Politecnico di Torino
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Politecnico di Torino
Academic Year 2016/17
01PESMT
Computational fluidodynamics of propulsive systems/Turbomachinery fluid dynamics
Master of science-level of the Bologna process in Aerospace Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Larocca Francesco ORARIO RICEVIMENTO AC ING-IND/07 35 25 0 0 10
Larocca Francesco ORARIO RICEVIMENTO AC ING-IND/07 40 20 0 0 10
SSD CFU Activities Area context
ING-IND/06
ING-IND/07
ING-IND/07
6
5
1
B - Caratterizzanti
B - Caratterizzanti
F - Altre attivitą (art. 10)
Ingegneria aerospaziale ed astronautica
Ingegneria aerospaziale ed astronautica
Abilitą informatiche e telematiche
Subject fundamentals
Object of the course is the description of the main aspects related to the design and the analysis of aerospace propulsion components .
It is primarily intended to the study of internal flows, to the description of the main analytical, empirical and computational tools needed for the aerodynamic analysis/design of such components.
The attention is focused, on the one hand, to turbomachinery fluid dynamics, with particular attention to the axial compressor, and secondly, to techniques of numerical simulation of internal flows on inlets, nozzles and turbomachinery blade profiles.
Expected learning outcomes
Capacity for analysis and preliminary design of turbomachinery blade rows.
Capacity for critical interpretation of numerical simulations of internal motion in propulsion systems.
Prerequisites / Assumed knowledge
Thermodynamics, fluid mechanics. Elements of propulsion. Elements of numerical computation and programming.
Contents
MODULO COMPUTATIONAL FLUID DYNAMICS OF PROPULSION SYSTEMS Francesco Larocca
- Elements of compressible inviscid/viscous flow.
- Conservative and quasi-linear formulations of the governing equations.
- Numerical approximation of steady supersonic flow fields.
- Numerical approximation with t ime-dependent technique for
steady subsonic and transonic flow fields.
- Analytical and numerical grid generation.
- Internal flows in air intakes, nozzles and blade rows.

MODULO TURBOMACHINERY FLUID DYNAMICS Luca Zannetti
Velocity triangles. Impulsive theory: forces acting on cascade profiles. Analytical solution for potential flow. Experimental features of cascade. The phenomenon of a stall. The Howell correlation: problems of analysis and design. NACA experimental data. Effects due to compressibility: critical Mach, maximum Mach, choking, their dependence on incidence. Compressor stage axial load factor, flow coefficient, degree of reaction. Thermodynamic evolution of a gas through a stage of an axial compressor. Effect of degree of reaction on the stall in low and high speed. Quasi-3D approximation. Radial equilibrium: design and analysis problems. Secondary flows. Rotating stall, surge. Supersonic flow: shocks and expansions at leading and trailing edges, unique incidence..
Delivery modes
MODULO DI FLUIDODINAMICA SISTEMI PROPULSIVI Francesco Larocca
Development of a computational program for the numerical simulation of the flow in nozzles and / or two-dimensional cascade.

MODULO DI FLUIDODINAMICA DELLE TURBOMACCHINE Luca Zannetti
Nomenclature of cascade. Analytical evaluation of potential flow in cascade of flat plates. Assessment of viscous effects according to the experimental correlation of Howell. Design of a multistage axial compressor. Quasi-3D design of a single compressor stage. 2D supersonic jet. Unique incidence according to the method of Levine.
Texts, readings, handouts and other learning resources
- Notes and teaching materials will be provided during the lectures.
- J. H. Horlock, Axial FlowCompressors, Butterworths Sc. Pubbl. London
- M.H.Vavra, Aero- thermodynamics and flow in turbomachines - Wiley, New York.
- C. Hirsch: Numerical Copmutation of internal and external flows, John Wiley & Sons
- M.J. Zucrow,J.D. Hoffman: Gas Dynamics, John Wiley & Sons
Assessment and grading criteria
The exams are oral for each module. The candidates will be asked to discuss the topics covered during class and tutorials.

Programma definitivo per l'A.A.2016/17
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