Politecnico di Torino
Politecnico di Torino
Politecnico di Torino
Academic Year 2007/08
Thermal and hydraulic machines
Master of science-level of the Bologna process in Chemical Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Mittica Antonio ORARIO RICEVIMENTO PO ING-IND/08 42 14 0 0 17
SSD CFU Activities Area context
ING-IND/08 5 C - Affini o integrative Discipline ingegneristiche
Objectives of the course
The module aims at completing the formation on fluid-flow machines, with specific reference to constructive aspects, principles of operation, evaluation of performance and off-design operations of both the single fluid-flow machine and the energy system in which the fluid-flow machine is inserted.
The module considers the turbo machinery, their plants and regulation, the volumetric operating machines and reciprocating engines, of which the constructive aspects, the functioning and the regulation are examined. The exhaust emissions of gas turbine and internal combustion engines are also considered, as well as how to control and/or reduce them.
Expected skills
The module provides the students with the ability to choose engines and engineering-plant solutions in relation to their applications, and also to approach and solve specific design problems by integrating the concepts acquired in the module with advanced notions on specific topics.
The preliminary knowledge acquired in the courses of Applied Thermodynamics and Thermal Transmission, Applied Mechanics and Fundamental of Thermal and Hydraulic Machines.
- Gas compressors: minimum compression work, characteristic parameters of functioning. Blowers, fans reciprocating and rotary displacement-compressors; regulation of compressors.
- Hydraulic pumps: specific speed number and its influence on the pump geometry. Fluid-flow similarity and characteristic curves. Pumps regulation. Parallel and series connection of dynamic pumps to piping system. Pump cavitation, allowable suction head and permissible suction lift.
- Turbines and turbochargers: isentropic and polytropic efficiencies; one-dimensional analysis of the flow; design process and calculation of stage performance; choice of turbomachineries; similarity in fluid motion in turbomachinery; turbomachinery characteristics.
- Steam turbines: performance and regulation.
- Heating values and their application to thermodynamic analysis of the combustion. Constant-volume and constant-pressure combustion in ideal and real processes; combustion in steady-state flows.
- Gas turbine plants; analysis of the ideal cycle; effects of operating variables on the efficiency of gas-turbine cycle; schemes to improve cycle efficiency. Combined power plants and cogeneration plants.
- Internal combustion reciprocating engines: cycle analysis with ideal gas working fluid; fuel-air cycle analysis; real engine cycles; valve-timing and valve-lift diagrams; power output, mechanical efficiency, volumetric efficiency and engine operating parameters; correction factors for power and volumetric efficiency; engine operating characteristics.
- Gas turbines exhaust emissions. Formation of CO and oxide nitrogen. Reduction system for NO during the combustion. Dry low NOx (DLN) combustor.
- Internal combustion reciprocating engines exhaust emissions. Overview of emission formation mechanisms and of the regulation framework
Laboratories and/or exercises
The classroon training consists in solving exercises and practical problems by applying the concepts covered in the lectures. The aim of training is to give the students the order of magnitude of the main parameters and to improve their degree of understanding.
Engine workshops. Analysis of fluid engines and instrumentation present in the Engine Laboratory of Energetics Department. Measurement of operating characteristic of internal combustion engines.
Revisions / Exam
The exam is oral and aims to test the comprehension of the topics covered in lectures.

Programma definitivo per l'A.A.2009/10

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