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Scheda Riassuntiva
Anno Accademico 2018/2019
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 097600 - TURBOMACHINERY A
Docente Gaetani Paolo
Cfu 10.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (469) AERONAUTICAL ENGINEERING - INGEGNERIA AERONAUTICA*AZZZZ097354 - TURBOMACHINERY B
Ing Ind - Inf (Mag.)(ord. 270) - BV (477) ENERGY ENGINEERING - INGEGNERIA ENERGETICA*AZZZZ097354 - TURBOMACHINERY B
Ing Ind - Inf (Mag.)(ord. 270) - BV (479) MANAGEMENT ENGINEERING - INGEGNERIA GESTIONALE*AZZZZ097354 - TURBOMACHINERY B
097600 - TURBOMACHINERY A
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA*AZZZZ097600 - TURBOMACHINERY A

Obiettivi dell'insegnamento

The purpose of the course is to analyse in details the theoretical and practical fluid-dynamic features of hydraulic and thermal Turbomachinery. Thanks to the knowledge gained during the course, students will be able to proficiently face and solve the design issues as well as Turbomachinery performance testing and optimisation. As the technical scenario includes a large variety of Turbomachinery configurations, the course is focused on devices suited for energy conversion, industrial processes and aeronautical / ground  transportation.

Moreover, students can improve their soft skills by holding, on a voluntary basis, seminars on specific issues to the class in the frame of a flipped classroom methodology and by doing in groups a design project


Risultati di apprendimento attesi

Once the student has passed the exam, he will:

a) know the fundamentals of turbomachinery operation and be able to understand the critical issues in that event.

b) be able to analyse and understand the turbomachinery designs and their specific issues.

c) be able to understand and describe, both on a quality level and quantitatively, the turbomachinery operation in the thermo-fluid-dynamic perspective.

 

Consequently, the student will be able to:

a) design each single component of turbomachines by applying the most referenced design criteria for each class of turbomachines.

b) design the whole turbomachinery, also taking into account the different frame of reference and the source of component interaction.

c) design a multistage turbomachine in the context of an optimised load sharing.

d) propose a test methodology for the performance qualification.

e) improve his knowledge on the topic in an autonomous and self-directed manner, thanks to the robust bases gained in this course


Argomenti trattati

Topic 1 – Fundamentals of Aerodynamics, Thermodynamics and Turbomachinery Flow: Stresses in continuum media. Mass conservation equation, momentum balance, energy balance for open systems (all balances are discussed in both differential and integral forms). Equation for one-dimensional flows and for 2D - 3D complex flows in the stationary and rotating frame of reference. Lift and drag on profiles and blades. Viscous and turbulent flows; boundary layer. Principle and basic equations for thermodynamics, thermodynamic process representation, loss coefficient and efficiency parameters. Euler equation and reaction degree.

Topic 2 – Operation of Turbomachinery:  general performance curves, Model Theory and Similarity for incompressible flows. Turbomachinery classification on the basis of specific speed and specific diameter. Compressibility effects on the similarity laws for gas/steam turbines and compressors.

Topic 3 – Turbomachinery  fluid-dynamics :  Unsteady aspects, different frames of reference.  Projection on reference surfaces (blade to blade, meridional and secondary ones), main geometrical and fluid-dynamic quantities for turbomachinery cascades. Cascade effects. Radial equilibrium. Secondary flows, 3D effects, clearances and wake effects. Clearances geometries and design. 2D and 3D blade design concepts.

Topic 4 – Diffusers: geometries and operation for compressible and incompressible flows.  Shape factor and main performance parameters.

Topic 5 – Axial Compressors: classification and analysis according to 1D approach. Blade aerodynamics. Prediction of flow angle, losses and blades number by semi-empirical criteria. Blade loading criteria. Supersonic and chocked cascades. Off design operation.

Topic 6 – Radial Compressors: classification and analysis according to 1D approach. Slip factor. Losses in rotors and their geometry. Free vortex diffusers for subsonic and supersonic operation. Volute design.

