Study-unit MACHINE
| Course name | Mechanical engineering |
|---|---|
| Study-unit Code | 70300012 |
| Curriculum | Comune a tutti i curricula |
| Lecturer | Michele Battistoni |
| CFU | 12 |
| Course Regulation | Coorte 2022 |
| Supplied | 2024/25 |
| Type of study-unit | Obbligatorio (Required) |
| Type of learning activities | Attività formativa integrata |
| Partition |
MODULE A
| Code | 70074205 |
|---|---|
| CFU | 6 |
| Lecturer | Michele Battistoni |
| Lecturers |
|
| Hours |
|
| Learning activities | Caratterizzante |
| Area | Ingegneria energetica |
| Sector | ING-IND/08 |
| Type of study-unit | Obbligatorio (Required) |
| Language of instruction | Italian |
| Contents | - Introduction to fluid and thermal machines. - Power generating and power absorbing turbomachines operating with compressible fluid. - Power generating and power absorbing turbomachines operating with incompressible fluid. - Volumetric power generating and power absorbing machines. |
| Reference texts | Intructor's notes and personal notes. Course Book: V. Dossena et al., Macchine a fluido, Città Studi Edizioni, 2nd edition, 2020 Additional Reference books: - G. Bidini, Turbomacchine, Ed. Anteo, Perugia, 2008 - C. Caputo, Le Turbomacchine, Ambrosiana 1994 - G. Manfrida, S. Stecco, Le Turbomacchine, Pitagora Ed. 1993 - G. Cornetti, F. Millo, Macchine Idrauliche, Il Capitello, Torino, 2015 - G. Cornetti, F. Millo, Scienze Termiche e Macchine a Vapore, Il Capitello, Torino, 2015 - G. Cornetti, F. Millo, Macchine a Gas, Il Capitello, Torino, 2015 - S.L. Dixon, Fluid Mechanics and Thermodynamics of Turbomachinery, Elsevier, 2013 - L. Battisti, Gli Impianti Eolici, CittàStudi 2022 |
| Educational objectives | Acquire knowledge and skills concerning the analysis, selection and design of fluid machinery and components. |
| Prerequisites | knowledge of previous courses: Fisica Tecnica, Fisica and Analisi Matematica |
| Teaching methods | - lectures - exercises |
| Other information | |
| Learning verification modality | - written test - oral test |
| Extended program | - Introduction to fluid and thermal machines. Classification of Fluid Machinery: turbo- and volumetric machines, incompressible and compressible fluid. Theory of similitude, dimensional analysis. Reynolds number, Mach number, the specific speed, flow coefficients and pressure coefficient. Boundary layer, lift and drag of a profile. Basic equations of fluid mechanics. Turbine blades, phenomenology of the flow through orifices and blade passages. - Dimensional Analysis: Similitude. - Power generating turbomachines operating with Compressible fluid: steam turbines and gas turbines. Fluid dynamics of expansion nozzles, rotating and fixed vanes; static and total flow quantities; Hugoniot equations; Stodola cone, criteria for nozzle sizing; velocity triangles; work exchange between fluid and blades; degree of reaction; stage efficiency; volumetric efficiency; effect of steam humidity; multi-stage turbines; turbine types; three-dimensional effects; part-load operation of turbines. Basics of radial flow turbines. Steam turbine and gas turbine stages. Refrigeration of gas turbine blades. Power absorbing turbomachines operating with Compressible fluid: centrifugal and axial compressors. Introduction to centrifugal compressors; velocity triangles; dimensional analysis; flow and pressure coefficients; performance curves; slip factor, diffuser and volute. Sizing of a centrifugal compressor. Introduction to axial compressors; blades, vanes, stages; velocity triangles; dimensional analysis; flow and pressure coefficients; performance curves. Sizing of an axial compressor stage. Flow phenomenology through vanes. Limits of 1D approach; pressure profiles. Compressors in a system; stalling and surging. - Power generating turbomachines operating with Incompressible fluid: hydraulic turbines. Equations for incompressible flows; Bernoulli's equation; basics of hydroelectric power generation. Hydraulic turbine features; Pelton, Francis and Kaplan turbines. Degree of reaction; velocity triangles; dimensional analysis; flow and pressure coefficients; performance curves. Cavitation. - Power absorbing turbomachines operating with Incompressible fluid: pumps. Centrifugal pumps. Blades, vanes, velocity triangles; performance curves; diffuser, volute. Cavitation. NPSH, Pump-circuit system. Serial and parallel configuration. Centrifugal pump design. - Volumetric power generating and power absorbing machines. Positive displacement machines: volumetric pumps, piston pumps, screw pumps. Performance curves. - Open rotor turbomachines: 1. wind turbines, types, actuator disc approach and elements of blade theory, 2. fundamentals of propellers. |
MODULE B
| Code | 70074304 |
|---|---|
| CFU | 6 |
| Lecturer | Francesco Fantozzi |
| Lecturers |
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| Hours |
|
| Learning activities | Caratterizzante |
| Area | Ingegneria energetica |
| Sector | ING-IND/08 |
| Type of study-unit | Obbligatorio (Required) |