OVERVIEW

The unit provides the students with the fundamental skills to interpret the processes, as well as the technologies, related to fluid machines, thermal machines and energy conversion systems. This allows the student to master the basic principles of thermodynamics and fluid dynamics when applied to the design and the analysis of energy conversion equipment, as well as to address the functional behavior of fluid machines both in themselves and when components of power systems.

AIMS AND CONTENT

LEARNING OUTCOMES

The aim of the course is to provide the student with the fundamentals of the study of volumetric and dynamic fluid machines in order to analyze their functional behavior and evaluate the main performance aspects.

AIMS AND LEARNING OUTCOMES

At the end of the course the student will be able to:

• Describe and analyze operations of positive displacement and dynamic fluid machines, identifying strengths and weaknesses.
• Evaluate the main operational, performance and energy parameters of fluid machines, comparing the available options.
• Reproduce and discuss the characteristic curves of the different types of machines.
• Select the quantities related to the environmental impact of the machines.

Thanks to the attendance of the planned educational activities, it will be possible to obtain the following skills: ability to manage own social interactions, collaborative attitude, constructive communication in different environments (social competence).

TEACHING METHODS

The course is organized in lectures and and numerical practices. Exercises will be developed in groups, with presentation and discussion of the results among the students.

Students who have valid certification of physical or learning disabilities on file with the University and who wish to discuss possible accommodations or other circumstances regarding lectures, coursework and exams, should speak both with the instructor and with Professor Federico Scarpa (federico.scarpa@unige.it), the Polytechnic School's disability liaison.

SYLLABUS/CONTENT

A. Positive displacement fluid machines

- Introductory concepts

Classification of fluid machines. The energy equation and the expression of work. Conversion efficiency in fluid machinery. Work exchange in the positive displacement fluid machines .

- Reciprocating internal combustion engines (ICE)

Historical overview and fields of application. Basic knowledge on ICE: classification, components and nomenclature, main operational parameters. Ideal and real operation of 2 and 4 stroke engines. Indicated diagrams, indicated and brake mean effective pressure, engine power correlations. Reference thermodynamic cycles for spark ignition (SI) and diesel engines. Regular and abnormal combustion processes in ICE. Part load operation of SI and diesel engines. ICE performance curves. Supercharging and turbocharging: basic plants design, application fields, operational issues, thermodynamic cycles, compressor and turbine power. ICE pollutant emissions: influence of combustion process and operational engine parameters on exhaust emissions, emission control systems and aftertreatment devices for SI and diesel engines.

- Positive displacement compressors and pumps

Reciprocating displacement compressors: operating principle, constructive characteristics, ideal and real working cycle, flow rate control systems. Rotary displacement compressors: vane, lobe, liquid ring, screw compressors. Volumetric pumps: alternative and rotary machines, working principle, construction types. Characteristic curves. Fluid machine-circuit matching.

This unit contributes to the achievement of the following Sustainable Development Goals of the UN 2030 Agenda: Objectives 7 (Clean and Affordable Energy) and 13 (Fighting climate change).

RECOMMENDED READING/BIBLIOGRAPHY

• G. Zamboni - “Macchine volumetriche” – Appunti del corso.
• R. Della Volpe - “Macchine” - Liguori Editore, 2011.
• V. Dossena, G. Ferrari, P. Gaetani, G. Montenegro, A. Onorati, G. Persico - “Macchine a fluido” - CittàStudi Edizioni, 2020.
• G. Cornetti, F. Millo - “Macchine idrauliche”, “Macchine a gas” - Il Capitello, 2015.
• G. Ferrari - "Motori a combustione interna" - Esculapio, 2016.
• O. Acton, C. Caputo - “Compressori ed espansori volumetrici”, UTET, 1992.
• O. Acton - “Turbomacchine”, UTET, 1992.

TEACHERS AND EXAM BOARD

Exam Board

GIORGIO ZAMBONI (President)

DARIO BARSI

DANIELE SIMONI (President Substitute)

PIETRO ZUNINO (President Substitute)

VIRGINIA BOLOGNA (Substitute)

DANIELE PETRONIO (Substitute)

LESSONS

LESSONS START

https://corsi.unige.it/en/corsi/11438/studenti-orario

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

Oral exam on the topics presented during the lessons and exercises.

Students who have valid certification of physical or learning disabilities on file with the University and who wish to discuss possible accommodations or other circumstances regarding lectures, coursework, and exams, should speak both with the instructor and with Professor Federico Scarpa (Federico.Scarpa@unige.it), the Department's disability liaison. As an example, for students with specific learning disabilities, more time will be available, and the use of concept maps will be allowed.

ASSESSMENT METHODS

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 and the aptitude of correlation of different topics. The clarity of presentation, the correct use of technical terminology and the ability to reproduce technical diagrams will also be assessed.

Exam schedule

FURTHER INFORMATION

Pre-requisites:

Basic knowledge of thermodynamics and fluid mechanics.