To understand the exchange of work between the axis of a thermal turbomachine and the working medium, as well as the application of gas dynamics, thermodynamics and fluid mechanics for the aerothermodynamic analysis of the operation of steam and gas turbines, compressors and fans. Classification of these machines (axial, radial, etc). Reference to their operational characteristics and elements of the way they are constructed and structured.

Course Description 

This course includes elements of thermodynamics for thermal turbomachines, one-dimensional aerodynamics (compressibility, sonic velocity, Mach number, isentropic flow, shock waves, flow in ducts with varying area-diffusers / nozzles), fluid mechanics and wing theory. It mainly focuses on the one-dimensional analysis of these machines, description of the stage and its operation, the Euler equation for turbomachines, the concepts of absolute and relative velocity in a rotating frame of reference, velocity triangles, isentropic and polytropic efficiency, special parameters (e.g. flow and load coefficient, reaction degree) either on compressors and fans (axial, centrifugal) or turbines (axial, radial). Finally, references are made to similarity theory, to operational characteristics (maps) of these machines and special topics are discussed (like structural topics, current research in the relevant technology, Computational Fluid Dynamics for the numerical simulation of flows in turbomachines, online diagnostic techniques, etc).

Expected Course Outcome

By the end of the course the students should: 

• Know the operation principles of thermal turbomachines and the relevant energy conversion they achieve.
• Be able to carry out computations for the one-dimensional aerothermodynamic analysis of a compressor or turbine stage.
• Be aware of the basic kinds of compressors and turbines and the parameters affecting their operation

Bibliography

Greek:

1. Ν. Δ. Νανούσης, Χ. Β. Σταμούτσος, «Βασικές αρχές στροβιλομηχανών», Εκδόσεις ΙΩΝ, 2004.
2. Κ. Δ. Παπαηλιού, Κ.Μ. Μαθιουδάκης, Κ.Χ. Γιαννάκογλου, «Εισαγωγή στις Θερμικές Στροβιλομηχανές», Εργαστήριο Θερμικών Στροβιλομηχανών ΕΜΠ, Αθήνα 1996.
3. Α. Γούλας, «Βασικές αρχές στροβιλομηχανών», Εκδόσεις Γιαχούδη-Γιαπούλη, Θεσσαλονίκη.

English:

1. P.H. Oosthuizen, W.E. Carscallen, “Compressible Fluid Flow”, Mc Graw-Hill, 1997.
2. A Valan Arasu, “Turbomachines”, Vikas Publishing House PVT LTD, 2001.
3. D. Japikse, N.C. Baines, “Introduction to Turbomachinery”, Concepts ETI, Inc. and Oxford University Press, 1994.
4. S.M.Yahya, “Turbines, Compressors and Fans”, Tata Mc Graw Hill, 1983.
5. R.I. Lewis, “Turbomachinery Performance Analysis”, Arnold, A member of the Hodder Headline Group, 1996.
6. S.L. Dixon, “Fluid Mechanics, Thermodynamics of Turbomachinery”, 5th Edition in SI/Metric Units, Pergamon Press, 1998
7. D.G. Wilson, T. Korakianitis, “The design of high-efficiency turbomachinery and gas turbines”, Prentice Hall, 1998.
8. R. Logan, R. Ramendra , “Handbook of Turbomachinery”, Marcel-Dekker, 1998.