Politecnico di Torino
Politecnico di Torino
Politecnico di Torino
Academic Year 2016/17
Fluid machines
1st degree and Bachelor-level of the Bologna process in Chemical And Food Engineering - Torino
1st degree and Bachelor-level of the Bologna process in Material Engineering - Torino
Master of science-level of the Bologna process in Chemical And Sustainable Processes Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Marzano Mario Rocco ORARIO RICEVIMENTO     50 30 0 0 9
SSD CFU Activities Area context
ING-IND/08 8 C - Affini o integrative Attivitą formative affini o integrative
Subject fundamentals
The module aims at supplying the fundamentals of 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 it is inserted. In particular, steam and gas turbines, compressors, pumps and plants in which they are inserted, and internal combustion engines are analyzed. The exhaust emissions of gas turbine and internal combustion engines are also considered, as well as how to control and/or reduce them.
Expected learning outcomes
Through the systematic application of the principles of thermo-fluid-dynamics to energy conversion systems and their components, the module provides the students with the ability not only to choose engines and engineering-plant solutions in relation to their applications, but also to approach and solve specific design problems by integrating the concepts acquired in the module with advanced notions on specific topics.
Prerequisites / Assumed knowledge
The preliminary knowledge acquired in the courses of Thermodynamics and Thermokinetics, Applied Mechanics and Fluid Mechanics.
- Classification of fluid-flow machines, energy systems and their applications. Primary energy sources.
- Principles of energy conversion; thermodynamics of fluid-flow machines and energy systems.
- Turbomachinery: blades and principle of operations.
- Principles of thermodynamics applied to turbomachinery; velocity triangles and Eulerian expression of the shaft work ; transformations of fluid between turbomachinery vanes: nozzles and diffusers.
- Thermodynamic charts and cycles; fundamental problems in engine plants: efficiency and fuel consumption of heat engines.
- Stationary and dynamic components in heat engine plants. Steam generators and burners: energy balance and efficiency.
- 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
Delivery modes
The classroom 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.
Assessment and grading criteria
The exam is written and aims to test the comprehension of the topics covered in lectures.

Programma definitivo per l'A.A.2016/17

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