Effects of High Temperature Fuel on In-Cylinder Fuel Mixture Formation Process for DI Engine

2002 ◽  
Vol 2002 (0) ◽  
pp. 443-444
Author(s):  
Kenjiro NAKAMA ◽  
Eiji MURASE ◽  
Shunji TOYODA ◽  
Jin KUSAKA ◽  
Yasuhiro Daisho
Keyword(s):  
High Temperature ◽  
Formation Process ◽  
Fuel Mixture ◽  
Mixture Formation

Effects of High Temperature Fuel on In-Cylinder Fuel Mixture Formation Process for Direct Injection Engine

2003 ◽  
Author(s):  
Kenjiro Nakama ◽  
Eiji Murase ◽  
Masahito Imada ◽  
Jin Kusaka ◽  
Yasuhiro Daisho
Keyword(s):  
High Temperature ◽  
Formation Process ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Mixture Formation ◽  
Direct Injection Engine

Multi-dimensional modeling of the air/fuel mixture formation process in a PFI engine for motorcycle applications

2009 ◽  
Author(s):  
T. Lucchini ◽  
G. D'Errico ◽  
F. Brusiani ◽  
G. M. Bianchi ◽  
Ž. Tuković ◽  
...  
Keyword(s):  
Formation Process ◽  
Fuel Mixture ◽  
Mixture Formation ◽  
Dimensional Modeling

Study of high-pressure air jet controlled compression ignition with compound thermodynamic cycle for combustion and emission formation process

2020 ◽  
pp. 146808742096933
Author(s):  
Xiangyu Meng ◽  
Sicheng Liu ◽  
Jingchen Cui ◽  
Jiangping Tian ◽  
Wuqiang Long ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Temperature ◽  
Formation Process ◽  
Combustion Process ◽  
Thermodynamic Cycle ◽  
Compression Ignition ◽  
Temperature Reaction ◽  
Air Jet ◽  
High Temperature Reaction

A novel method called high-pressure air (HPA) jet controlled compression ignition (JCCI) based on the compound thermodynamic cycle was investigated in this work. The combustion process of premixed mixture can be controlled flexibly by the high-pressure air jet compression, and it characterizes the intensified low-temperature reaction and two-stage high-temperature reaction. The three-dimensional (3D) computational fluid dynamics (CFD) numerical simulation was employed to study the emission formation process and mechanism, and the effects of high-pressure air jet temperature and duration on emissions were also investigated. The simulation results showed that the NOx formation is mainly affected by the first-stage high-temperature reaction due to the higher reaction temperature. Overall, this combustion mode can obtain ultra-low NOx emission. The second-stage high-temperature reaction plays an important role in the CO and THC formation caused by the mixing effect of the high-pressure air and original in-cylinder mixture. The increasing air jet temperature leads to a larger high-temperature in-cylinder region and more fuel in the first-stage reaction, and therefore resulting in higher NOx emission. However, the increasing air jet temperature can significantly reduce the CO and THC emissions. For the air jet duration comparisons, both too short and too long air jet durations could induce higher NOx emission. A higher air jet duration would result in higher CO emission due to the more high-pressure air jet with relatively low temperature.

Developing Planar Laser-Induced Fluorescence for the Investigation of the Mixture Formation Process in Hydrogen Engines

2004 ◽  
Author(s):  
Thomas Blotevogel ◽  
Jan Egermann ◽  
Jürgen Goldlücke ◽  
Alfred Leipertz ◽  
Matthias Hartmann ◽  
...  
Keyword(s):  
Formation Process ◽  
Laser Induced Fluorescence ◽  
Mixture Formation ◽  
Planar Laser Induced Fluorescence ◽  
Hydrogen Engines ◽  
Planar Laser

