Contribution to study the effect of exhaust gas recirculation EGR on HCCI combustion mode

2017 ◽  
Vol 35 (1) ◽  
pp. 183-190 ◽  
Author(s):  
Slimane Benhorma ◽  
Mokhtar Aouissi ◽  
C. Mansour ◽  
A. Bounif
Keyword(s):  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Combustion Mode ◽  
Hcci Combustion ◽  
Gas Recirculation

Effect of Turbulence and External Exhaust Gas Recirculation on HCCI Combustion Mode and Exhaust Emissions

2009 ◽  
Vol 23 (9) ◽  
pp. 4295-4303 ◽  
Author(s):  
Francisco J. Jiménez-Espadafor ◽  
Miguel Torres Garcia ◽  
José A. Correa Herrero ◽  
José A. Becerra Villanueva
Keyword(s):  
Exhaust Gas Recirculation ◽  
Exhaust Emissions ◽  
Exhaust Gas ◽  
Combustion Mode ◽  
Hcci Combustion ◽  
Gas Recirculation

Chemical kinetic mechanisms for HCCI combustion of wet ethanol with exhaust gas recirculation

2020 ◽  
Author(s):  
Filipe A. Herzer ◽  
Jean L. S. Fagundez ◽  
Mario E. S. Martins ◽  
Nina P. G. Salau
Keyword(s):  
Exhaust Gas Recirculation ◽  
Chemical Kinetic ◽  
Exhaust Gas ◽  
Hcci Combustion ◽  
Kinetic Mechanisms ◽  
Gas Recirculation

The effect of axial charge stratification and exhaust gases on combustion ‘development’ in a homogeneous charge compression ignition engine

2008 ◽  
Vol 222 (11) ◽  
pp. 2171-2183 ◽  
Author(s):  
P G Aleiferis ◽  
A G Charalambides ◽  
Y Hardalupas ◽  
A M K P Taylor ◽  
Y Urata
Keyword(s):  
Exhaust Gas Recirculation ◽  
Injection Timing ◽  
Cylinder Wall ◽  
Exhaust Gas ◽  
Compression Ignition ◽  
Intake Valve ◽  
Stratified Charge ◽  
Hcci Combustion ◽  
Gas Recirculation ◽  
Homogeneous Charge

A high-swirl low-compression-ratio, optically accessed engine that was able to produce a stratified charge was used to investigate the differences in homogeneous charge compression ignition (HCCI) combustion and in the propagation of the autoignition front between a non-stratified and a stratified charge. Natural-light images were acquired using a fast camera to visualize HCCI combustion and to quantify the location of autoignition, the apparent ‘propagation speed’ of the autoignition front, and its variations between closed-valve injection timing (leading to a nearly homogeneous charge) and open-valve injection timing (leading to a strongly axially stratified charge), owing to temperature inhomogeneities that were introduced by utilizing a camshaft which allowed 40 per cent internal exhaust gas recirculation (iEGR). Experimental results show that, in the case without exhaust gas recirculation (EGR) and with closed-valve injection timing, autoignition started under the primary intake valve near the cylinder wall, while, in the case without EGR and with open-valve injection timing, autoignition started between the exhaust valve and the secondary intake valve, closer to the centre of the piston. With 40 per cent iEGR and closed-valve injection timing, autoignition started between the exhaust valve and the primary intake valve near the cylinder wall. These differences can be explained by the difference in the location of hot gases due to the injection timing or due to iEGR. Finally, without EGR, a ‘uniform’ autoignition front of HCCI combustion from the original sites of autoignition was observed compared with a more ‘random development’ of the autoignition front with 40 per cent iEGR. Strong local inhomogeneities (possibly a very rich mixture at a low temperature) could be present with 40 per cent iEGR.

Defeat of the Soot/NOx Trade-off Using Biodiesel-Ethanol in a Moderate Exhaust Gas Recirculation Premixed Low-Temperature Combustion Mode

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Haoyue Zhu ◽  
Stanislav V. Bohac ◽  
Zhen Huang ◽  
Dennis N. Assanis
Keyword(s):  
Low Temperature ◽  
Ignition Delay ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Low Temperature Combustion ◽  
Combustion Mode ◽  
Trade Off ◽  
Temperature Combustion ◽  
Premixed Low Temperature Combustion ◽  
Gas Recirculation

The soot/nitric oxides (NOx) trade-off of diesel, biodiesel, and biodiesel–ethanol in a moderate exhaust gas recirculation (EGR) premixed low temperature combustion (LTC) mode is investigated in this study. Compared to diesel, biodiesel demonstrates poorer spray behavior and shorter ignition delay, but its oxygen content results in less soot. Blending ethanol into biodiesel enhances spray behavior, prolongs ignition delay, and further increases fuel oxygen fraction, resulting in a larger reduction in soot. In the moderate EGR premixed low temperature combustion mode, an obvious soot/NOx trade-off is demonstrated with diesel fuel. The soot/NOx trade-off is improved by biodiesel fuel and defeated by the biodiesel–ethanol blend. Low soot, low NOx, and high combustion efficiency are achieved with the biodiesel–ethanol blend and proper EGR rate.

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