Effects of pilot injection strategy on in-cylinder combustion and emission characteristics of PODE/methanol blends

2022 ◽  
Vol 228 ◽  
pp. 107168
Author(s):  
Jie Li ◽  
Junheng Liu ◽  
Qian Ji ◽  
Ping Sun ◽  
Mingliang Wei ◽  
...  
Fuel ◽  
2019 ◽  
Vol 236 ◽  
pp. 313-324 ◽  
Author(s):  
Haozhong Huang ◽  
Zhongju Li ◽  
Wenwen Teng ◽  
Chenzhong Zhou ◽  
Rong Huang ◽  
...  

2017 ◽  
Vol 142 ◽  
pp. 1267-1273 ◽  
Author(s):  
Jialin Liu ◽  
Hu Wang ◽  
Zunqing Zheng ◽  
Bin Mao ◽  
Linpeng Li ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3717
Author(s):  
Nikita Zuev ◽  
Andrey Kozlov ◽  
Alexey Terenchenko ◽  
Kirill Karpukhin ◽  
Ulugbek Azimov

Using biodiesel fuel in diesel engines for heavy-duty transport is important to meet the stringent emission regulations. Biodiesel is an oxygenated fuel and its physical and chemical properties are close to diesel fuel, yet there is still a need to analyze and tune the fuel injection parameters to optimize the combustion process and emissions. A four-injections strategy was used: two pilots, one main and one post injection. A highly advanced SOI decreases the NOx and the compression work but makes the combustion process less efficient. The pilot injection fuel mass influences the combustion only at injection close to the top dead center during the compression stroke. The post injection has no influence on the compression work, only on the emissions and the indicated work. An optimal injection strategy was found to be: pilot SOI 19.2 CAD BTDC, pilot injection fuel mass 25.4%; main SOI 3.7 CAD BTDC, main injection fuel mass 67.3% mg; post SOI 2 CAD ATDC, post injection fuel mass 7.3% (the injection fuel mass is given as a percentage of the total fuel mass injected). This allows the indicated work near the base case level to be maintained, the pressure rise rate to decrease by 20% and NOx emissions to decrease by 10%, but leads to a 5% increase in PM emissions.


Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6821
Author(s):  
Ju-Hwan Seol ◽  
Van Chien Pham ◽  
Won-Ju Lee

This paper presents research on the effects of the multiple injection strategies on the combustion and emission characteristics of a two-stroke heavy-duty marine engine at full load. The ANSYS FLUENT simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both single- and double-injection modes to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed good agreement with the measured values reported in the engine’s sea-trial technical reports. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 6.42% and 12.76%, while NO and soot emissions were reduced up to 24.16% and 68%, respectively, in the double-injection mode in comparison with the single-injection mode. However, the double-injection strategy increased the CO2 emission (7.58%) and ISFOC (23.55%) compared to the single-injection. These are negative effects of the double-injection strategy on the engine that the operators need to take into consideration. The results were in line with the literature reviews and would be good material for operators who want to reduce the engine exhaust gas emission in order to meet the stricter IMO emission regulations.


2018 ◽  
Vol 234 ◽  
pp. 03007
Author(s):  
Plamen Punov ◽  
Tsvetomir Gechev ◽  
Svetoslav Mihalkov ◽  
Pierre Podevin ◽  
Dalibor Barta

The pilot injection strategy is a widely used approach for reducing the noise of the combustion process in direct injection diesel engines. In the last generation of automotive diesel engines up to several pilot injections could occur to better control the rate of heat release (ROHR) in the cylinder as well as the pollutant formation. However, determination of the timing and duration for each pilot injection needs to be precisely optimised. In this paper an experimental study of the pilot injection strategy was conducted on a direct injection diesel engine. Single and double pilot injection strategy was studied. The engine rated power is 100 kW at 4000 rpm while the rated torque is 320 Nm at 2000 rpm. An engine operating point determined by the rotation speed of 1400 rpm and torque of 100 Nm was chosen. The pilot and pre-injection timing was widely varied in order to study the influence on the combustion process as well as on the fuel consumption.


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