- Docente: Fabrizio Ponti
- Credits: 6
- SSD: ING-IND/08
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Forli
- Corso: First cycle degree programme (L) in Aerospace Engineering (cod. 8263)
Course contents
Basic knowledge
Classification of machinery.
Water as a potential fluid: characteristics and Ts and hs
diagrams.
Conservation of mass. Energy conservation: first principle for a
closed system and for an open system (mechanical and thermal).
Entropy and enthalpy.
Ideal gas and ideal fluid: definition, major transformations and
their representation on the Ts, hs diagrams. Work and
efficiency, polytropic and isentropic efficiency for a compression
and an expansion.
Combustion: definition of stoichiometric air, excess air, lower
heating value.
Gas turbine thermodynamic cycle
Generality, Brayton cycle, simple plant configuration and
cycle representation on the diagram Ts. Conditions for the
representability of the cycle in the Ts diagram. Thermodynamic
analysis of gas turbine self-sustaining condition. Assessment of
performance. Condition of maximum useful work and maximum
efficiency.
Regenerative cycle, thermodynamic diagrams, problems and
limitations in employment.
Cycle with separated compression phases (inter-cooling):
Schematic diagram and thermodynamic conditions. Complete
inter-cooling, condition of maximum useful work, problems and
limitations in employment.
Post-combustion cycle: Schematic diagram and thermodynamic
process.
Turbine blades cooling: techniques and evaluation of the needed
cooling mass flow rate, typical blades materials.
Centrifugal compressor: specific work and efficiency. Compressors
and turbines performance representation.
Axial compressor: velocity triangles, specific work and efficiency.
Surge, chocking. Inducer. Starting problems for axial compressors.
Compression refrigeration cycle
Definition of COP. Cycle at saturated vapor compression cycle
(biphasic with intercooler, dual-separator, dual-separator with
bubbler), biphasic compression cycle with two temperatures of
vaporization. Characteristics of fluids for refrigeration equipment
and their classification.
Applications of refrigeration cycles to liquefaction of hydrogen
and oxygen.
Readings/Bibliography
Sistemi energetici e loro componenti, 2a ed., G. Negri di Montenegro, M. Bianchi, A. Peretto, Pitagora Editrice Bologna
Teaching methods
Theaching is organized in class lectures and numerical exercises
Assessment methods
The final exam will be a discussion on the topics presented in class
Teaching tools
The slides used by the teacher are available.
Office hours
See the website of Fabrizio Ponti