Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
Indexed in
EVALUATION OF TURBULENCE-CHEMISTRY INTERACTION UNDER DIESEL ENGINE CONDITIONS WITH MULTI-FLAMELET RIF MODEL
ABSTRACT
The multi-flamelet representative interactive flamelet (RIF) model is used to account for the effects of turbulence-chemistry interaction (TCI) to model spray combustion under typical diesel engine conditions. The RIF model calculates the species mass fraction based on the mixture fraction fields and scalar dissipation rates provided by the computational fluid dynamics solver. A time-dependent renormalization group turbulence model is used in conjunction with a grid-converged discrete phase model for the liquid phase. The minimum number of flamelets required is determined to sufficiently represent the large variation of stoichiometric scalar dissipation rates in the domain. Different forms of the presumed scalar probability density functions (PDFs) were also examined. The modeling results are then compared with the experimental data at different ambient temperatures, ambient O2 concentrations, ambient densities, and injection pressures. The effects of different chemical kinetic mechanisms (103-species and 106-species skeletal mechanisms) are also studied to further understand the performance of the model. Overall, the RIF model is observed to capture the measured ignition delay and flame lift-off length very well, especially under certain conditions characterized by low ambient temperatures, densities, and oxygen concentrations. The need for initializing multiple flamelets is highlighted in order to obtain simulation results devoid of modeling artifacts. Overall, the efficacy of using an advanced turbulence combustion model is demonstrated.
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Moiz Ahmed Abdul, Som Sibendu, Bravo Luis, Lee Seong-Young, Experimental and Numerical Studies on Combustion Model Selection for Split Injection Spray Combustion, SAE Technical Paper Series, 1, 2015. Crossref
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Maes Noud, Dam Nico, Somers Bart, Lucchini Tommaso, D'Errico Gianluca, Hardy Gilles, Heavy-Duty Diesel Engine Spray Combustion Processes: Experiments and Numerical Simulations, SAE Technical Paper Series, 1, 2018. Crossref
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Chishty Muhammad A., Bolla Michele, Hawkes Evatt R., Pei Yuanjiang, Kook Sanghoon, Soot formation modelling for n-dodecane sprays using the transported PDF model, Combustion and Flame, 192, 2018. Crossref
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Pei Yuanjiang, Pal Pinaki, Zhang Yu, Traver Michael, Cleary David, Futterer Carsten, Brenner Mattia, Probst Daniel, Som Sibendu, CFD-Guided Combustion System Optimization of a Gasoline Range Fuel in a Heavy-Duty Compression Ignition Engine Using Automatic Piston Geometry Generation and a Supercomputer, SAE Technical Paper Series, 1, 2019. Crossref
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Pei Yuanjiang, Hu Bing, Som Sibendu, Large-Eddy Simulation of an n-Dodecane Spray Flame Under Different Ambient Oxygen Conditions, Journal of Energy Resources Technology, 138, 3, 2016. Crossref
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Pei Yuanjiang, Mehl Marco, Liu Wei, Lu Tianfeng, Pitz William J., Som Sibendu, A Multicomponent Blend as a Diesel Fuel Surrogate for Compression Ignition Engine Applications, Journal of Engineering for Gas Turbines and Power, 137, 11, 2015. Crossref
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Zhang Yan, Wang Hu, Both Ambrus, Ma Likun, Yao Mingfa, Effects of turbulence-chemistry interactions on auto-ignition and flame structure for n-dodecane spray combustion, Combustion Theory and Modelling, 23, 5, 2019. Crossref
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