Analysis of Advanced Multiple Injection Strategies in a Heavy-Duty Diesel Engine Using Optical Measurements and CFD-Simulations

2008 ◽  
Author(s):  
Tobias Husberg ◽  
Ingemar Denbratt ◽  
Anders Karlsson
Keyword(s):  
Diesel Engine ◽  
Optical Measurements ◽  
Multiple Injection ◽  
Heavy Duty ◽  
Cfd Simulations ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Injection Strategies

scholarly journals Computational study of the effect of different injection angle on heavy duty diesel engine combustion

2009 ◽  
Vol 13 (3) ◽  
pp. 9-21 ◽  
Author(s):  
Ali Ranjbar ◽  
Kurosh Sedighi ◽  
Mousa Farhadi ◽  
Mohsen Pourfallah
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Computational Study ◽  
Exhaust Emission ◽  
Cylinder Pressure ◽  
Heavy Duty ◽  
Injection Angle ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Injection Strategies

Diesel engines exhausting gaseous emission and particulate matter have long been regarded as one of the major air pollution sources, particularly in metropolitan areas, and have been a source of serious public concern for a long time. The choosing various injection strategies is not only motivated by cost reduction but is also one of the potentially effective techniques to reduce exhaust emission from diesel engines. The purpose of this study is to investigate the effect of different injection angles on a heavy duty diesel engine and emission characteristics. The varieties of injection angle were simulated and the emissions like soot and NO is calculated. The comparison between the different injection strategies was also investigated. A combustion chamber for three injection strategies (injection direction with angles of ?=67.5, 70, and 72.5 degree) was simulated. The comparative study involving rate of heat release, in-cylinder temperature, in-cylinder pressure, NO and soot emissions were also reported for different injection strategies. The case of ?=70 is optimum because in this manner the emissions are lower in almost most of crank angle than two other cases and the in-cylinder pressure, which is a representation of engine power, is higher than in the case of ?=67.5 and just a little lower than in the case of ?=72.5.

Study of Pilot Injection for the Improvement of Combustion and Emissions Characteristics in a Heavy-Duty Diesel Engine

2014 ◽  
Vol 651-653 ◽  
pp. 866-874 ◽  
Author(s):  
Liang Chen ◽  
Hong Zeng ◽  
Xiao Bei Cheng
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Injection Timing ◽  
Pilot Injection ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Injection Strategies

A 6-cylinder, turbocharged, common rail heavy-duty diesel engine was used in this study. The effect of pilot injection strategies on diesel fuel combustion process, heat release rate, emission and economy of diesel engine is studied. The pilot injection strategies include pilot injection timing and pilot injection mass to achieve the homogeneous compression ignition and lower temperature combustion of diesel engine. The two-color method was applied to take the flame images in the engine cylinder and obtain soot concentration distribution. The results demonstrate that with the advance of pilot injection timing, the peak in-cylinder pressure becomes lower, the ignition delay of the main combustion is shortened, the NOXand soot emissions are reduced, but the HC and CO emissions are increased. With the increase of pilot injection fuel mass, the heat release rate of the pilot injection combustion and the maximum rate of pressure rise increase, NOXand HC emissions are higher, and PM and CO emissions are reduced. The pilot combustion flame is non-luminous.

Numerical Investigation of Fuel Effects on Soot Emissions at Heavy-Duty Diesel Engine Conditions

2018 ◽  
Author(s):  
Meng Tang ◽  
Yuanjiang Pei ◽  
Yu Zhang ◽  
Michael Traver ◽  
David Cleary ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Turbulence Model ◽  
Soot Formation ◽  
Heavy Duty ◽  
Cfd Simulations ◽  
Heavy Duty Diesel Engine ◽  
Soot Emissions ◽  
Heavy Duty Diesel ◽  
Lift Off ◽  
Soot Model

Gasoline compression ignition (GCI) engine technology has shown the potential to achieve high fuel efficiency with low criteria pollutant emissions. In order to guide the design and optimization of GCI combustion, it is essential to develop high-fidelity simulation tools. Building on the previous work in computational fluid dynamic (CFD) simulations of spray combustion, this work focuses on predicting the soot emissions in a constant-volume vessel representative of heavy-duty diesel engine applications for an ultra-low sulfur diesel (ULSD) and a high reactivity (Research Octane Number 60) gasoline, and comparing the soot evolution characteristics of the two fuels. Simulations were conducted using both Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) turbulence models. Extensive model validations were performed against the experimental soot emissions data for both fuels. It was found that the simulation results using the LES turbulence model agreed better with the measured ignition delays and liftoff lengths than the RANS turbulence model. In addition, two soot models were evaluated in the current study, including an empirical two-step soot formation and oxidation model, and a detailed soot model that involves poly-aromatic hydrocarbon (PAH) chemistry. Validations showed that the separation of the flame lift-off location and the soot lift-off location and the relative natural luminosity signals were better predicted by the detailed soot model combined with the LES turbulence model. Qualitative comparisons of simulated local soot concentration distributions against experimental measurements in the literature confirmed the model’s performance. CFD simulations showed that the transition of domination from soot formation to soot oxidation was fuel-dependent, and the two fuels exhibited different temporal and spatial characteristics of soot emissions. CFD simulations also confirmed the lower sooting propensity of gasoline compared to ULSD under all investigated conditions.

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