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Effects of Fuel Composition on Auto-Ignition and Detonation Development in Boosted Spark-Ignited Engines

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Non-members (tax incl.)：￥6,600 Members (tax incl.)：￥5,280
Paper/Info type
SAE Paper

No.2021-24-0022

Pages
1-14(Total 14 p)
Date of publication
Sep 2021
Publisher
SAE International
Language
English
Event
International Conference on Engines and Vehicles 2021

Detailed Information

Author(E)1) Inna Gorbatenko, 2) Eshan Singh, 3) Mani Sarathy, 4) Andre Nicolle
Affiliation(E)1) King Abdullah Univ of Science & Tech, 2) King Abdullah Univ of Science & Tech, 3) King Abdullah Univ of Science & Tech, 4) Aramco Fuel Research Center, KAUST
Abstract(E)The development of highly boosted and high compression spark-ignition engines with enhanced thermal efficiencies is primarily limited by knock and super-knock. Super-knock is an excessively high intensity knock which has been related to a developing detonation process. This study investigates the knocking tendency of different gasoline surrogate fuels with varying research octane numbers (RON), octane sensitivity (S) and composition. The ξ/ɛ diagram with an enclosed detonation peninsula is used to assess the knocking tendency of different fuels. The diagram plots ξ, the ratio of acoustic to auto-ignitive velocity, against ɛ, 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) obtained from chemical kinetic calculations, enable calculations of ξ and ɛ. Their location for different fuels and operating conditions on the ξ/ɛ 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. Fuels exhibiting a strong negative temperature chemistry (NTC) region are found to enter detonation development and explosion region, and are more likely to result in super-knock events in boosted spark-ignition engines.

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