A New Multi-Impingement-Wall Head Diffusion Combustion System (NICS-MH) of a DI Diesel Engine, Part 1

1994 ◽  
Author(s):  
Masaru Ogura ◽  
Bai-fu Lin
Keyword(s):  
Diesel Engine ◽  
Diffusion Combustion ◽  
Combustion System ◽  
Engine Part ◽  
Di Diesel Engine

Effects of the Re-Entrant Bowl Geometry on a DI Turbocharged Diesel Engine Performance and Emissions—A CFD Approach

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
S. Pasupathy Venkateswaran ◽  
G. Nagarajan
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Engine Performance ◽  
Maximum Diameter ◽  
Diffusion Combustion ◽  
Turbocharged Diesel Engine ◽  
Performance And Emissions ◽  
Di Diesel Engine ◽  
Fuel Mixing

The purpose of this study is to investigate the influence of re-entrant bowl geometry on both engine performance and combustion efficiency in a direct injection (DI), turbocharged diesel engine for heavy-duty applications. The piston bowl design is one of the most important factors that affect the air–fuel mixing and the subsequent combustion and pollutant formation processes in a DI diesel engine. The bowl geometry and dimensions, such as the pip region, bowl lip area, and toroidal radius, are all known to have an effect on the in-cylinder mixing and combustion processes. Based on the idea of enhancing diffusion combustion at the later stage of the combustion period, three different bowl geometries, namely, bowl 1 (baseline), bowl 2, and bowl 3 were selected and investigated. All the other relevant parameters, namely, compression ratio, maximum diameter of the bowl, squish clearance and injection rate were kept constant. A commercial CFD code STAR-CD was used to model the in-cylinder flows and combustion process, and experimental results of the baseline bowl were used to validate the numerical model. The simulation results show that, bowl 3 enhance the turbulence and hence results in better air-fuel mixing among all three bowls in a DI diesel engine. As a result, the indicated specific fuel consumption and soot emission reduced although the NOx emission is increased owing to better mixing and a faster combustion process. Globally, since the reduction in soot is larger (−46% as regards baseline) than the increase in NOx (+15% as regards baseline), it can be concluded that bowl 3 is the best trade-off between performance and emissions.

Effect of Combustion System Parameters on DI Diesel Engine Performance and Exhaust Emissions

2013 ◽  
Author(s):  
Prakash Kamat ◽  
Yogesh Aghav ◽  
Nitin Gokhale ◽  
Vikas Helchel ◽  
Ajit Patil ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
Combustion System ◽  
System Parameters ◽  
Di Diesel Engine

Study of the Combustion System of a New Small DI Diesel Engine with Advanced Common Rail Injection System

2003 ◽  
Author(s):  
Felice E. Corcione ◽  
Bianca M. Vaglieco ◽  
Giuseppe E. Corcione ◽  
M. Lavorgna ◽  
Rosario Lanzafame
Keyword(s):  
Diesel Engine ◽  
Common Rail ◽  
Injection System ◽  
Combustion System ◽  
Common Rail Injection System ◽  
Common Rail Injection ◽  
Di Diesel Engine

scholarly journals A relationship between diffusion combustion and exhaust smoke in a high-speed DI diesel engine.

1990 ◽  
Vol 56 (526) ◽  
pp. 1831-1836
Author(s):  
Toshishige MAEDA ◽  
Masahiro ISHIDA ◽  
Koichi EJIRI ◽  
Yoshihiro YOSHIMURA ◽  
Hironobu UEKI ◽  
...  
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Diffusion Combustion ◽  
Di Diesel Engine

Research and development of an advanced combustion system for the direct injection diesel engine

2005 ◽  
Vol 219 (2) ◽  
pp. 241-252 ◽  
Author(s):  
W H Su ◽  
T J Lin ◽  
H Zhao ◽  
Y Q Pei
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Combustion System ◽  
Multiple Injections ◽  
Hcci Combustion ◽  
Advanced Combustion ◽  
Chamber Design ◽  
Low Load ◽  
Di Diesel Engine

In order to obtain a simultaneous reduction in both NOx and particulate emissions from a direct injection (DI) diesel engine, an advanced combustion system has been researched and developed in the authors' laboratory. The new combustion system comprises homogeneous charge compression ignition (HCCI) combustion at low load by early and multiple injections, combined HCCI, and lean diffusion burning at medium and higher load conditions by means of a novel combustion chamber design and multiple injections. In this paper, the research and development of the enhanced mixing by means of a raised round object (referred to in this paper as BUMP) and its application to a diesel combustion chamber design is described. Then the experimental results from a DI diesel engine equipped with a multiple injection common rail (CR) fuel injection system and the new combustion chamber design will be presented and discussed. Engine testing has shown that the BUMP combustion chamber was very effective in reducing both NOx and smoke emissions. HCCI combustion by means of multiple injections leads to extremely low NOx emissions under low load operations. At medium and higher load operation conditions, quasi HCCI combustion combined with the BUMP combustion chamber could signficantly reduce NOx emissions without sacrificing particulate emission and fuel consumption.

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