Numerical Simulation of the Effect of Ethanol on Diesel HCCI Combustion Using Multi-Zone Model

2012 ◽  
Vol 229-231 ◽  
pp. 78-81 ◽  
Author(s):  
Su Wei Zhu ◽  
Chun Mei Wang ◽  
Ye Jian Qian ◽  
Li Jun Ou ◽  
Hui Chun Wang
Keyword(s):  
Low Temperature ◽  
Zone Model ◽  
Compression Ignition ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Hcci Combustion ◽  
Active Intermediate ◽  
Simulation Results ◽  
Homogenous Charge Compression Ignition ◽  
Heat Released

This study investigates the potential of controlling diesel homogenous charge compression ignition (HCCI) combustion by blending ethanol, which inhibits low temperature oxidation offering the possibility to control ignition in HCCI combustion. The simulation results from a multi-zone model show that the ethanol reduces the key active intermediate radicals OH, CH2O, H2O2, delays the low temperature oxidation reaction (LTR), reduces the heat released during LTR stage. As a result, it retards the main combustion stage.

Combustion control and operating range expansion in an homogeneous charge compression ignition engine with direct in-cylinder injection of reaction inhibitors

2005 ◽  
Vol 6 (4) ◽  
pp. 341-359 ◽  
Author(s):  
H Ogawa ◽  
N Miyamoto ◽  
N Kaneko ◽  
H Ando
Keyword(s):  
Low Temperature ◽  
Homogeneous Charge Compression Ignition ◽  
Water Injection ◽  
Combustion Efficiency ◽  
Compression Ignition ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Operating Range ◽  
Rapid Combustion ◽  
Charge Temperature

Light naphtha, which exhibits two-stage ignition, was induced from the intake manifold and water or a low-ignitability fuel, which does not exhibit low temperature oxidation, was directly injected early in the compression stroke for ignition suppression in an homogeneous charge compression ignition (HCCI) engine. Their quantitative balance was flexibly controlled to optimize ignition timing according to operating conditions. Ultra-low NOx and smokeless combustion without knocking or misfiring was realized over a wide operating range with water or alcohol injection. The water injection significantly reduced the low-temperature oxidation, which suppressed the increase in charge temperature and the rapid combustion caused by the high-temperature oxidation. Rapid combustion was suppressed by reductions in the maximum in-cylinder gas temperature due to water injection while the combustion efficiency suffered. Therefore, the maximum charge temperature needs to be controlled within an extremely limited range to maintain a satisfactory compromise between mild combustion and high combustion efficiency. Alcohols inhibit low-temperature oxidation more strongly than other oxygenated or unoxygenated hydrocarbons, water, and hydrogen. Chemical kinetic modelling with methanol showed a reduction of OH radical before the onset of low-temperature oxidation, and this may be the main mechanism by which alcohols inhibit low-temperature oxidation.

310 Influence of sub-fuels on low temperature oxidation reaction of iso-Octane HCCI combustion

2015 ◽  
Vol 2015.23 (0) ◽  
pp. 181-182
Author(s):  
Ichiro Taoka ◽  
Masaki Naruke ◽  
Kunitoshi Kanno ◽  
Kotaro Tanaka ◽  
Mitsuru Konno
Keyword(s):  
Low Temperature ◽  
Oxidation Reaction ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Hcci Combustion

Experiment Research of Coal’s Spontaneous Combustion Characters

2014 ◽  
Vol 1077 ◽  
pp. 66-70
Author(s):  
Yan Min Zheng ◽  
Jin Feng Zhang
Keyword(s):  
Low Temperature ◽  
Spontaneous Combustion ◽  
Control Measures ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Spontaneous Combustion Of Coal ◽  
Prevention And Control Measures ◽  
And Control ◽  
Dsc Curves ◽  
Heat Released

On the basis of physical oxygen uptake, use the instrument to identify the spontaneous combustion of Yang quan coal, and combination the insulation oxide of coal as well as the TG-DSC experiment to analysis of low-temperature oxidation of coal, though the DSC curves, combined with the insulation oxide experimental to analysis the size of the heat. In the end, we can come to the conclusion about the law and the different temperature parameters of the low-temperature oxidation. At the same time, the temperature when a large number of heat released by coals oxidation were also known ,and laid a theoretical foundation to develop prevention and control measures for the spontaneous combustion of coal mines.

On the low-temperature oxidation of isobutane and propylene

1955 ◽  
Vol 8 (3) ◽  
pp. 370 ◽  
Author(s):  
JJ Batten ◽  
MJ Ridge
Keyword(s):  
Low Temperature ◽  
Induction Period ◽  
Gas Phase ◽  
Early Stage ◽  
Reaction Vessel ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Alkyl Hydroperoxides ◽  
Active Intermediate

The low-temperature oxidation of isobutane and propylene has been studied by interrupting the reaction by withdrawing the partly reacted mixture from the reaction vessel. After treatment designed to destroy peroxides the mixture was returned to the reaction vessel. The results show that the termination of the induction period is due to the accumulation of an active intermediate or intermediates in the gas phase. In both systems these intermediates are probably not alkyl hydroperoxides. �� Changes in the surface of the reaction vessel brought about by processes occurring in the early stage. of the reaction do not contribute to the termination of the induction period.

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