Formation of Thermally Induced Defects in Silica Optical Material

2013 ◽  
Vol 853 ◽  
pp. 62-67
Author(s):  
Zhong Yin Xiao ◽  
Jian Xiang Wen ◽  
Wen Yun Luo ◽  
Wen Kai Wu ◽  
Ren Xiang Gong ◽  
...  
Keyword(s):  
High Temperature ◽  
Formation Process ◽  
Thermal History ◽  
Defect Formation ◽  
Annealing Process ◽  
Optical Material ◽  
Thermally Induced ◽  
Silica Material ◽  
Heating Treatment ◽  
Induced Defects

Characteristics of silica optical material largely depend on its thermal history. In this paper, formation of thermally induced defects in silica optical material is studied. The formation process of defect is analyzed in detail. The results show that there is an obvious difference in defect formation induced by heating treatment when the composition of silica optical material changes. Defect formation mainly displays as the produce process when the initial defects of the silica material are zero. However, defect formation expresses as the produce and annealing process when the initial defects of the silica material are not zero. The initial defect concentration can be decreased significantly when the silica material is heated in high temperature. At the same time, the new defect is also produced. These theoretic results are consistent with the previous experimental ones.

Investigation of the mixture formation process with combined injection strategies in high-performance SI-engines

2016 ◽  
pp. 1233-1249 ◽  
Author(s):  
Daniel Koch ◽  
G. Wachtmeister ◽  
Marlene Wentsch ◽  
M. Chiodi ◽  
Michael Bargende ◽  
...  
Keyword(s):  
Formation Process ◽  
High Performance ◽  
Mixture Formation ◽  
Si Engines ◽  
Injection Strategies

scholarly journals Evaluation of the Mixture Formation Process of High Performance Engine with a Combined Experimental and Numerical Methodology

2014 ◽  
Vol 45 ◽  
pp. 869-878 ◽  
Author(s):  
Claudio Forte ◽  
Gian Marco Bianchi ◽  
Enrico Corti ◽  
Buono Michele ◽  
Fantoni Stefano
Keyword(s):  
Formation Process ◽  
High Performance ◽  
Mixture Formation

Multi-Cycle Simulation of the Mixture Formation Process of an High Performance Engine at Part Load Condition

2012 ◽  
Author(s):  
Claudio Forte ◽  
Gian Marco Bianchi ◽  
Enrico Corti ◽  
Stefano Fantoni
Keyword(s):  
High Performance ◽  
Load Condition ◽  
Experimental Tests ◽  
Fuel Mixture ◽  
Critical Issue ◽  
Transient Condition ◽  
Mixture Formation ◽  
Part Load ◽  
Cycle Simulation ◽  
Load Conditions

Transient operation of engines leads to air fuel (A/F) ratio excursions, which can increase engine emissions. These excursions have been attributed to the formation of fuel films in the intake port, which are caused by a portion of the intake fuel impinging and adhering on the relatively cool port surface. These films act as a source or sink which cause the AF variations depending upon the transient condition. Gaining a fundamental understanding of the nature and quantity of such films may assist in future fuel mixture preparation designs that could aid in emission reductions, yet would not require overly expensive nor complicated systems. The control of air to fuel ratio is a critical issue for high performance engines: due to the low stroke-to-bore ratio the maximum power is reached at very high regimes, letting little time to the fuel to evaporate and mix with air. The injector located upstream the throttle causes a lot of fuel to impinge the throttle and intake duct walls, slowing the dynamics of mixture formation in part load conditions. The aim of this work is to present a CFD methodology for the evaluation of mixture formation dynamics applied to a Ducati high performance engine under part load conditions. The phenomena involved in the process are highly heterogeneous, and particular care must be taken to the choice of CFD models and their validation. In the present work all the main models involved in the simulations are validated against experimental tests available in the literature, selected based on the similarity of physical conditions of those of the engine configuration under analysis. The multi-cycle simulation methodology here presented reveals to be a useful tool for the evaluation of the mixture dynamics and for the evaluation of injection wall film compensator models.

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