Comparisons of Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry

Kong, Song‐Charng; Kim, Hoojoong; Reitz, Rolf D.; Kim, Yongmo

doi:10.1115/ices2005-1010

Cited by 11 publications

(3 citation statements)

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“…The cylindrical mesh is finer near the injector for fuel spray simulations. The present mesh resolution is considered to be adequate for engine modelling and has been used in RANS simulations in previous studies [20,30]. A mesh sensitivity study of using the present LES model also shows that the predicted global properties, i.e.…”

Section: Resultsmentioning

confidence: 84%

Diesel combustion modelling using LES turbulence model with detailed chemistry

Kong

2008

Combustion Theory and Modelling

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Diesel spray combustion and emissions are modelled in this study using large eddy simulation (LES) turbulence models coupled with spray breakup and detailed chemistry models. The objective of this study is to develop numerical models that can be used to predict the diesel spray combustion process. The LES filtering procedure yields unknown subgrid scale terms that need to be modelled. A one-equation, non-viscosity dynamic structure model is used to model the subgrid stress tensor and the gradient method is used to model the subgrid scalar flux. The model uses a tensor coefficient determined by a dynamic procedure and the sub-grid kinetic energy that is to enforce a budget on the energy flow between the resolved and unresolved scales. A skeletal n-heptane reaction mechanism is used to simulate the diesel fuel chemistry. A reduced NO x mechanism is incorporated into the n-heptane mechanism to simulate NO x formation, and the soot emission process is simulated by a phenomenological model that uses a competing formation and oxidation rate formulation. The present models were validated by comparing predicted results against experimental data of a diesel engine. The predicted and measured cylinder pressure history and heat release rate data are in good agreement. Trends of NO x and soot emissions are also captured with respect to different injection timings and exhaust gas recirculation (EGR) levels. Results indicated that the present models can capture the overall combustion process and can be further developed into a useful tool for engine combustion simulations.

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Section: Resultsmentioning

confidence: 84%

Diesel combustion modelling using LES turbulence model with detailed chemistry

Kong

2008

Combustion Theory and Modelling

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“…The Arrhenius formulation based on a detailed mechanism is often called a Chemkin approach because the mechanism typically follows the Chemkin input format and is solved by the Chemkin solution procedure. This approach has been used to predict homogeneous charge compression ignition (HCCI) combustion (Kong et al, 2005;Li and Kong, 2008). The Chemkin approach is predictive over the entire phase of HCCI combustion (Kong et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

A Mixed-Mode Combustion Model for Large-Eddy Simulation of Diesel Engines

Hu¹,

Rutland²,

Shethaji³

2010

Combustion Science and Technology

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Present technologies of diesel engine combustion involve various operating conditions that can lead to a broad spectrum of combustion regimes. Existing combustion models for diesel engines usually lack universality across combustion regimes. In this study, a mixed-mode combustion model was developed to cover the major regimes pertaining to diesel engine combustion. The model uses kinetically controlled, quasi-steady homogeneous, quasi-steady flamelet, and partially premixed combustion modes. The combustion regime is identified locally by two combustion indices based on the local chemical and mixing conditions. The combustion model takes advantage of mixing details provided by large-eddy simulation. The model was tested over a wide range of engine conditions including conventional diesel-type and low-temperature combustion operating conditions. The model results compared well with experimental data and exhibited strength in both universality and computational efficiency.

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“…Another term that requires a closure model is the mean burning rate, Other closure models for turbulent combustion are also developed, such as eddy dissipation model [7], RIF model [8], Shell model [9], and characteristic time scale model [9].…”

Section: Combustion Modelingmentioning

confidence: 99%

Numerical modeling of pollutant emissions in practical combustion systems using detailed chemical kinetics

Sukumaran

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Comparisons of Combustion Simulations Using a Representative Interactive Flamelet Model and Direct Integration of CFD With Detailed Chemistry

Cited by 11 publications

References 0 publications

Diesel combustion modelling using LES turbulence model with detailed chemistry

Diesel combustion modelling using LES turbulence model with detailed chemistry

A Mixed-Mode Combustion Model for Large-Eddy Simulation of Diesel Engines

Numerical modeling of pollutant emissions in practical combustion systems using detailed chemical kinetics

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