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International Journal of Automotive Technology > Volume 19(1); 2018 > Article
International Journal of Automotive Technology 2018;19(1): 9-25.
doi: https://doi.org/10.1007/s12239-018-0002-7
FLAME PROPAGATION MODEL FOR A ROTARY ATKINSON CYCLE SI ENGINE
Mohammad Hassan Shojaeefard, Mojtaba Keshavarz
Iran University of Science and Technology
ABSTRACT
The rotary Atkinson cycle engine includes two modes of combustion: combustion initiation and propagation in ignition chamber and then flame jet entrainment and propagation in expansion chamber. The turbulent flame propagation model is a predictive model for SI engines which could be developed for this type of combustion for the rotary Atkinson engine similar to the congenital engine with pre-chamber; in split combustion chamber SI engines, small amount of fuel is burned in pre-chamber while the fuel burned in ignition chamber of rotary Atkinson cycle is considerable. In this study a mathematical modeling of spherical flame propagation inside ignition chamber and new combined conical flame and spherical flame propagation model of a new two-stroke Atkinson cycle SI engine will be presented. The mathematical modeling is carried out using two-zone combustion analysis and the model also is validated against experimental tests and compared with previous study using non-predictive Weibe function model.
Key Words: Turbulent flame, Jet entrainment, Internal combustion engine, Rotary engine
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