Assessment of a Multi Zone Combustion Model for Analysis and Prediction of CI Engine Combustion and Emissions

Poetsch, Christoph; Ofner, Herwig; Schutting, Eberhard

doi:10.4271/2011-01-1439

Cited by 26 publications

(10 citation statements)

References 20 publications

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“…The main advantage of multi-zone models over computational fluid dynamics (CFD) tools is that more detailed chemical mechanisms can be applied directly. Therefore multi-zone modeling has been applied extensively in engine community [8][9][10][11][12][13][14][15][16]. In those studies, the complex flow phenomena are ignored.…”

Section: Introductionmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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Premixed charge compression ignition (PCCI) is a clean and efficient alternative for classical diesel combustion. The concept of PCCI combustion is associated with early injection of the fuel whilst applying high exhaust gas recirculation (EGR) levels and operation with a highly lean mixture such that ignition takes place (well) after the injection event. Thus, it is possible to reduce soot and oxides of nitrogen (NO x ) emissions simultaneously. PCCI combustion is analyzed using a multi-zone model. In the multi-zone model, chemical mechanisms which are much more detailed compared to those used in computational fluid dynamics (CFD) approaches can be introduced directly. The CFD model is still used to predict the initial fuel stratification in the cylinder which is important to improve the quality of the model. For the analysis, dedicated experiments with n-heptane are used to evaluate the results of the model. In such a multi-zone model, 10 zones prove to be sufficient to describe the stratification with adequate resolution. It is observed that different fuel distributions have a large influence on the emissions when there is no mixing between the zones. To overcome this dependence, a basic inter-zonal diffusive 2 mixing is applied. The level of mixing is estimated with a sensitivity study. When the inter-zonal mixing is included, emission results become much less sensitive to the crank angle (CA) at which the charge stratification is sampled and the simulation is initialized.

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Section: Introductionmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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“…, 3 and K 4 in the equations from (1) to (14) are substitutes for differential expressions, and marks S 1 , S 2 are the replacement for the sums that need to be inserted into the equation for the pressure change (16). The index i is an index for any observed volume (for each package of each fuel spray as well as for the zone without combustion).…”

Section: Mathematical Model and Agglomeration Process 21 Mathematicamentioning

confidence: 99%

“…At the end, these quasi-dimensional models are trying to improve modelling by using the principle that combustion products from spray packages are transferred into the zone without combustion. They are there mixed with the existing air and moved back into packages [16], [17].…”

Section: Introductionmentioning

confidence: 99%

Quasi-dimensional diesel engine model with direct calculation of cylinder temperature and pressure

2017

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Original scientific paper This paper describes the quasi-dimensional numerical model, implemented in previously developed 0D model. The presented model uses direct solution of equations for cylinder pressure and zone temperatures, without numerical iterations which are customary for these models. In the model there is shown a process of averaging from a set of small fuel spray packages (volumes) into big ones, which is a necessary precondition for the numerical stability. The model uses about fifty submodels. Simulations were performed in eight operating points, on four most sensitive engine cylinder operating parameters. Direct solution of temperature and pressure changes, in conjunction with the fuel spray packages averaging, represents a contribution to quasi-dimensional diesel engine process modelling. Keywords: combustion; diesel engine; emissions; fuel spray; quasi-dimensional (phenomenological) model Kvazi-dimenzijski model dizelskog motora s direktnim izračunom tlaka i temperature u cilindruIzvorni znanstveni članak U ovom radu prikazan je kvazi-dimenzijski numerički model, implementiran u prethodno razvijeni 0D model. Prikazani model koristi direktan izračun jednadžbi za prirast tlaka i temperatura zona u cilindru, bez upotrebe numeričkih iteracija koje su uobičajene za ove modele. U modelu je prikazan proces usrednjavanja iz seta malih paketa (volumena) mlaza goriva u veliki paket, što je nužna pretpostavka numeričke stabilnosti modela. Model koristi oko pedeset podmodela. Simulacije su provedene za četiri najosjetljivija radna parametra u cilindru motora. Direktno rješavanje jednadžbi prirasta tlaka i temperature u cilindru, u kombinaciji sa usrednjavanjem paketa mlaza goriva, predstavlja doprinos u kvazi-dimenzijskom modeliranju procesa u dizelskom motoru.

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“…One of the proposed improvements is the principle that parts of combustion products from spray packages are transferred into the zone without combustion. They are mixed with air and moved back into the packages [15], [16].…”

Section: Fig 1 Fuel Spray Divided Into Packages (Volumes)mentioning

confidence: 99%

Simulation of a Two-Stroke Slow Speed Diesel Engine Using a Quasi-Dimensional Model

2016

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SummaryThe paper describes a diesel engine quasi-dimensional numerical model, implemented in a previously developed 0D model. The presented model uses direct solution to the conservation equations set for cylinder pressure and zone temperatures without numerical iterations which are customary in these models. Numerical model validation was performed on a four-stroke diesel engine at four operating points. After successful validation, modifications were implemented in the numerical model allowing the simulation of a marine two-stroke diesel engine. It is important to emphasize that the simulation model logic remained unchanged. The only significant differences are the changes in the engine working processes and different calculation of the engine operating parameters which are characteristic of two-stroke engines. The results of the diesel engine simulations using the quasidimensional model were compared to the test-bed measurements of the two-stroke engine found in available literature. Good agreement between the measurements and the simulation results for the two-stroke engine has been obtained. The developed quasi-dimensional numerical model can accurately predict operating parameters of the four-stroke and the twostroke diesel engine.

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Assessment of a Multi Zone Combustion Model for Analysis and Prediction of CI Engine Combustion and Emissions

Cited by 26 publications

References 20 publications

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Quasi-dimensional diesel engine model with direct calculation of cylinder temperature and pressure

Simulation of a Two-Stroke Slow Speed Diesel Engine Using a Quasi-Dimensional Model

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