Theory of ICE and Simulation

Garant předmětu:

Oldřich Vítek

Přednášející:

Marcel Diviš, Oldřich Vítek

Cvičící:

Marcel Diviš, Oldřich Vítek

Předmět zajišťuje:

ústav automobilů, spalovacích motorů a kolejových vozidel

Anotace:

Theoretical description of internal combustion engine (ICE) is presented - description of important physical phenomena including their mathematical models.

Požadavky:

Osnova přednášek:

. Basic conservation laws - mass, momentum and energy.

. Basics of ICE combustion - laminar/turbulent flame, physical/chemical induction time.

. Application of thermodynamic laws to combustion case - 1st law of thermodynamics, „chemical“ enthalpy and lower heating value of fuel, adiabatic flame temperature. Basics of combustion chemistry - equilibrium, kinetics.

. Chained chemical reactions, chemical mechanism of hydrogen/hydrocarbon, introduction to pollutant production in ICE.

. Combustion in ICE - time evolution (rate of heat release), different combustion systems (SI, CI, HCCI, CAI, PCI, etc).

. In-cylinder turbulence and its influence on in-cylinder transport processes.

. SI engine combustion - rate of heat release (ROHR), turbulent flame structure, influence of turbulence, thermodynamic analysis (single/multi-zone model), mixture ignition, influence of ROHR on ICE thermodynamic cycle (including cyclic variations), incorrect combustion modes (knocking, incomplete combustion, etc.), limits of stable ICE operation.

. CI engine combustion - high-pressure fuel injection, combustible mixture formation, fuel jet time evolution, fuel drops (size distribution, SMD, time decay, evaporation), fuel jet interaction with walls and with in-cylinder large-scale flow strucutre(s), ROHR, influence on ICE thermodynamic cycle.

. Homogeneous combustion (HCCI), CAI, etc. - general properties, advantages/disadvantages, simplified description.

. Pollutant production in ICE - pollutant formation of general point of view, specifics of different combustion systems (SI, CI, etc.), NOx formation in SI engine (Zeldovich model), CO formation, unburnt hydrocarbons formation, estimate of exhaust gas composition.

. Energy fluxes in ICE - heat transfer (Woschni, Eichelberg), detailed thermodynamic analysis, warm-up of exhaust manifold. Mechanical losses in ICE - mechanical efficiency, simplified models.

. Gas exchange process - 2-sroke/4-stroke ICE, large-scale in-cylinder flow structures, properties of intake/exhaust ports, combustion chamber geometry shape - SI/CI engines.

Osnova cvičení:

Cíle studia:

Studijní materiály:

. Heywood, J.B.: Internal Combustion Engine Fundamentals. McGraw-Hill, London, England. 1988. ISBN 0-07-028637-X.

. Wilcox, D. C.: Turbulence Modeling for CFD. DCW Industries, Inc., California, 1993.

. PPT presentation - it contains important equations and diagrams related to main topics - it is located on server https://studium.fs.cvut.cz/studium/u12120/

Poznámka:

Rozvrh na zimní semestr 2024/2025:

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St	místnost T4:A1-304 Vítek O. Diviš M. 08:00–11:30 (přednášková par. 1) Dejvice Učebna 304místnost T4:A1-304 Vítek O. Diviš M. 11:30–12:15 (přednášková par. 1 paralelka 101) Dejvice Učebna 304
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