Large-Eddy Simulation on the Influence of Injection Pressure in Reacting Spray A

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2018-05
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Mcode
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Language
en
Pages
18
142-159
Series
COMBUSTION AND FLAME, Volume 191
Abstract
The Engine Combustion Network (ECN) Spray A target case corresponds to high-pressure liquid fuel injection in conditions relevant to diesel engines. Following the procedure by Wehrfritz et al. 2016, we utilize large-eddy simulation (LES) and flamelet generated manifold (FGM) methods to carry out an injection pressure sensitivity study for Spray A at 50, 100 and 150 MPa. Comparison with experiments is shown for both non-reacting and reacting conditions. Validation results in non-reacting conditions indicate relatively good agreement between the present LES and experimental data, with some deviationin mixture fraction radial profiles. In reacting conditions, the simulated flame lift-off length (FLOL) increases with injection pressure, deviating from the experiments by 4-14%. The respective deviation in ignition delay time (IDT) is noted to be within 10-20%. Analysis of the underlying chemistry manifold implies that the noted discrepancies can be explained partially by the differences between experimental and computational mixing processes.
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Keywords
LES, FGM, spray A, combustion, ignition, ignition kernels
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Citation
Kahila, H, Wehrfritz, A, Kaario, O, Ghaderi Masouleh, M, Maes, N, Somers, B & Vuorinen, V 2018, ' Large-Eddy Simulation on the Influence of Injection Pressure in Reacting Spray A ', Combustion and Flame, vol. 191, pp. 142-159 . https://doi.org/10.1016/j.combustflame.2018.01.004