Abstract
The ignition process, mode of combustion and reaction front propagation in a partially premixed combustion (PPC) engine running with a primary reference fuel (87 vol% iso-octane, 13 vol% n-heptane) were investigated numerically in a large eddy simulation (LES). A one-equation sub-grid scale model coupled to the partially stirred reactor model and a finite rate chemical model were used in LES. Different combustion modes, ignition front propagation, premixed flame and non-premixed flame, were observed simultaneously. Displacement speed of CO iso-surface propagation described the transition of premixed auto-ignition to non-premixed flame. High temporal resolution optical data of CH2O and chemiluminescence were compared with simulated results. A high-speed ignition front was found to expand through fuel-rich mixture and stabilize around stoichiometry in a non-premixed flame while lean premixed combustion occurs in the spray wake at a much slower pace. A good qualitative agreement of the distribution of chemiluminescence and CH2O formation and destruction indicated that the simulation approach sufficiently captures the driving physics of mixed-mode combustion in PPC engines. The transition from auto-ignition to flame occurs over a period of several crank angles and the reaction front propagation can be captured using the described model.
Original language | English |
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Title of host publication | Proceedings of the Combustion Institute |
Publisher | Elsevier |
Pages | 5703-5711 |
Number of pages | 9 |
Volume | 38 |
Edition | 4 |
DOIs | |
Publication status | Published - 2021 |
Event | 38th International Symposium on Combustion, 2021 - Adelaide, Australia Duration: 2021 Jan 24 → 2021 Jan 29 |
Conference
Conference | 38th International Symposium on Combustion, 2021 |
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Country/Territory | Australia |
City | Adelaide |
Period | 2021/01/24 → 2021/01/29 |
Subject classification (UKÄ)
- Mechanical Engineering
Free keywords
- Ignition
- Low temperature combustion
- Mixed-mode combustion
- Partially premixed combustion
- Reaction front