Efficient two-dimensional simulation of primary reference fuel ignition under engine-relevant thermal stratification
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2023-12-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
26
Series
PHYSICS OF FLUIDS, Volume 35, issue 12
Abstract
Despite vast research on engine knock, there remains a limited understanding of the interaction between reaction front propagation, pressure oscillations, and fuel chemistry. To explore this through computational fluid dynamics, the adoption of advanced numerical methods is necessary. In this context, the current study introduces ARCFoam, a computational framework that combines dynamic mesh balancing, chemistry balancing, and adaptive mesh refinement with an explicit, density-based solver designed for simulating high-speed flows in OpenFOAM. First, the validity and performance of the solver are assessed by simulating directly initiated detonation in a hydrogen/air mixture. Second, the study explores the one/two-dimensional (1D/2D) hotspot ignition for the primary reference fuel and illuminates the impact of transitioning to 2D simulations on the predicted combustion modes. The 2D hotspot simulations reveal a variety of 2D physical phenomena, including the appearance of converging shock/detonation fronts as a result of negative temperature coefficient (NTC) behavior and shock wave reflection-induced detonation. The main results of the paper are as follows: (1) NTC chemistry is capable of drastically changing the anticipated reaction front propagation mode by manipulating the local/global reactivity distribution inside and outside the hotspot, (2) subsonic hotspot ignition can induce detonation (superknock) through the generation of shock waves and subsequent wall reflections, and (3) while the 1D framework predicts the initial combustion mode within the hotspot, significant differences between 1D and 2D results may emerge in scenarios involving ignition-to-detonation transitions and curvature effect on shock/detonation front propagation.Description
Funding Information: We would like to acknowledge Aalto University and CSC (Finnish IT Center for Science) for providing the computational resources. Funding Information: The present study has been financially supported by Neste Corporation, Finland, and the Academy of Finland (Grant Nos. 318024, 332784, and 332835). Publisher Copyright: © 2023 Author(s).
Keywords
Other note
Citation
Shahanaghi, A, Karimkashi, S, Kaario, O & Vuorinen, V 2023, ' Efficient two-dimensional simulation of primary reference fuel ignition under engine-relevant thermal stratification ', PHYSICS OF FLUIDS, vol. 35, no. 12, 126102 . https://doi.org/10.1063/5.0174778