scholarly journals Smoke Reduction Effects by Post Injection for Various Injection Parameters and Combustion Chamber Shapes in a Diesel Engine

2014 ◽  
Author(s):  
Naoto Horibe ◽  
Tatsuya Komizo ◽  
Takashi Sumimoto ◽  
Hao Wang ◽  
Takuji Ishiyama
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Post Injection ◽  
Injection Parameters

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.

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

110 Effects of Injection Parameters and Combustion Chamber Geometry on Performance and Emissions of a DI-PCCI Diesel Engine

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _1-16_
Author(s):  
Teppei MATSUMOTO ◽  
Ken TAKAHASHI ◽  
Ali MOHAMMADI ◽  
Sung-Sub KEE ◽  
Takuji ISHIYAMA
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Injection Parameters ◽  
Performance And Emissions

Influence of Post Injection on Emission Characteristics of a High-Pressure Common-Rail Diesel Engine Fueled with Biodiesel Blends

2014 ◽  
Vol 852 ◽  
pp. 808-814
Author(s):  
Di Ming Lou ◽  
Chen Chen Zhang ◽  
Zhi Yuan Hu ◽  
Pi Qiang Tan ◽  
Jian Jun Lin
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Common Rail ◽  
Injection Timing ◽  
Particulate Emissions ◽  
Post Injection ◽  
Biodiesel Blends ◽  
Injection Parameters ◽  
Injection Quantity ◽  
High Pressure Common Rail

An experimental study was conducted in a high-pressure common-rail diesel engine fueled with biodiesel-diesel blends (the volume ratio of biodiesel is 20%). Influences of post-injection parameters on gaseous and particulate emissions are studied. The results show that post injection timing has greater influence on particulate emissions of biodiesel engine in comparison with post injection quantity. With the delay of post injection timing, NOX emissions firstly reduce and then increase and again slightly reduce, while particulate emissions initially increase and then decrease and again soar, indicating a trade-off relationship. With the increase of post injection quantity, NOX emissions hardly change except at the low engine load, while particulate emissions increase in general. In order to improve the emission performance comprehensively, the injection parameters have to be recalibrated and split injection strategy has to be reformulated when the diesel engine is fueled with biodiesel blends.

scholarly journals Numerical investigation of injection parameters and piston bowl geometries on emission and thermal performance of DI diesel engine

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
Ikhtedar Husain Rizvi ◽  
Rajesh Gupta
Keyword(s):  
Diesel Engine ◽  
Thermal Performance ◽  
Equivalence Ratio ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Injection Nozzle ◽  
Piston Bowl ◽  
Injection Parameters ◽  
Nozzle Size ◽  
Engine Emission

AbstractTightening noose on engine emission norms compelled manufacturers globally to design engines with low emission specially NOx and soot without compromising their performance. Amongst various parameters, shape of piston bowls, injection pressure and nozzle diameter are known to have significant influence over the thermal performance and emission emanating from the engine. This paper investigates the combined effect of fuel injection parameters such as pressure at which fuel is injected and the injection nozzle size along with shape of piston bowl on engine emission and performance. Numerical simulation is carried out using one cylinder naturally aspirated diesel engine using AVL FIRE commercial code. Three geometries of piston bowls with different tumble and swirl characteristics are considered while maintaining the volume of piston bowl, compression ratio, engine speed and fuel injected mass constant along with equal number of variations for injection nozzle size and pressures for this analysis. The investigation corroborates that high swirl and large turbulence kinetic energy (TKE) are crucial for better combustion. TKE and equivalence ratio also increased as the injection pressure increases during the injection period, hence, enhances combustion and reduces soot formation. Increase in nozzle diameter produces higher TKE and equivalence ratio, while CO and soot emission are found to be decreasing and NOx formation to be increasing. Further, optimization is carried out for twenty-seven cases created by combining fuel injection parameters and piston bowl geometries. The case D2H1P1 (H1 = 0.2 mm, P1 = 200 bar) found to be an optimum case because of its lowest emission level with slightly better performance.

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