Topic 7 –Compressors Instability:  Helmholtz theory. Blade stall and rotating stall. Surge and machine – plant interaction.

Topic 8 – Turbines: classification and analysis according to 1D approach for different reaction degrees. Discussion on optimisation parameters. Semi-empirical criteria for flow angle and losses prediction downstream subsonic and supersonic cascades. Blade loading criteria. Gas turbines: blade cooling, thermal aspects for cooled blade, aero-engine architecture.

Topic 9 – Computational schemes for Turbomachinery: lumped parameter approach, 1D-2D and 3D schemes, issues for unsteady solutions.

Topic 10 – Mechanical issues for Turbomachinery blades: periodic aerodynamic forcing, aero-elastic effects, flutter, mechanical damping.

 

Text books

Some texts are suggested but any text on the topics above reported can be used.

Comprehensive texts are:

1) M. Schobeiri, Turbomachinery Flow Physics and Dynamic Performance, Springler

2) E.A. Baskharoneprinciples of turbomachinery in air breathing engines, Editor: cambridge university press, edition: 2014, ISBN: 978-1-107-41740-3

Some topics can be found in Dixon S.L., Hall C. “Fluid Mechanics and Thermodynamics of Turbomachinery” Ed. Butterworth-Heinemann.

For fluid-dynamic basis: F. White “Viscous Fluid Flow” Mc Graw Hill.

For those who want to study in Italian: C. Osnaghi “Teoria delle Turbomacchine” Esculapio.

All slides shown and discussed during the course will be available on Beep.


Prerequisiti

Who is going to attend the course is expected to have rooted bases in mathematics, physics, thermodynamics and fluid mechanics, the latter both for compressible and incompressible flows.


Modalità di valutazione

Course structure and examinations

The course will offer lectures and exercises. Seminars, held by experts on some specific topics (different year by year) are also foreseen. On voluntary basis, few labs can be also attended.

Course attendance is warmly suggested. Students’ skills and knowledge will be evaluated by an oral exam and by a short project, the latter chosen on a voluntary basis.

In the oral exam, the student is expected to:

a) discuss and present the turbomachines operational laws

b) discuss and present the different design methodologies on a quality level

c) quantify the main analytical relationship describing the thermo-fluid dynamic processes occurring in turbomachines

d) apply the design criteria and methodologies: for those who does the design project this part consists in the design project discussion, for all the others a specific question will be asked in the oral exam.

e) show their ability in seeking new possible turbomachinery application thanks to an autonomous and self directed in-depth study

 

By the design project, soft skills in oral presentation and work group are enhanced and improved.

On a voluntary basis, few students could hold seminars on specific issues to the class in the frame of a flipped classroom methodology.

Depending on the class (Turbomachinery A – B, marked out by different credits) slightly different programs are foreseen:

  • Turbomachinery B: topics 1- 8. Aeronautical Eng. students: skip gas-dynamic recall. Energy Eng. students: skip thermodynamics recall
  • Turbomachinery A: topics 1-10

Bibliografia
Risorsa bibliografica facoltativaE.A. Baskharone, Principles of turbomachinery in air breathing engines, Editore: cambridge university press, Anno edizione: 2014, ISBN: 978-1-107-41740-3
Risorsa bibliografica facoltativaM. Schobeiri, Turbomachinery Flow Physics and Dynamic Performance, Editore: Springer
Risorsa bibliografica facoltativaDixon S.L., Hall C., Fluid Mechanics and Thermodynamics of Turbomachinery, Editore: Butterworth-Heinemann
Risorsa bibliografica facoltativaF. White, Viscous Fluid Flow, Editore: Mc Graw Hill
Risorsa bibliografica facoltativaC. Osnaghi, Teoria delle Turbomacchine, Editore: Esculapio

Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
65:00
97:30
Esercitazione
34:00
51:00
Laboratorio Informatico
0:00
0:00
Laboratorio Sperimentale
1:00
1:30
Laboratorio Di Progetto
0:00
0:00
Totale 100:00 150:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.5 / 1.6.5
Area Servizi ICT
19/09/2020