Article

1999 ◽  
Vol 77 (7) ◽  
pp. 1177-1190 ◽  
Author(s):  
S Taconnet ◽  
Y Simon ◽  
G Scacchi ◽  
F Baronnet
Keyword(s):  
Experimental Study ◽  
Reaction Mechanisms ◽  
Reaction Medium ◽  
Spark Ignition ◽  
Reaction Vessel ◽  
Spark Ignition Engines ◽  
Flow Reaction ◽  
Oxidation Mechanisms

The different behaviour of hydrocarbons with respect to autoignition phenomena is, at present, not yet fully explained. We have therefore investigated the oxidation of two alkanes that have different octane numbers: neopentane (85.5) and isopentane (92.3), to obtain a better understanding of their reaction mechanisms, in particular, those reactions that are responsible for the onset of knock in spark ignition engines. The experimental study was performed at 873 K in a jet-stirred flow reaction vessel. The oxidation mechanisms were simplified by using the CHEMKIN programme of simulation of reaction mechanisms. These mechanisms were compared to those accounting for the oxidation of n-pentane, cyclopentane, n-heptane, and isooctane that we have previously studied. This comparison shows that the different behaviour of these hydrocarbons can be explained, at least in part, by the presence, in the reaction medium, of resonance-stabilized radicals.Key words: oxidation, neopentane, isopentane, autoignition, modelling.

Étude expérimentale et modélisation des réactions d'oxydation du n-pentane et du cyclopentane

1997 ◽  
Vol 75 (5) ◽  
pp. 575-584 ◽  
Author(s):  
V. Simon ◽  
Y. Simon ◽  
G. Scacchi ◽  
F. Baronnet
Keyword(s):  
Reaction Mechanisms ◽  
Relative Concentration ◽  
Reaction Medium ◽  
Oxidation Mechanism ◽  
Reaction Vessel ◽  
Combustion Mechanism ◽  
Spark Ignition Engines ◽  
Research Octane Number ◽  
Automotive Emissions

The reduction of automotive emissions and the reformulation of gasoline composition require a better understanding of the combustion mechanism, in particular aiming at the determination of the influential reactions which are responsible for the onset of knock in spark ignition engines. We have studied the oxidation mechanism of two hydrocarbons of different research octane number: n-pentane (62) and cyclopentane (100). This work follows a previous study on the oxidation of n-heptane and isooctane. The experimental study was performed at 873 K in a jet-stirred flow reaction vessel. The reaction mechanisms of n-pentane and cyclopentane were analysed on a purely kinetic basis, derived from our experimental results, and were finally modelled by using a programme of simulation of reaction mechanisms. The different behaviour of these two hydrocarbons with respect to autoignition phenomena is mainly dependent on the relative concentration of resonance-stabilized radicals in the reaction medium. Keywords: oxidation reaction, n-pentane, cyclopentane, modelling, autoignition.

Études des réactions d'oxydation du n-heptane et de l'isooctane

1996 ◽  
Vol 74 (7) ◽  
pp. 1391-1402 ◽  
Author(s):  
Yves Simon ◽  
Gérard Scacchi ◽  
François Baronnet
Keyword(s):  
Experimental Study ◽  
Kinetic Analysis ◽  
Key Words ◽  
Reaction Mechanisms ◽  
Oxidation Reaction ◽  
Product Formation ◽  
Chemical Mechanism ◽  
Stirred Reactor ◽  
Oxidation Mechanisms

The oxidation mechanisms of two alkanes that have quite different octane numbers: n-heptane (0) and isooctane (100), were investigated to obtain a better understanding of the chemical mechanism of autoignition phenomena and to improve the compatibility of the available fuels with the engines. The experimental study was performed at 923 K in a setup equipped with a jet-stirred reactor. The oxidation mechanisms of n-heptane and isooctane were simplified first by a purely kinetic analysis based on the product formation and then by using a software of simulation of reaction mechanisms. The very different behaviour of these two hydrocarbons was explained by the presence, in the products of isooctane oxidation, of alkenes, which would have an antiknock effect due to the formation of resonance-stabilized radicals. Key words: oxidation reaction, n-heptane, isooctane, autoignition, modelling.

Theoretical and Experimental Study of the Fuelling a Truck Diesel Engine with Liquefied Petroleum Gas

2016 ◽  
Vol 822 ◽  
pp. 198-205
Author(s):  
Nikolaos Cristian Nutu ◽  
Constantin Pana ◽  
Alexandru Dobre ◽  
Niculae Negurescu ◽  
Alexandru Cernat
Keyword(s):  
Experimental Study ◽  
Diesel Engine ◽  
Spark Ignition ◽  
Experimental Investigations ◽  
Spark Ignition Engines ◽  
Nitric Oxides ◽  
Liquefied Petroleum Gas ◽  
And Storage ◽  
Objective Research ◽  
Engine Power

The increasing price of the fuels and tightening of the pollution rules requires the use of some efficient fuelling methodes with altenative fuels for diesel engines. Fuelling with LPG of a diesel engine is a viable sollution, considering that it can be used the infrastructure for distribution and storage already used for spark ignition engines. In this work are presented results of theoretical and experimental investigations of a truck diesel engine fuelled with LPG by diesel-LPG methode. The main objective research is the decrease of the nitric oxides emissions with the premise that the engine power is maintained at the same level like in the case of the standard engine, fuelled only with diesel fuel.

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