Combustion characteristics and detailed simulations of surrogates for a Tier II gasoline certification fuel

Guo, Songtao; Cuoci, Alberto; Wang, Yujie; Ji, Liang; Avedisian, C. Thomas; Seshadri, Kalyanasundaram; Lopez-Pintor, Dario; Dec, John E.; DiReda, Nicholas; Frassoldati, Alessio

doi:10.1016/j.proci.2022.07.126

Combustion characteristics and detailed simulations of surrogates for a Tier II gasoline certification fuel

Journal Article · Sat Oct 01 00:00:00 EDT 2022 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2022.07.126· OSTI ID:1998036

^[1]; ^[2]; ^[3]; Ji, Liang ^[4]; Avedisian, C. Thomas ^[3]; Seshadri, Kalyanasundaram ^[4]; ^[5]; Dec, John E. ^[5]; DiReda, Nicholas ^[3]; ^[2]

Cornell University, Ithaca, NY (United States); Proceedings of the Combustion Institute
Politecnico di Milano (Italy)
Cornell University, Ithaca, NY (United States)
University of California, San Diego, CA (United States)
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

An experimental and numerical study of combustion of a gasoline certification fuel (‘indolene’), and four (S4) and five (S5) component surrogates for it, is reported for the configurations of an isolated droplet burning with near spherical symmetry in the standard atmosphere, and a single cylinder engine designed for advanced compression ignition of pre-vaporized fuel. The intent was to compare performance of the surrogate for these different combustion configurations and to assess the broader applicability of the kinetic mechanism and property database for the simulations. A kinetic mechanism comprised of 297 species and 16,797 reactions was used in the simulations that included soot formation and evolution, and accounted for unsteady transport, liquid diffusion inside the droplet, radiative heat transfer, and variable properties. The droplet data showed a clear preference for the S5 surrogate in terms of burning rate. The simulations showed generally very good agreement with measured droplet, flame, and soot shell diameters. Measurements of combustion timing, in-cylinder pressure, and mass-averaged gas temperature were also well predicted with a slight preference for the S5 surrogate. Preferential vaporization was not evidenced from the evolution of droplet diameter but was clearly revealed in simulations of the evolution of mixture fractions inside the droplets. Here, the influence of initial droplet diameter (D_o) on droplet burning was strong, with S5 burning rates decreasing with increasing D_o due to increasing radiation losses from the flame. Flame extinction was predicted for D_o =3.0 mm as a radiative loss mechanism but not predicted for smaller D_o for the conditions of the simulations.

View Accepted Manuscript (DOE)

Research Organization:: Cornell University, Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: EE0007978

OSTI ID:: 1998036

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 2 Vol. 39; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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