Evaluation of composition and carbon atoms distribution of the exhaust hydrocarbons by varying post-injection parameters in DI diesel engine

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121662
Author(s):  
Sheikh Muhammad Farhan ◽  
Pan Wang ◽  
Yan Wu ◽  
Gang Wu ◽  
Lili Lei
Keyword(s):  
Diesel Engine ◽  
Post Injection ◽  
Injection Parameters ◽  
Di Diesel Engine

scholarly journals Effect of post-injection on combustion and exhaust emissions in DI diesel engine

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 116131 ◽  
Author(s):  
Yan Wu ◽  
Pan Wang ◽  
Sheikh Muhammad Farhan ◽  
Jing Yi ◽  
Lili Lei
Keyword(s):  
Diesel Engine ◽  
Exhaust Emissions ◽  
Post Injection ◽  
Di Diesel Engine

Effect of High Pressure Post Injection on Soot and NO Trade-Off in a DI Diesel Engine

2010 ◽  
Author(s):  
Kamran Poorghasemi ◽  
Fathollah Ommi ◽  
Vahid Esfahanian
Keyword(s):  
Diesel Engine ◽  
Soot Formation ◽  
Three Dimensional ◽  
Injection Pressure ◽  
Combustion Mechanism ◽  
Injection Timing ◽  
Post Injection ◽  
Multiple Injection ◽  
Trade Off ◽  
Di Diesel Engine

In DI Diesel engines NO and Soot trade off is an important challenge for Engineers. In this paper, at first, multiple injection strategy will be introduced as a useful way to reduce both NO and Soot emissions simultaneously. Then the effect of injection pressure in post injection on the engine emissions will be studied. Investigations have been conducted on DI diesel engine. To evaluate the benefits of multiple injection strategies and to reveal combustion mechanism, modified three dimensional CFD code KIVA-3V was used. Results showed that using post injection with appropriate dwell between injection pulses can be effective in simultaneously reduction of emissions. Based on computation results, NO reduction formation mechanism is a single injection with retarded injection timing. It is shown that reduced soot formation is because of the fact that the soot producing rich regions at the fuel spray head are not replenished by new fuel when the injection is stopped and then restarted. Also increasing injection pressure in post injection will reduce the Soot emission dramatically while NO is in control and it is due to increasing fuel burning rate in post injection pulse.

Visualization of the Effects of Post Injection and Swirl on the Combustion Process of a Passenger Car Common Rail DI Diesel Engine

2003 ◽  
Author(s):  
Arjan Helmantel ◽  
Joop Somhorst ◽  
Ingemar Denbratt
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Flame Temperature ◽  
Combustion Process ◽  
Small Diameter ◽  
Ccd Camera ◽  
Common Rail ◽  
Post Injection ◽  
Passenger Car ◽  
Di Diesel Engine

The effects of variations in injection strategy and swirl on a DI Diesel engine performance and emissions were tested. The cylinder head was fitted with a small diameter endoscope, coupled with a triggered CCD camera, in order to study the effect of these variations on the combustion process. The images that were taken of the combustion process were used to calculate the spatial and temporal distribution of flame temperature and soot kks factor by using the 2-color method. The engine used in the experiments is a single cylinder version of a modern, passenger car type, common rail Diesel engine with a displacement of 480 cc. The fitted endoscope caused very little interference with the combustion chamber due to its small dimensions. The 65 degree angle view of the endoscope allowed coverage of a large portion of the entire combustion chamber. The combustion images and derived temperatures and soot concentrations were used to study the influence of post injection and high swirl. Adding a third (post) injection to the pilot and main injection increases the mixing and the flame temperature during the second half of the combustion process, thereby improving soot oxidation. The fuel efficiency was not negatively affected by the later phasing of part of the heat release. Increased swirl of the intake air was also studied. An 80% increase in swirl-ratio was achieved by closing off one of the two intake ports with a butterfly valve. The improved mixing gave significant reductions in soot emissions, with a small increase in NOx formation.

Simulation Research on Post-Injection of Electronically Controlled Heavy-Duty Diesel Engine

2011 ◽  
Vol 121-126 ◽  
pp. 2238-2242
Author(s):  
Ming Hai Li ◽  
Feng Jiang ◽  
Biao Liu ◽  
Ming Gao Ouyang
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Pressure Rise ◽  
Injection System ◽  
Post Injection ◽  
Simulation Research ◽  
Di Diesel Engine ◽  
Heavy Duty Diesel

GT-Suite software is used to establish the simulation model of electronic fuel injection system for 16V280ZJ diesel engine. Combustion process simulation calculation is conducted to the direct injection (DI) diesel engine based on a main-post double injection scheme. Simulation parameters are modified based on the comparison with given experimental results. The calculation results effectively reflect the influence of fuel ratio and the interval angle between main and post injection over emission and fuel economy. Finally, in order to improve the engine emissions and reduce the pressure rise rate, we get the optimal injection solution for the main-post injection mode.

A Study of the Effects of Biofuel Use on Piston Lubrication During Fuel Post Injection in a DI Diesel Engine

2011 ◽  
Author(s):  
Koji Kikuhara ◽  
Akihiro Shibata ◽  
Akemi Ito ◽  
Dallwoo Kim ◽  
Yasuhiro Ishikawa ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Carbon Dioxide Emissions ◽  
Operating Conditions ◽  
Fuel Oil ◽  
Cylinder Wall ◽  
Post Injection ◽  
Friction Forces ◽  
Di Diesel Engine ◽  
Lubrication Condition

The reduction of both exhaust gases and carbon dioxide emissions is necessary to meet future emissions regulations for diesel engines. Exhaust after-treatment devices are gradually being applied to diesel engines to reduce exhaust gases. Diesel Particulate Filters (DPF), an after-treatment device for diesel engines, in some cases require post injection of fuel for its regeneration. Post injection is usually carried out at the mid point of the expansion stroke, and therefore causes fuel adhesion to the cylinder wall. However, using biofuels in a diesel engine is an effective way of reducing carbon dioxide emissions. It is well known that biofuels are chemically unstable, but the effects of biofuels on piston lubrication condition have not been thoroughly studied. In this study, piston lubrication condition during post injection in a single cylinder DI diesel engine using biofuel was investigated. Piston and ring friction forces were measured under engine operating conditions by means of a floating liner device to investigate the lubrication condition of the piston and rings. Both light fuel oil and biofuel were used in the measurements, with Rapeseed Methyl Ester (RME) being used as the biofuel. Lubricating oil on the cylinder wall was also sampled under engine operating conditions and the effect of post injection on fuel adhesion to the cylinder wall was analyzed. It was found that the effect of post injection on fuel adhesion to the cylinder wall was remarkable around the Top Dead Center (TDC), and the fuel dilution rate reached approximately 90%. The results of the measurement of the piston friction forces showed that post injection caused an increase in the friction forces at the Compression TDC (CTDC) in the cases of both RME and light fuel oil, and the friction forces at CTDC increased according to the delay of the post injection timing. The increase in the piston friction forces was moderate in the case of RME. It seems that the higher viscosity and the oiliness of RME suppressed the increase in piston friction forces at TDC. The following effects were found in this study. Fuel post injection caused fuel adhesion to the cylinder wall. Such phenomena affected the lubrication condition of the piston. In the case of RME, the increase in the piston friction forces caused by post injection was smaller than that of light fuel oil, but the effects on piston lubrication condition in the case of using other biofuels needs to be investigated.

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