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• W2274454039 abstract "Controlled Auto Ignition (CAI) combustion is a new combustion principle in internalcombustion engines which has in recent years attracted increased attention. In CAIcombustion, which combines features of spark ignition (SI) and compression ignition(CI) principles, air/fuel mixture is premixed, as in SI combustion and auto-ignitedby piston compression as in CI combustion. Ignition is provided in multiple points,and thus the charge gives a simultaneous energy release. This results in uniformand simultaneous auto-ignition and chemical reaction throughout the whole chargewithout flame propagation. CAI combustion is controlled by the chemical kineticsof air/fuel mixture with no influence of turbulence.The CAI engine offers benefits in comparison to spark ignited and compressionignited engines in higher efficiency due to elimination of throttling losses at partand idle loads. There is a possibility to use high compression ratios since it is notknock limited, and in significant lower NOx emission (≈90%) and particle matteremission (≈50%), due to much lower combustion temperature and elimination offuel rich zones.However, there are several disadvantages of the CAI engine that limits its practicalapplication, such as high level of hydrocarbon and carbon monoxide emissions, highpeak pressures, high rates of heat release, reduced power per displacement anddifficulties in starting and controlling the engine.Controlling the operation over a wide range of loads and speeds is probably the majordifficulty facing CAI engines. Controlling is actually two-components as it consistsof auto-ignition phasing and controlling the rates of heat release. As CAI combustionis controlled by chemical kinetics of air/fuel mixture, the auto-ignition timingand heat release rate are determined by the charge properties such as temperature,composition and pressure. Therefore, changes in engine operational parameters or intypes of fuel, results in changing of the charge properties. Hence, the auto-ignitiontiming and the rate of heat release.The Thesis investigates a controlled auto-ignition (CAI) combustion in internal combustionengines suitable for transport applications. The CAI engine environment issimulated by using a single-zone, homogeneous reactor model with a time variablevolume according to the slider-crank relationship. The model uses detailed chemicalkinetics and distributed heat transfer losses according to Woschini's correlation [1].The fundamentals of chemical kinetics, and their relationship with combustion relatedproblems are presented. The phenomenology and principles of auto-ignitionprocess itself and its characteristics in CAI combustion are explained. The simulationmodel for representing CAI engine environment is established and calibratedwith respect to the experimental data. The influences of fuel composition on theauto-ignition timing and the rate of heat release in a CAI engine are investigated.The effects of engine parameters on CAI combustion in different engine conceptsfuelled with various fuels are analysed. The effects of internal gas recirculation(IEGR) in controlling the auto-ignition timing and the heat release rate in a CAIengine fuelled with different fuels are investigated. The effects of variable valvetimings strategy on gas exchange process in CAI engine fuelled with commercialgasoline (95RON) are analysed." @default.
• W2274454039 created "2016-06-24" @default.
• W2274454039 creator A5039070173 @default.
• W2274454039 date "2003-01-01" @default.
• W2274454039 modified "2023-09-25" @default.
• W2274454039 title "A study of controlled auto ignition (CAI) combustion in internal combustion engines" @default.
• W2274454039 hasPublicationYear "2003" @default.
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