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

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

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.

Investigation of a FLOX®-Based Combustor for a Micro Gas Turbine With Exhaust Gas Recirculation

2017 ◽  
Author(s):  
S. Hasemann ◽  
A. Huber ◽  
C. Naumann ◽  
M. Aigner
Keyword(s):  
Gas Turbines ◽  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
Chemical Kinetic ◽  
Working Fluid ◽  
Total Efficiency ◽  
Exhaust Gas ◽  
Low Oxygen ◽  
Micro Gas Turbine ◽  
Gas Recirculation

Micro gas turbines (MGT) offer interesting advantages for the use in combined heat and power (CHP) systems. A possibility to raise the total efficiency of a MGT is the introduction of an external exhaust gas recirculation (EGR). The composition of the working fluid due to EGR affects the combustion process and the formation of pollutants. Changes in flame position, flame volume and flame intensity as well as rising CO emissions in state of the art industrial burners have been described by several authors before. This paper describes the experimental investigation of a single stage FLOX®-based combustor for a MGT in the power range of 1–3 kWel applied with EGR. The tests were performed on an atmospheric test rig with optical access. The combustion air was preheated up to 718 °C and diltued with N2, CO2 and steam. A probe of the exhaust gas was analyzed for emissions and OH* chemiluminescence measurements were performed. In addition to the experiments, chemical kinetic simulations were performed. Results show, that the examined combustor is able to work stable even at very low oxygen levels (down to 12.6 %) at combustor inlet, although the possible range of operation under EGR conditions is reduced. The measured increase of CO emissions matches to the performed simulations.

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