Theory of Internal Combustion Engines

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Code Completion Credits Range Language
2211170 Z,ZK 5 4P+1C Czech
Garant předmětu:
Department of Automotive, Combustion Engine and Railway Engineering

Theoretical description and analysis of processes at internal combustion engines. Definition of physical models and basics of engine cycle modeling.

Syllabus of lectures:

. 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.

Syllabus of tutorials:
Study Objective:
Study materials:

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

. Macek, J. - Suk, B.: Spalovací motory I. Skripta ČVUT.

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

. PPT prezentace jako doplněk k přednáškám - obsahuje důležité rovnice a diagramy související s hlavními tématy předmětu - na serveru studijních podkladů https://studium.fs.cvut.cz/studium/u12120/

Further information:
No time-table has been prepared for this course
The course is a part of the following study plans:
Data valid to 2024-05-24
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