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Abstract
End-gas auto-ignition leading to knocking combustion is one of the major barriers to achieving higher thermal efficiencies in downsized boosted spark-ignition engines. Despite the available framework addressing hotspot-induced ignition (detonation peninsula), a quantitative investigation on hotspot-induced auto-ignition of gasoline surrogates is yet to be done. In particular, the effect of negative temperature coefficient (NTC) chemistry on the distribution of the ignition modes in the detonation peninsula is still missing. Using the established one-dimensional (1D) theoretical and computational framework, the effect of average temperature (including NTC range), initial pressure, and ethanol addition are investigated. Moreover, appearance of NTC chemistry-related events i.e. coolspots, secondary ignition kernels, and off-centered ignition are analyzed using 1D simulations. The results are as follows. 1) NTC chemistry affects the distribution of ignition regimes in detonation peninsula and the dynamics of the front propagation via altering the reactivity gradient. 2) NTC chemistry increases the temperature gradient range associated with the detonation regime. 3) NTC may inhibit detonation development by simultaneously promoting the spontaneous/supersonic ignition modes. 4) An ethanol blend decreases the knock propensity; however, lower ignitability may promote detonation development and the appearance of strong shock waves. 5) Finally, detonation may result in a normal knock at lower initial pressures (20 bar). However, at elevated initial pressures (50 bar), detonation is noted to yield pressure intensities resembling super-knock.
Original language | English |
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Pages (from-to) | 1702-1742 |
Number of pages | 41 |
Journal | Combustion Science and Technology |
Volume | 196 |
Issue number | 11 |
Early online date | 4 Oct 2022 |
DOIs | |
Publication status | Published - 2024 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Combustion modes
- gasoline surrogates
- knock
- spark ignition engines
- temperature stratification
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Dive into the research topics of 'Temperature Stratification Induced Ignition Regimes for Gasoline Surrogates at Engine-Relevant Conditions'. Together they form a unique fingerprint.Projects
- 2 Finished
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DIAG/Karimkashi: Multi-fuel combustion: development of a diagnostic tool for carbon-neutral combustion
Karimkashi Arani, S. (Principal investigator)
01/09/2020 → 31/08/2023
Project: Academy of Finland: Other research funding
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Tri-Reactivity Ignition: Simulation and Experiments
Vuorinen, V. (Principal investigator), Morev, I. (Project Member), Cheng, Q. (Project Member), Tamadonfar, P. (Project Member), Gadalla, M. (Project Member) & Kannan, J. (Project Member)
01/09/2018 → 31/08/2022
Project: Academy of Finland: Other research funding