Unit INTERNAL COMBUSTION ENGINES

Course
Mechanical engineering
Study-unit Code
GP004967
Curriculum
Costruzioni
Teacher
Carlo Nazareno Grimaldi
Teachers
  • Carlo Nazareno Grimaldi
Hours
  • 96 ore - Carlo Nazareno Grimaldi
CFU
12
Course Regulation
Coorte 2022
Offered
2022/23
Learning activities
Caratterizzante
Area
Ingegneria meccanica
Academic discipline
ING-IND/08
Type of study-unit
Obbligatorio (Required)
Type of learning activities
Attività formativa monodisciplinare
Language of instruction
Italiano
Contents
Chemical, thermo-fluid dynamic and mechanic phenomena are treated, underlying operation performance and emissions of MCI, ensuring in particular a deep understanding of the phenomena by the students, to develop skills, and to transfer the gained skills in the design, even in an innovative sense.
Reference texts
G. Ferrari - Motori a combustione Interna - EsculapioJ.B. Heywood - Internal combustion engine fundamentals - Mc Graw Hill
Educational objectives
Develop and achieve an advanced knowledge about internal combustion engines operation and design criteria and methodologies.
Prerequisites
The course is imparted in the first semester of the first year of the Master of Science in Mechanical Engineering: consequently it is considered necessary and sufficient the education received in Mechanical Engineering Bachelor Degree courses.Of particular importance is considered the knowledge acquired in the courses: Physics, Applied Physics, Machinery and energy Systems.
Teaching methods
Face-to-face lessons (classroom / lab)
Other information
N.A.
Learning verification modality
Oral exam, indicative duration of between 30 and 50 minutes, so structured:- 2 questions, open answer;- 1 question about the results of a practical application of simulation codes, prepared in groups, with free timing (Application of numerical codes of one-dimensional computational fluid dynamics - CFD-1D).
Extended program
The morphology of the internal combustion engine and construction aspects.Motor-user: steady state motion, transient motion, motion in slope, the analytic calculation of the engine angular acceleration, dynamic balance, implementation of the calculation of the acceleration in a computer code.Volumetric efficiency in two and four stroke engines. Fundamental relations, engine test bench, engine maps.Steady effects at the intake: temperature, pressure drop, discharge coefficient.Dynamic effects at the Intake: inertial effects, wave effects, variable geometry systems.Experimental methods and instrumentation for flow analysis in intake systems: steady flow bench, dynamic flow bench, swirl and tumblemeasuring gauges.Supercharging.Valve lift and phase diagrams, parameters affecting volumetric efficiency.Two-stroke engines, dynamic effects in the exhaust systems.Fuels, determination of the Octane and Cetane numbers.Fuel feeding in compression ignition engines: pumps, injectors, common rail, spray characteristics: spray penetration, droplet size, jet diffusion angles; project of components; experimental methods for the analysis of the spray: PDA, PIV, Laser Sheet.Fuel feeding in spark ignition engines: PFI, GDI.In cylinder charge motion: turbulence and cyclic dispersion; swirl, squish, tumble.Combustion in internal combustion engines: chemical reactions, laminar and turbulent combustion, premixed and diffusive combustion, normal combustion in gasoline engines, heat release, non normal combustion in spark ignition engines: detonation, surface ignition; design of the combustion chamber.Combustion in compression ignition engines, heat release; design of the combustion chamber.Acoustic and thermal aspects of the ICEs operation.Pollutant emissions from ICEs: regulations; measurement procedures and instruments; engine emissions; emission reduction systems; OBD Diagnostics, application of artificial neural networks.Methodologies and tools for analyzing the characteristics of MCI in terms of performance and emissions.CFD-1D: one-dimensional computational fluid dynamics.CFD-3D: three-dimensional computational fluid dynamics.
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