Module Title Fluid Machines 1
ID Module Code 72377
Semester I
Module Credits (CFU) 6 Module Scientific-Disciplinary
Sector ING-IND/08
Lecturer-in-charge MARELLI Silvia
Learning Outcomes
The aim of the course is to provide an adequate and critical knowledge on the main fluid machines with particular reference to those applied to naval propulsion sector, taking into account turbines, compressors and pumps, internal combustion engines with special reference to energy-related and environmental issues.
Course Organization Details Lectures
General remarks on fluid machines – Primary energy sources and their transformations – Power plants and relevant application areas – Energy equation and expression of work in closed and open systems - Fluid machines classification - Work exchange in volumetric machines and turbomachines - Euler’s equation - Conversion efficiency in fluid machines - Thermodynamic cycles - Thermal power plants overall efficiency - Specific fuel consumption.
Internal Combustion Engines (ICE) – ICE classification, engine components, nomenclature, operational parameters – Ideal and real operation of 2 and 4 stroke engines – Reference thermodynamic cycles for SI and diesel engines – Combustion processes in ICE – Indicated diagrams, indicated and brake mean effective pressure, engine power correlations – Engine part load operation – Constant speed and constant load curves, engine performance maps – Supercharging and turbocharging – ICE pollutant emissions – Emission control systems and aftertreatment devices.
Compressors and pumps – Positive displacement and dynamic compressors – Compressor insertion in a circuit – Characteristic curves - Positive displacement and dynamic pumps – Pumps operative problems: operating point and flow regulation, series and parallel operation, pump priming, surge and cavitation.
Steam power plants – Steam cycles - Methods to improve the cycle performance – Steam cycle components: boiler, steam turbines, condenser, pumps, heat exchangers.
Gas turbine power plants – General aspects, open and closed circuit plants - Gas cycles: ideal and fuel-air and real cycle - Gas turbine power plant components: compressor, combustion chamber, expander.
Practice
Calculation of energy systems, compressors, pumps and internal combustion engines operating parameters.
Assessment Hours
Lectures 60.0
Practice 0.0
Laboratory 0.0
Integrative activities 0.0
References
- S. Marelli: “Macchine 1” – Notes to the course (in Italian).
- S.L.Dixon - Fluid Mechanics Thermodynamics of Turbomachinery - Pergamon Press, 2005.
- C.R. Ferguson, A.T. Kirkpatrick - Internal Combustion Engines - Wiley, 2001.
Examination Oral test.
