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ISSN Печать: 1044-5110
ISSN Онлайн: 1936-2684
Indexed in
LARGE EDDY SIMULATION OF HIGH GAS DENSITY EFFECTS IN FUEL SPRAYS
Краткое описание
The paper focuses on the physics of sprays using large eddy simulation (LES) and Lagrangian particle tracking (LPT). The LES/LPT was compared to previously unpublished experimental fuel spray data in two ambient gas densities, 39 and 115 kg/m3. The higher density case corresponds to a near-future engine environment with maximum cylinder pressure of the order of 300 bar, whereas the lower density case resembles typical present-day engine conditions. The accuracy of the results was quantified by calculating the resolved part of the turbulent kinetic energy and using a LES quality index analysis. The sprays produced by the LES/LPT had many similarities with the experimental sprays. On a global scale, spray penetration, spray opening angle, and spray dispersion were found to be well captured by the LES/LPT. The results indicated that the effect of subgrid scales on particle dispersion was small and hence no explicit particle dispersion model was required. Similarities were also found locally as LES/LPT produced small-scale flow structures indicated by the Q-criterion, preferential concentrations, and voids free of droplets. Finally, we propose a new gas phase mixing indicator in order to quantify turbulent mixing. Results from the novel mixing indicator suggest that for a given spray penetration, the higher ambient gas density spray yields an increased mixing rate.
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Yousefifard Mahdi, Ghadimi Parviz, Nowruzi Hashem, Three-dimensional LES modeling of induced gas motion under the influence of injection pressure and ambient density in an ultrahigh-pressure diesel injector, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 37, 4, 2015. Crossref
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Ghiji M., Goldsworthy L., Brandner P.A., Garaniya V., Hield P., Analysis of diesel spray dynamics using a compressible Eulerian/VOF/LES model and microscopic shadowgraphy, Fuel, 188, 2017. Crossref
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Kaario Ossi Tapani, Vuorinen Ville, Zhu Lei, Larmi Martti, Liu Ronghou, Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach, Energy, 120, 2017. Crossref
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Imperato Matteo, Kaario Ossi, Sarjovaara Teemu, Larmi Martti, Influence of the in-cylinder gas density and fuel injection pressure on the combustion characteristics in a large-bore diesel engine, International Journal of Engine Research, 17, 5, 2016. Crossref
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Kaario Ossi Tapani, Vuorinen Ville, Kahila Heikki, Im Hong G, Larmi Martti, The effect of fuel on high velocity evaporating fuel sprays: Large-Eddy simulation of Spray A with various fuels, International Journal of Engine Research, 21, 1, 2020. Crossref
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Gadalla Mahmoud, Kannan Jeevananthan, Tekgül Bulut, Karimkashi Shervin, Kaario Ossi, Vuorinen Ville, Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions, Energies, 13, 13, 2020. Crossref
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Yang Mian, Yuan Chenheng, Chen Yuanpei, Shao Yiming, Numerical study on turbulent dispersion of diesel sprays under ultrahigh injection pressure using large eddy simulation, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020. Crossref
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