HCCI Modeling - Background HCCI Intakes pre-mixed fuel-air...

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HCCI Background Intakes pre-mixed fuel-air charge Compression initiates combustion No discernable flame front Ultra-low NOx & PM emissions Unlike SI or CI engines, HCCI requires advanced control strategies for proper control of combustion phasing. A model which captures the key dynamics of the HCCI process is essential to achieve this control. Modeling the onset of combustion is difficult due to its dependence on chemical kinetics through reactant concentrations and temperature. Control-oriented models must remain as simplistic as possible while still capturing the key dynamics of the process.
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Model Development Five state thermodynamic cycle Adiabatic, constant pressure induction Isentropic compression Constant volume combustion Isentropic expansion Isentropic blowdown to an adiabatic, constant pressure exhaust Stoichiometry modeled using C/H = 7/16 Gasoline-type fuels (exhibit little low temperature heat release (LTHR)) Extension to other fuels possible
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Model Development Engine cycle begins with compression.
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This note was uploaded on 02/01/2012 for the course MECH ENG 333 taught by Professor Drallmeier during the Spring '11 term at Missouri S&T.

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HCCI Modeling - Background HCCI Intakes pre-mixed fuel-air...

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