approach avoids the necessity of assuming a droplet size distribution at the nozzle exit, which requires usually tuning by using experimental data. Thus, its potential for a-priori spray predictions, which are for example desired within the injector design process, is much higher.
AB - Compared to conventional injection techniques, Gasoline Direct Injection (GDI) has a lot of advantages such as increased fuel efficiency, high power output and low emission levels, which can be more accurately controlled. Therefore, this technique is an important topic of today's injection system research. Although the operating conditions of GDI injectors are simpler from a numerical point of view because of smaller Reynolds and Weber numbers compared to Diesel injection systems, accurate simulations of the breakup in the vicinity of the nozzle are very challenging. Combined with the complications of experimental techniques that could be applied inside the nozzle and at the nozzle exit, this is the reason for the lack of understanding the primary breakup behavior of current GDI injectors. In this work, this issue is addressed by combining high-fidelity primary breakup simulations in the vicinity of the nozzle exit, which use the velocity profile at the nozzle exit as boundary condition, and common Lagrange spray simulations. In detail, these enhanced simulations of a 6-hole state-of-the-art GDI injector are compared with the results of fully-Lagrange spray (FLS) simulations and experiments. It is shown that the accuracy of common Lagrange spray simulations can be increased by the combination with high-fidelity primary breakup simulations. This approach avoids the necessity of assuming a droplet size distribution at the nozzle exit, which requires usually tuning by using experimental data. Thus, its potential for a-priori spray predictions, which are for example desired within the injector design process, is much higher.
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U2 - 10.4271/2015-01-0949
DO - 10.4271/2015-01-0949
M3 - Conference article
AN - SCOPUS:84938323538
VL - 2015-April
JO - SAE Technical Papers
JF - SAE Technical Papers
SN - 0148-7191
IS - April
ER -