Experimental validation of concentration profiles in an HCCI engine, modelled by a multi-component kinetic mechanism: Outline for auto-ignition and emission control

Abstract

In order to contribute to the auto-ignition and emission control for Homogeneous Charge Compression Ignition (HCCI), a kinetic multi-component mechanism, containing 62 reactions and 49 species for mixtures of n-heptane, iso-octane and toluene is validated in this work, comparing for the concentration profiles of the fuel, the total hydrocarbons, O 2 , CO 2 , CO, acetaldehyde and iso-butene. These species are sampled during the combustion and quantified. For these measurements an automotive exhaust analyser, a gas chromatograph, coupled to a mass spectrometer and a flame ionisation detector are used, depending on the species to be measured. The fuel, total hydrocarbons, O 2 , CO 2 , iso-butene and acetaldehyde showed a satisfactory quantitative agreement between the mechanism and the experiments.Both the experiments and the modelling results showed the same formation behaviour of the different species. An example is shown of how such a validated mechanism can provide for a set of information of the behaviour of the auto-ignition process and the emission control as a function of engine parameters.2

Product Detection of the CH Radical Reaction with Acetaldehyde

“…16 In combustion environments, carbonyl compounds are wellestablished intermediates. 7 Carbonyl chemistry also plays a major role in the conversion of biofuels and biomass molecules into usable energy. 17,18 In the interstellar medium, carbonyl compounds such as formaldehyde, 13 acetaldehyde, 15 and formic acid 19 are detected in dense interstellar clouds and contribute to the chemical complexity of these environments.…”

Kinetic modeling of polycyclic aromatic hydrocarbons formation process for gasoline surrogate fuels

“…However, it is very difficult to build the real gasoline fuel mechanism, many authors use surrogates to represent the real fuel [11][12][13][14]. Among these surrogates, toluene reference fuel (TRF) including n-heptane, iso-octane and toluene can be regarded as the representative gasoline surrogate fuels.…”

Generation and Analysis for a Skeletal Chemical Kinetic Model of IC₈H₁₈ with Nitric Oxide in HCCI Combustion

“…Studies have been conducted to overcome these difficulties, and advanced technologies have been applied to control HCCI combustion. For example, exhaust gas recirculation (EGR), including external EGR and internal EGR, has been extensively investigated as a means to modify inlet temperature and control ignition delay of gasolineand diesel-fueled HCCI combustion [1][2][3][4][5][6][7][8][9][10] . Moreover, internal EGR can be applied effectively to achieve HCCI combustion in a variable valve structure.…”

“…EGR has drawn attention to research HCCI. The effects of EGR on HCCI combustion can be divided into four parts: a dilution effect, a thermal effect, a heat capacity effect, and a chemical effect [1][2][3][4][5][6][7][8][9] . The dilution, thermal, and heat capacity effects can be analyzed by thermodynamics, whereas the chemical effect can be analyzed by chemical kinetics.…”

“…The dilution, thermal, and heat capacity effects can be analyzed by thermodynamics, whereas the chemical effect can be analyzed by chemical kinetics. With several studies on HCCI combustion, the chemical effect drew more attention because its chemical kinetic mechanism is the key in controlling HCCI combustion [1][2][3][4] . EGR mainly includes active gases, such as carbon monoxide (CO) and nitrogen oxide (NO), carrying out the chemical effect.…”