PIC formation during the combustion of simple hydrocarbons in inhomogeneous incineration systems

Procaccini, Carlo; Kraft, Markus; Fey, Harald; Bockhorn, Henning; Longwell, John P.; Sarofim, Adel F.; Smith, Kenneth A.

doi:10.1016/s0082-0784(98)80531-6

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The purpose of this paper is to introduce a new simulation model featuring the partially stirred plug flow reactor (PaSPFR) as described in refs. [3] [4]. Numerical simulations of the ignition process in the HCCI engine will be performed using a detailed chemical model for butane and lower alkanes in the framework of the PaSPFR.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous Charge Compression Ignition Engine: A Simulation Study on the Effects of Inhomogeneities

Maigaard

Mauß

Kraft

2003

Journal of Engineering for Gas Turbines and Power

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A stochastic model for the HCCI engine is presented. The model is based on the PaSPFR-IEM model and accounts for inhomogeneities in the combustion chamber while including a detailed chemical model for natural gas combustion, consisting of 53 chemical species and 590 elementary chemical reactions. The model is able to take any type of inhomogeneities in the initial gas composition into account, such as inhomogeneities in the temperature field, in the air-fuel ratio or in the concentration of the recirculated exhaust gas. With this model the effect of temperature differences caused by the thermal boundary layer and crevices in the cylinder for a particular engine speed and fuel to air ratio is studied. The boundary layer is divided into a viscous sublayer and a turbulent buffer zone. There are also colder zones due to crevices. All zones are modeled by a characteristic temperature distribution. The simulation results are compared with experiments and a previous numerical study employing a PFR model. In all cases the PaSPFR-IEM model leads to a better agreement between simulations and experiment for temperature and pressure. In addition a sensitivity study on the effect of different intensities of turbulent mixing on the combustion is performed. This study reveals that the ignition delay is a function of turbulent mixing of the hot bulk and the colder boundary layer.

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Section: Introductionmentioning

confidence: 99%

Homogeneous Charge Compression Ignition Engine: A Simulation Study on the Effects of Inhomogeneities

Maigaard

Mauß

Kraft

2003

Journal of Engineering for Gas Turbines and Power

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“…Models which are based on this assumption are often called partially stirred reactor models. Such partially stirred models have been used, for example, in [7] to study combustion of methane, in [6,5] to model the formation of NOx and in [22,14] to model a stationary combustion device and an internal combustion engine. An overview on this sort of models can be found in [12].…”

Section: Introductionmentioning

confidence: 99%

An efficient stochastic chemistry approximation for the PDF transport equation

Kraft¹,

Wagner²

2002

Monte Carlo Methods and Applications

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In this paper we present an efficient algorithm for the numerical treatment of the PDF transport equation. Using the partially stirred plug flow model in conjunction with the IBM mixing model we construct a numerical scheme that is based on a time Splitting technique and a stochastic chemistry approximation. For this purpose a particle/sub-particle System is introduced. The dynamics of this particle System is determined by a mixing step and a chemistry step. The chemistry step is solved by a Jump process where forward and reverse reactions are combined. Various numerical experiments are carried out to study convergence with respect to particle number and sub-particle number. In case of a linear reaction, the comparison between analytical solution and numerical approximation of the third moment reveals that the systematic error is inversely proportional to the number of particles and sub-particles, respectively. The performance of the algorithm is evaluated by studying the combustion of a premixed stoichiometric mixture of n-heptane and air. The stochastic chemistry algorithm is compared with a deterministic approach using the ODE solver DASSL and it is found, for the examples studied, that the stochastic algorithm is more efficient than the deterministic approach.

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“…In [14], soot formation in a diesel engine was modeled using a SRM which included a detailed model for soot formation combined with a reduced gas phase mechanism. In [15], an experimental and a computational study of the influence of turbulence intensity on the formation of products of incomplete combustion in a stationary turbulent flow reactor has been presented. Good agreement between experiments and simulation results has been achieved.…”

Section: Introductionmentioning

confidence: 99%

Some analytic solutions for stochastic reactor models based on the joint composition PDF

Kraft

Fey

1999

Combustion Theory and Modelling

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The stochastic reactor models Partially Stirred Reactor (PaSR) and Partially Stirred Plug Flow Reactor (PaSPFR) have been investigated. These models are based on a simplified joint composition PDF transport equation. Analytic solutions for five different Cauchy problems for the PDF transport equation as given by the stochastic reactor models are presented. In all cases, molecular mixing in the stochastic reactor models is described by the LMSE mixing model. The analytic solutions have been found by combining the method of characteristics with a set of ordinary differential equations for the statistical moments to account for the functional dependence of the coefficients in the corresponding PDF transport equation. For each case an example problem is discussed to illustrate the behavior of the analytic solution.

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PIC formation during the combustion of simple hydrocarbons in inhomogeneous incineration systems

Cited by 6 publications

References 11 publications

Homogeneous Charge Compression Ignition Engine: A Simulation Study on the Effects of Inhomogeneities

Homogeneous Charge Compression Ignition Engine: A Simulation Study on the Effects of Inhomogeneities

An efficient stochastic chemistry approximation for the PDF transport equation

Some analytic solutions for stochastic reactor models based on the joint composition PDF

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