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Effects of fuel composition on auto-ignition and detonation development in boosted spark-ignited engines. King Abdullah Univ of Science and Tech
- Format:
- Book
- Conference/Event
- Author/Creator:
- Gorbatenko, Inna, author.
- Conference Name:
- 15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- The development of highly boosted spark-ignition engines with enhanced thermal efficiencies and increased compression ratios is primarily limited by knock and super-knock. Super-knock is an excessively high intensity knock which can be related to a developing detonation. This study investigates the knocking tendency of different surrogate fuels with varying research octane numbers (RON), octane sensitivity (S) and composition. The ξ/ diagram with an enclosed detonation peninsula is used to assess the knocking tendency of different surrogate fuels. This plots ξ, the ratio of acoustic to auto-ignitive velocity, against , the ratio of the transit time of an acoustic wave through a hot spot, to the heat release time (τe). Constant volume simulations of auto-ignition delay times (τi) and excitation times (τe) in Chemkin, enable calculations of ξ and . Their location for different fuels and operating conditions on the ξ/ diagram, relative to the detonation peninsula, defines their mode of reaction propagation and the severity of a detonation. It was shown that excitation times are not affected by RON and S of the fuel. However, they are strongly dependent on the mixture composition and the palette of hydrocarbon species. Fuels exhibiting a strong negative temperature chemistry (NTC) region are found to enter detonation development and explosion region, which would result in super-knock events in boosted spark-ignition engines
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-24-0022
- Access Restriction:
- Restricted for use by site license
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