Effects of Soret diffusion on premixed flame propagation under engine-relevant conditions

Faghih, Mahdi; Han, Wang; Chen, Zheng

doi:10.1016/j.combustflame.2018.04.031

Cited by 21 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is necessary to recycle the exhaust gases in the combustible gas results in remarkably changing the fundamental flame properties, including the laminar flame speed, adiabatic flame temperature and flame structure [40,41], and thereby affecting the pollution emissions formation [42]. The chemical effect of the CO2 dilution gas produced the greatest impacts on the laminar flame speed, adiabatic combustion temperature and key radicals formation of the methane/air [43].…”

Section: Introductionmentioning

confidence: 99%

Study of the Combustion Process of a Homogeneous Charge Compression Ignition (HCCI) Engine and a Partially Premixed Combustion (PPC) Mode of a Compression Ignition Engine Using Natural Gas as an Alternative Fuel

Belkebir

Khelidj

Tahar-Abbes

2021

ARFMTS

View full text Add to dashboard Cite

In order to investigate a viable approach to achieving high efficiencies and low nitrogen oxide (NOX) emissions, this paper presents the application of a homogeneous charge compression ignition (HCCI) engine and the partially premixed combustion (PPC) mode applied to a heavy diesel engine. The effect of carbon dioxide (CO2) fraction on combustion parameters was analyzed and discussed in detail. For this purpose, on the one hand, ANSYS CHEMKIN-Pro software was used to perform simulations of a closed homogeneous reactor under conditions relevant to HCCI engines, and on the other hand, ANSYS-Fluent software was used by adding a CO2 fraction varying from 20% to 58% to methane fuel to study 2D flow simulation by applying a PPC combustion mode to predict the distribution of various output parameters such as in-cylinder temperature, in-cylinder pressure and emissions. In comparison with the two presented models, it was found that the HCCI engine showed a lower NOX level than the PPC mode and this was due to the lower in-cylinder temperature in the HCCI engine.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the Combustion Process of a Homogeneous Charge Compression Ignition (HCCI) Engine and a Partially Premixed Combustion (PPC) Mode of a Compression Ignition Engine Using Natural Gas as an Alternative Fuel

Belkebir

Khelidj

Tahar-Abbes

2021

ARFMTS

View full text Add to dashboard Cite

show abstract

“…While data from three-dimensional reacting-flow simulations with multicomponent transport are sparse, several groups have investigated the effects of multicomponent transport in simpler configurations. These studies include one-dimensional [7][8][9][10][11][12] and two-dimensional flames [13][14][15] at various unburnt conditions. These works compared the multicomponent model with various levels of diffusion and transport property models, from constant Lewis num-ber to mixture-averaged properties.…”

Section: Introductionmentioning

confidence: 99%

A fast, low-memory, and stable algorithm for implementing multicomponent transport in direct numerical simulations

Fillo

Schlup

Beardsell

et al. 2020

Journal of Computational Physics

View full text Add to dashboard Cite

Implementing multicomponent diffusion models in reacting-flow simulations is computationally expensive due to the challenges involved in calculating diffusion coefficients. Instead, mixture-averaged diffusion treatments are typically used to avoid these costs. However, to our knowledge, the accuracy and appropriateness of the mixture-averaged diffusion models has not been verified for three-dimensional turbulent premixed flames. In this study we propose a fast, efficient, low-memory algorithm and use that to evaluate the role of multicomponent mass diffusion in reacting-flow simulations. Direct numerical simulation of these flames is performed by implementing the Stefan-Maxwell equations in NGA. A semi-implicit algorithm decreases the computational expense of inverting the full multicomponent ordinary diffusion array while maintaining accuracy and fidelity. We demonstrate the algorithm to be stable, and its performance scales approximately with the number of species squared. We first verify the method by performing one-dimensional simulations of premixed hydrogen flames and compare with matching cases in Cantera. As an initial study of multicomponent diffusion, we simulate premixed, three-dimensional turbulent hydrogen flames, neglecting secondary Soret and Dufour effects. Simulation conditions are carefully selected to match previously published results and ensure valid comparison. Our results show that using the mixture-averaged diffusion assumption lead to a 15 % under-prediction of the normalized turbulent flame speed for premixed hydrogen air flames. This large difference in the turbulent flame speed raises questions on the appropriateness of using the mixture-averaged diffusion assumption for DNS of moderate to high Karlovitz number flames.

show abstract

“…The Soret effect for hydrogen premixed flames have been extensively studied at atmospheric conditions [2,4,5] while few studies have considered elevated pressures and temperatures. A recent study by [6] focused on the impact of Soret effect on onedimensional hydrogen air flames at elevated temperature and pressure of 800 K and 18 bar. They showed that at higher temperatures, a significant decrease of the laminar flame speed is observed by including the Soret effect.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation of hydrogen combustion: Impact of Soret effect

Manzoor¹,

Yosri²,

Poursadegh³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

View full text Add to dashboard Cite

Due to the relatively high diffusivity of hydrogen, flame propagation properties such as the laminar flame speed is more influenced by the mass diffusion induced by high temperature gradients, a phenomenon known as Soret effect. Three-dimensional (3D) simulations of hydrogen combustion in a Cooperative Fuel Research (CFR) engine is conducted to study the influence of Soret effect. Large-Eddy Simulation (LES) is used to capture the in-cylinder flow field while the G-equation model is used to track flame propagation. The effects of using the mixture averaged approximation with and without Soret effect on flame propagation is examined. It is observed that including the Soret effect leads to a decrease in the laminar flame speed and consequently results in delayed combustion with lower peak cylinder pressure.

show abstract

Effects of Soret diffusion on premixed flame propagation under engine-relevant conditions

Cited by 21 publications

References 32 publications

Study of the Combustion Process of a Homogeneous Charge Compression Ignition (HCCI) Engine and a Partially Premixed Combustion (PPC) Mode of a Compression Ignition Engine Using Natural Gas as an Alternative Fuel

Study of the Combustion Process of a Homogeneous Charge Compression Ignition (HCCI) Engine and a Partially Premixed Combustion (PPC) Mode of a Compression Ignition Engine Using Natural Gas as an Alternative Fuel

A fast, low-memory, and stable algorithm for implementing multicomponent transport in direct numerical simulations

Large-eddy simulation of hydrogen combustion: Impact of Soret effect

Contact Info

Product

Resources

About