Detailed numerical simulation of transient mixing and combustion of premixed methane/air mixtures in a pre-chamber/main-chamber system relevant to internal combustion engines

Qin, Fei; Shah, Ashish; Huang, Zhi Wei; Li-na, Peng; Tunestål, Per; Bai, Xue‐Song

doi:10.1016/j.combustflame.2017.10.006

Cited by 94 publications

(32 citation statements)

References 29 publications

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“…Direct numerical simulation (DNS) -typically limited to low-to-moderate Reynolds number flows -can potentially provide this fine-grained information for model development. Preliminary DNS works related to pre-chamber combustion system started to arise [2,3] and can be expected to play an important role on the future model development process. To date, however, validation of CFD models is typically performed by means of global heat release rate and qualitative optical diagnostics such as schlieren imaging and OH* chemiluminescence (e.g.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Pre-Chamber Combustion in an Optically Accessible RCEM

Bolla¹,

Shapiro²,

Tiney³

et al. 2019

SAE Technical Paper Series

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In this work, numerical simulations of an automotive-sized scavenged pre-chamber mounted in an optically-accessible rapid compressionexpansion machine (RCEM) have been carried out using two different turbulence models: Reynolds-Averaged Navier-Stokes (RANS) and Large-Eddy Simulation (LES). The RANS approach is combined with the G-equation combustion model, whereas the LES approach is coupled with the flamelet generated manifold (FGM) model for partially-premixed combustion. Simulation results are compared with experimental data in terms of OH* chemiluminescence in the main chamber. Both RANS and LES results were found to qualitatively reproduce the main features observed experimentally in terms of spatial flame development. Simulation results are further analysed by means of early flame propagation within the pre-chamber (related to the fuel and turbulence intensity distributions) and the ignition process in the main chamber. During the turbulence jet ignition (TJI) process, the analysis of the LES progress variable variance reveals that during the intensive jet mixing the mixture in the main chamber is predominantly ignited by autoignition followed by a progressive transition to a deflagrative premixed flame propagation mode. For the lean fuel-air mixture considered (=2) the mixing of the additional fuel (previously injected into the pre-chamber) within the main chamber was found to play a major role on the ignition process.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Pre-Chamber Combustion in an Optically Accessible RCEM

Bolla¹,

Shapiro²,

Tiney³

et al. 2019

SAE Technical Paper Series

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“…However, the time step used in the current LES is 80 ns, which is assumed to ensure a sufficient resolution for the operator splitting throughout the unsteady ignition problem. Similar splitting techniques with relatively small time steps have been previously applied in turbulent combustion context with successful validation against the DNS [180,181] and experimental [182,183] data.…”

Section: Flow Solvermentioning

confidence: 99%

Comparative study on chemical kinetic schemes for dual-fuel combustion of n-dodecane/methane blends

Masouleh

Wehrfritz

Kaario

et al. 2017

Fuel

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“…Numerical simulations of TJI have been limited in RANS (Xu et al 2017(Xu et al , 2018Chinnathambi et al 2015;Gentz et al 2015b;Thelen et al 2015;Thelen and Toulson 2017;Wang et al 2018), Large Eddy Simulations (LES) (Validi et al 2017;Feyz et al 2019a;Malé et al 2019) and more recently Direct Numerical Simulations (DNS) (Validi and Jaberi 2018;Qin et al 2018;Benekos et al 2020). Although some preliminary lower-order modelling efforts were focused on capturing the mass entrainment rate and temporal evolution of the temperature profile in suddenly started jets (Feyz et al 2019b(Feyz et al , 2018, with the scope of extending the model to ignition delay prediction, a formally derived and validated low-order ignition model for TJI is missing from the existing literature.…”

Section: Introductionmentioning

confidence: 99%

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

Bardis

Kyrtatos²,

Barro

et al. 2021

Flow Turbulence Combust

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Turbulent jet ignition (TJI) is a promising combustion technology for burning highly diluted air-fuel mixtures. Computationally efficient models to assess the effect of the operating conditions and design parameters on the ignition propensity and timing are of paramount importance for the development of combustion systems employing TJI. To this end, a one-dimensional (1-D) jet model, which is based on the solution of the section integrated mass and momentum conservation equations, is derived in the present study. The model is extended with two additional transport equations for the turbulence intensity and the ignition precursor/tracer, that marks the ignition event. One-dimensional transient flamelet calculations are performed to generate tables for the ignition precursor source term that account for the turbulence and chemistry interaction. Further simplification of the model is carried out to obtain a novel penetration correlation and a computationally inexpensive Lagrangian ignition model. The extended jet model is hierarchically validated using available literature data for non-reactive and reactive jets, as well as experiments conducted in a state-of-the-art optically accessible prechamber. The derived model is able to reproduce both flow-related quantities (velocity and turbulence profiles, jet penetration) and the ignition delay time under different variations. This study also illustrates how numerical simulations in canonical configurations (one-dimensional flamelet) can be used in practical applications of TJI.

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Detailed numerical simulation of transient mixing and combustion of premixed methane/air mixtures in a pre-chamber/main-chamber system relevant to internal combustion engines

Cited by 94 publications

References 29 publications

Numerical Simulations of Pre-Chamber Combustion in an Optically Accessible RCEM

Numerical Simulations of Pre-Chamber Combustion in an Optically Accessible RCEM

Comparative study on chemical kinetic schemes for dual-fuel combustion of n-dodecane/methane blends

A Novel One- and Zero-Dimensional Model for Turbulent Jet Ignition

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