TURBOMACHINERY
Academic year and teacher
If you can't find the course description that you're looking for in the above list,
please see the following instructions >>
- Versione italiana
- Academic year
- 2015/2016
- Teacher
- PIER RUGGERO SPINA
- Credits
- 6
- Curriculum
- INDUSTRIALE
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/08
Training objectives
- The course aims to provide basic methodologies for the fluid-dynamic design of turbomachinery. Knowledge and tools are provided to perform the "external" design, by using statistical correlations, the one-dimensional design of both radial-flow and axial-flow turbomachinery, and the two-dimensional design of axial-flow turbomachinery, by using aerodynamic techniques. The methodologies aim at providing necessary skills to perform the preliminary fluid-dynamic design of turbomachinery.
Prerequisites
- Knowledge provided in the course of "Macchine" of the Mechanical Engineering Bachelor Degree.
Course programme
- The course is organized in 48 hours of both classroom lectures and tutorials. The main topics discussed during the course are:
1) Definition of turbomachinery; dimensional analysis and theory of similitude; turbomachinery classification; statistical correlations for the “external” design of the turbomachinery (6 hours).
2) One-dimensional theory of turbomachinery; streamline plotting on the meridian plane; assessment of the effects of the finite number of blades according to Stodola and Pfleiderer methods; procedures for the design of both radial-flow and axial-flow turbomachinery; blade profile plotting through point-to-point and conformal representation methods; volute design (12 hours).
3) Two-dimensional fluid flow theory. Aerodynamic of wing sections: influence of Mach number, aspect ratio and thickness-to-chord ratio; aerodynamic theory; overlapping of aerodynamic effects; NACA wing sections (10 hours).
4) Blade cascade performance; evaluation of cascade effect; design and verification of both fixed and rotor cascades of axial-flow turbomachinery through Weinig, Howell and Carter methods; blade plotting; blade thickness calculation (12 hours).
5) One-dimensional design of a radial-flow turbomachinery or two–dimensional design of an axial-flow turbomachinery and CAD 3D plotting of the obtained geometry (8 hours). Didactic methods
- The course is organized as follow:
• lectures (40 hours);
• tutorials (8 hours), within the integrated course “Turbomacchine + Progettazione Fluidodinamica delle Macchine”, during which the project of a radial-flow turbomachinery (by using the one-dimensional approach), or of an axial-flow turbomachinery (by using the two-dimensional approach) will be carried out and the obtained geometry will be plotted with CAD 3D. Learning assessment procedures
- The examination aims to check the level of achievement of training goals.
The exam of the integrated course “Turbomacchine + Progettazione Fluidodinamica delle Macchine” is carried out in an integrated way and, usually, consists in:
• presentation and discussion of a project developed in group during the tutorials of the course; students will be divided into groups and at each group will be assigned a project, which normally consists in the CFD analysis of a given turbomachinery geometry, eventually proposing geometry modifications in order to improve performance;
• two questions on the topics discussed in the courses “Turbomacchine” and “Progettazione Fluidodinamica delle Macchine” (one question for each of the two part of the integrated course).
For passing the exam the candidate must prove to have the basic knowledge on all the subjects of the integrated course. In the positive score determination the presentation and discussion of the project weigh for about 75 %; the gradation of the score from 18 to 30 depends on clarity and rigor that the candidate proves during the presentation and discussion of a project and on deepening and rigor that the candidate proves on the knowledge of the topics discussed in the integrated course. Reference texts
- Recommended texts
- Bettocchi R. - Turbomacchine - Pitagora Ed., Bologna, 1994.
Consultation texts
- Acton O. - Turbomacchine - UTET, 1986.
- Acton O., Caputo C. - Introduzione allo studio delle macchine - UTET, 1979
- Abbott I.H.,Von Doenhoff A.E. - Theory of Wing Sections - Dover Publications, 1959.
- Csanady G.T. - Theory of Turbomachines - McGraw Hill, 1964.
- Dixon S.D. - Fluid Mechanics and Thermodynamics of Turbomachinery - Elsevier, 2010.
- Eckert B. - Axialkompressoren und radialkompressoren - Springer Verlag, 1953.
- Lazarkiewicz S.,Troskolanski A.T. - Impeller Pumps - Pergamon Press, 1965.
- Osnaghi G. - Macchine fluidodinamiche - CLUP, Milano, 1979.
- Pfleiderer C., Peterman H. - Turbomacchine - Tecniche Nuove, 1985
- Pope A. - Wind Tunnel Testing - John Wiley & Sons, 1954.
- Sandrolini S., Borghi M., Naldi, G. – Turbomacchine termiche. Turbine – Pitagora, 1992.
- Sandrolini S., Naldi G. – Macchine 1. Fluidodinamica e termodinamica delle turbomacchine – Pitagora, 1997.
- Sandrolini S., Naldi G. – Macchine 2. Le turbomacchine motrici e operatrici – Pitagora, 1998.
- Riegels F.W. - Aerofoil Sections - Butterworths, 1961.
- Ventrone G. - Le turbomacchine - Libreria Cortina, Padova, 1975.
- Wislicenus G.F. - Fluid Mechanics of Turbomachinery - Dover Publications, 1965.
