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THERMAL AND FLUID MACHINERY

CODE 72377
ACADEMIC YEAR 2022/2023
CREDITS
  • 12 cfu during the 2nd year of 8721 INGEGNERIA NAUTICA (L-9) - LA SPEZIA
  • SCIENTIFIC DISCIPLINARY SECTOR ING-IND/08
    LANGUAGE Italian
    TEACHING LOCATION
  • LA SPEZIA
  • SEMESTER 2° Semester
    PREREQUISITES
    Prerequisites
    You can take the exam for this unit if you passed the following exam(s):
    • Pleasure Craft Engineering 8721 (coorte 2021/2022)
    • GENERAL PHYSICS 56987
    • INGEGNERIA E DESIGN PER LA NAUTICA 10134 (coorte 2021/2022)
    • GENERAL PHYSICS 56987
    MODULES This unit is a module of:
    TEACHING MATERIALS AULAWEB

    OVERVIEW

    The course deals with the most relevant topics relating to the main fluid machines with particular reference to those applied to naval propulsion sector

    AIMS AND CONTENT

    LEARNING OUTCOMES

    Provide the knowledge for knowledge and understanding of the driving machines operating principles and operators and related facilities , and the types used on board. Provide the selection criteria and proper installation of the machines , illustrating the functional aspects of the regulation .

    AIMS AND 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.

    The student attendance during the lessons and related study activities will allow:

    - to identify the main features of the internal combustion engines used in the different application areas;

    - to know the main features related to environmental impact of internal combustion engines;

    - to identify the main features of the internal combustion engines used in the different application areas.

    TEACHING METHODS

    Lectures on the different items presented in the course programme and exercises on specific arguments developed within the course.

    SYLLABUS/CONTENT

    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.
    • Alternative fuels  – Natural Gas: problems, energy-related, operating and economic issues, effect on exhaust emissions.

    Practice

    • Calculation of energy systems, compressors, pumps and internal combustion engines operating parameters.

    RECOMMENDED READING/BIBLIOGRAPHY

    Lesson notes and classroom material (which can be downloaded in aulaweb) are sufficient for the exam preparation.

    • 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.

    TEACHERS AND EXAM BOARD

    LESSONS

    EXAMS

    EXAM DESCRIPTION

    Oral exam focusing on specific arguments developed within the course.

    ASSESSMENT METHODS

    Oral exam on the main subjects of the lessons. The oral examination will be focused on the topics treated during the lessons and will be aimed at evaluating not only the fulfilment of an adequate knowledge level, but also the acquisition of critical analysis skills on the topics of the exam.

    Exam schedule

    Date Time Location Type Notes

    FURTHER INFORMATION

    Pre-requisites:

    - Basic thermodynamic and fluid dynamics knowledge.