Fuel-air mixing in motored CFR engine at research octane number (RON) relevant condition
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-04
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Language
en
Pages
16
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International Journal of Engine Research, Volume 25, issue 4, pp. 727-742
Abstract
This paper presents a three-dimensional (3-D) computational fluid dynamics (CFD) study of a motored cooperative fuel research (CFR) engine at research octane number (RON) relevant condition. The boundary conditions for 3-D simulations were generated with a one-dimensional GT-Power model. For the first time in literature, a carburetor was added to a virtual CFR engine model with 3-D CFD. Therefore, the proposed setup can simulate the fuel and thermal stratifications inside the engine cylinder with realistic detail. The transient simulations in this work were performed within the Reynolds-averaged Navier-Stokes (RANS) framework with a Realizable k-ε turbulence model. Major conclusions from the present work are: (1) The in-cylinder flow of the CFR engine is swirl-dominated due to the existence of the intake valve shroud. (2) There is a significant amount of liquid droplets entering the cylinder during the intake stroke. The maximum instantaneous amount of liquid for 50% PRF 87 (containing 87% iso-octane and 13% n-heptane (v/v)) and 50% ethanol mixture is indicated to be around 26% of total injected fuel mass. (3) The heat of vaporization (HoV) of the fuel is responsible for creating both temperature and charge stratification inside the cylinder.Description
Funding Information: The authors acknowledge the computational resources provided by the Aalto Science-IT project and Aalto Research Software Engineers (RSEs). We thank Olli Ranta and Otto Blomstedt for assistance. The submitted manuscript was created partly by UChicago Argonne, LLC, Operator of Argonne National Laboratory. Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. Funding Information: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study is financially supported by the Research Council of Finland (grant no. 346918 and 332835). Financial support from Neste Oy is gratefully acknowledged. Publisher Copyright: © IMechE 2023.
Keywords
computational fluid dynamics, cooperative fuel research (CFR) engine, ethanol, Gasoline combustion knock, research octane number
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Citation
Bhattacharya, A, Keskinen, K, Larmi, M, Pal, P, Kroyan, Y, Sarjovaara, T & Kaario, O 2024, ' Fuel-air mixing in motored CFR engine at research octane number (RON) relevant condition ', International Journal of Engine Research, vol. 25, no. 4, pp. 727-742 . https://doi.org/10.1177/14680874231206198
