Simulation and Experimental Research on Species in Direct-Injection Diesel Engine

2014 ◽  
Vol 577 ◽  
pp. 244-247
Author(s):  
Yong Feng Liu ◽  
Hong Sen Tian ◽  
Xiao She Jia ◽  
Pu Cheng Pei ◽  
Yong Lu
Keyword(s):  
Diesel Engine ◽  
Mixture Fraction ◽  
Direct Injection ◽  
Three Dimension ◽  
Stoichiometric Mixture ◽  
Flamelet Model ◽  
Direct Injection Diesel Engine ◽  
Numerical Effort ◽  
Turbulent Flow Field ◽  
Coordinates Transformation

To simulate the combustion species for direct-injection diesel engines, the new flamelet model is presented and used. The model is based on stoichiometric mixture fraction space, and a way of separating the numerical effort associated with the solution of the turbulent flow field from that of solving the chemistry is offered. The new species equations are carried out through coordinates transformation. The results from the species equation are developed and three-dimension entity model with the mixture fraction is got. Then the boundary conditions are put into the new flamelet model. Furthermore the pollutions emissions are calculated and compared with the experimental data. It gives a new way to predict the pollutants for direct-injection diesel engine.

Applying the Representative Interactive Flamelet Model to Evaluate the Potential Effect of Wall Heat Transfer on Soot Emissions in a Small-Bore Direct-Injection Diesel Engine

2002 ◽  
Vol 124 (4) ◽  
pp. 1042-1052 ◽  
Author(s):  
C. Hergart ◽  
N. Peters
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Particle Growth ◽  
Potential Effect ◽  
Two Phase ◽  
Flamelet Model ◽  
Detailed Chemistry ◽  
Direct Injection Diesel Engine ◽  
Soot Emissions

Capturing the physics related to the processes occurring in the two-phase flow of a direct-injection diesel engine requires a highly sophisticated modeling approach. The representative interactive flamelet (RIF) model has gained widespread attention owing to its ability of correctly describing ignition, combustion, and pollutant formation phenomena. This is achieved by incorporating very detailed chemistry for the gas phase as well as for the soot particle growth and oxidation, without imposing any significant computational penalty. This study addresses the part load soot underprediction of the model, which has been observed in previous investigations. By assigning flamelets, which are exposed to the walls of the combustion chamber, with heat losses calculated in a computational fluid dynamics (CFD) code, predictions of the soot emissions in a small-bore direct-injection diesel engine are substationally improved. It is concluded that the experimentally observed emissions of soot may have their origin in flame quenching at the relatively cold combustion chamber walls.

SPRAY CHARACTERISTICS IN A DIRECT-INJECTION DIESEL ENGINE

1996 ◽  
Vol 6 (1) ◽  
pp. 95-109 ◽  
Author(s):  
H. C. Yang ◽  
Hong Sun Ryou ◽  
Y. T. Jeong ◽  
Young Ki Choi
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Spray Characteristics ◽  
Direct Injection Diesel Engine

scholarly journals Effects of pilot injection timing and EGR on a modern V6 common rail direct injection diesel engine

2013 ◽  
Vol 50 ◽  
pp. 012008 ◽  
Author(s):  
Nik Rosli Abdullah ◽  
Rizalman Mamat ◽  
Miroslaw L Wyszynski ◽  
Anthanasios Tsolakis ◽  
Hongming Xu
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Common Rail ◽  
Injection Timing ◽  
Pilot Injection ◽  
Direct Injection Diesel Engine

Predicted Paths of Soot Particles in the Cylinders of a Direct Injection Diesel Engine

2012 ◽  
Author(s):  
Wan Mohd Faizal Wan Mahmood ◽  
Antonino LaRocca ◽  
Paul J. Shayler ◽  
Fabrizio Bonatesta ◽  
Ian Pegg
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Soot Particles ◽  
Direct Injection Diesel Engine

Effect of altitude conditions on combustion and performance of a turbocharged direct-injection diesel engine

2021 ◽  
pp. 095440702110262
Author(s):  
Zhentao Liu ◽  
Jinlong Liu
Keyword(s):  
Diesel Engine ◽  
High Altitude ◽  
Diesel Engines ◽  
Direct Injection ◽  
Pressure Rise ◽  
Ambient Conditions ◽  
Allowable Limit ◽  
Spray Formation ◽  
Direct Injection Diesel Engine ◽  
And Performance

Market globalization necessitates the development of heavy duty diesel engines that can operate at altitudes up to 5000 m without significant performance deterioration. But the current scenario is that existing studies on high altitude effects are still not sufficient or detailed enough to take effective measures. This study applied a single cylinder direct injection diesel engine with simulated boosting pressure to investigate the performance degradation at high altitude, with the aim of adding more knowledge to the literature. Such a research engine was conducted at constant speed and injection strategy but different ambient conditions from sea level to 5000 m in altitude. The results indicated the effects of altitude on engine combustion and performance can be summarized as two aspects. First comes the extended ignition delay at high altitude, which would raise the rate of pressure rise to a point that can exceed the maximum allowable limit and therefore shorten the engine lifespan. The other disadvantage of high-altitude operation is the reduced excess air ratio and gas density inside cylinder. Worsened spray formation and mixture preparation, together with insufficient and late oxidation, would result in reduced engine efficiency, increased emissions, and power loss. The combustion and performance deteriorations were noticeable when the engine was operated above 4000 m in altitude. All these findings support the need for further fundamental investigations of in-cylinder activities of diesel engines working at plateau regions.

scholarly journals Computer Modelling For 4-Stroke Direct Injection Diesel Engine

2008 ◽  
Vol 33-37 ◽  
pp. 801-806
Author(s):  
Abdul Rahim Ismail ◽  
Rosli Abu Bakar ◽  
Semin Ali ◽  
Ismail Ali
Keyword(s):  
Diesel Engine ◽  
Simulation Study ◽  
Engine Speed ◽  
Computer Modelling ◽  
Direct Injection ◽  
One Dimension ◽  
Effective Pressure ◽  
Operational Parameters ◽  
Direct Injection Diesel Engine ◽  
Theoretical Results

Study on computational modeling of 4-stroke single cylinder direct injection diesel engine is presented. The engine with known specification is being modeled using one dimension CFD GT-Power software. The operational parameters of the engine such as power, torque, specific fuel consumption and mean effective pressure which are dependent to engine speed are being discussed. The results from the simulation study are compared with the theoretical results to get the true trend of the results.

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