FLUID DYNAMIC DESIGN OF TURBOMACHINERY
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- Versione italiana
- Academic year
- 2022/2023
- Teacher
- ALESSIO SUMAN
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/08
Training objectives
- TThe aim of the course is the in-depth study of the issues concerning the physical knowledge, design and simulation of turbomachinery, with particular reference to the most widespread in the industrial field (pumps, fans, compressors).
Expected Learning Outcomes (AAR) are: - ability to manage the design of a turbomachinery, from customer specifications, to the initial concept, to obtaining a geometry and verifying it through virtual models; - knowledge of the numerical methodologies of analysis and specific design of turbomachinery; - ability to critically interpret the results obtained from the numerical simulation; - ability to synthesise the results and expose the results obtained in an oral paper; - propose solutions for the optimization of a turbomachinery. Prerequisites
- Knowledge of Termofluidodinamica Numerica e di Fluidodinamica Numerica applicata alla Macchine e ai Sistemi Energetici.
Basic knowledge of Fluidodinamica delle Macchine Course programme
- Introduction to the study of turbomachinery. Classification. Terminology. Velocity ¿¿triangles. Reference systems: cylindrical and meridian. Velocity ¿¿components in reference systems. Energy balances. Moment of momentum theorem. Euler's equation in its two forms. Similarity theory. Dimensional numbers. Specific speed and characteristic index.
Axial machine design. Two-dimensional aerodynamics (cascade) and aerodynamics of the profiles. Two-dimensional flow in axial machines. Axial turbomachinery design procedure.
Radial machine design. Type. One-dimensional approximation. Velocity ¿¿triangles. Slip factor. Stodola theory. Drawing of the blades and of the meridian channel. Head. Efficiencies: total, hydraulic, volumetric, disk friction, mechanical, prime mover. Procedure for the one-dimensional design of centrifugal machines with incompressible fluid.
Flows inside the turbomachinery: non-stationarity (Dean's theorem). Equations in relative frame of reference. Centrifugal and Coriolis forces, Rossby number. Blade loading. Velocity ¿¿distribution in the blade-to-blade and in the meridional channel. Numerical methods for rotor/stator interaction (SFR, MFR, Mixing Plane, Frozen Rotor, Transient).
Fluid dynamic phenomena: secondary flows and jet and wake. Fluid dynamic phenomena: leakage flows. Fluid dynamic phenomena: profile losses.
Radial impeller design and axial straightener. CFD laboratory: Impeller CAD modeling (radial blade). CAD modeling straightener (axial blade). Computational domain definition. Calculation grid generation. Simulation setup. Analysis of the simulation results. Didactic methods
- The course is equally divided between lectures and lab exercises. The laboratory exercise will involve the development of a turbomachinery project, from the initial concept to the numerical verification.
Learning assessment procedures
- The exam includes the production of a project presentation format (ppt) that will be discussed during the oral exam, followed by an open question on the theoretical topics of the course. The presentation will have a defined time (about 30 minutes) and will allow to evaluate the management capacity of a design process and the ability to critically interpret the results.
Reference texts
- Slide of the lessons.
Tutorial of the laboratory exercise.
Dixon, "Fluid mechanics, thermodynamics of turbomachinery"
Dossena et al., "Macchine a Fluido"
