The injection of small amount of diesel fuel relies on the shortening of energizing signal. In such injection conditions, the needle does not reach the mechanical stroke-end and its displacement is defined as ballistic. Some specific experimental work has been performed on how the dynamics of injector needle is reflected on the fuel flow pattern within the nozzle. Due to the intrinsic difficulties of the field, just single axial hole injectors have been optically investigated in real time, by means of the most advanced X-ray techniques. In the current study, based on 3D-computational fluid dynamics modeling, the investigation has been extended to multihole injector layouts, under typical pilot/split injection conditions, namely, high injection pressure and low needle lift. The role of different factors on the flow development within the nozzle has been shown and discussed; the investigations have taken into account actual injector tip layouts and the response to the needle off-axis operating conditions. Results are presented highlighting the flow features within the nozzle and their reflects on the hole-to-hole differences.

References

References
1.
Kastengren
,
L.
,
Powell
,
C. F.
,
Liu
,
Z.
,
Fezzaa
,
K.
, and
Wang
,
J.
,
2009
, “
High-Speed X-Ray Imaging of Diesel Injector Needle Motion
,”
ASME
, Paper No. ICES2009-76032.10.1115/ICES2009-76032
2.
Powell
,
C. F.
,
Kastengren
,
A. L.
,
Liu
,
Z.
, and
Fezzaa
,
K.
,
2011
, “
The Effects of Diesel Injector Needle Motion on Spray Structure
,”
ASME J. Eng. Gas Turbines Power
,
133
(
1
), pp.
012802
012811
.10.1115/1.4001073
3.
Öing
,
H.
,
2000
, “
Entwicklung Eines Neuen Dieselmotorischen Injektorkonzeptes für Zukünftige Emissionsgrenzwerte
,” Doktor-Ingenieur Genehmigte Dissertation, Fachbereich Maschinenbau – Universität Hannover, Hannover, Germany.
4.
Öing
,
H.
Koyanagi
,
K.
,
Maly
,
R. R.
,
Renner
,
G.
, and
Stotz
,
M.
,
1999
, “
Einfluß von Einspritzverlauf und Düsenauslegung auf das Brennverhalten bei Pkw Common Rail Einspritzung; in Motorische Verbrennung – Aktuelle Probleme und Moderne Lösungsansätze
,” IV Tagung Motorische Verbrennung, Haus der Technik Essen, S.
185
194
.
5.
Satkoski
,
C.
, and
Shaver
,
G.
,
2011
, “
Piezoelectric Fuel Injection: Pulse-to-Pulse Coupling and Flow Rate Estimation
,”
IEEE/ASME Trans. Mechatron.
,
16
(
4
), pp.
627
642
.10.1109/TMECH.2010.2048334
6.
Chiatti
,
G.
,
Chiavola
,
O.
, and
Palmieri
,
F.
,
2008
, “
Flow Features in Reduced Dwell Time Diesel Injector
,”
SAE
Technical Paper No. 2008-01-0927.10.4271/2008-01-0927
7.
Wang
,
T.-C.
,
Han
,
J.-S.
,
Xie
,
X.-B.
,
Lai
,
M.-C.
,
Henein
,
N. A.
,
Schwarz
,
E.
, and
Bryzik
,
W.
,
2003
, “
Parametric Characterization of High-Pressure Diesel Fuel Injection Systems
,”
ASME J. Eng. Gas Turbines Power
,
125
(
2
), pp.
412
426
.10.1115/1.1498268
8.
Han
,
J. S.
,
Lu
,
P. H.
,
Xie
,
X. B.
,
Lai
,
M. C.
, and
Henein
,
N. A.
,
2002
, “
Investigation of Diesel Spray Primary Breakup and Development for Different Nozzle Geometries
,”
SAE
Technical Paper No. 2002-01-2775.10.4271/2002-01-2775
9.
Chiavola
,
O.
, and
Palmieri
,
F.
,
2007
, “
Modeling Needle Motion Influence on Nozzle Flow in High Pressure Injection System
,”
SAE
Technical Paper No. 2007-01-0250.10.4271/2007-01-0250
10.
AVL List,
2010
,
FIRE CFDWM
User Guide (Solver Version 2010)
,
AVL List
,
Graz, Austria
.
11.
AVL List,
2010
,
FIRE Multiphase Manual
,
AVL List
,
Graz, Austria
.
12.
von Kuensberg Sarre
,
C.
,
Kong
,
S.
, and
Reitz
,
R.
,
1999
, “
Modeling the Effects of Injector Nozzle Geometry on Diesel Sprays
,”
SAE
Technical Paper No. 1999-01-0912.10.4271/1999-01-0912
13.
LMS,
2011
,
AMESim Tutorials and User Guide
,
LMS
,
Leuven, Belgium
.
14.
Seykens
,
X. L. J.
,
Somers
,
L. M. T.
, and
Baert
,
R. S. G.
,
2005
, “
Detailed Modeling of Common Rail Fuel Injection Process
,”
Mecca. J. Middle Eur. Constr. Des Cars
,
III
, pp.
30
40
.
You do not currently have access to this content.