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Turbomacchine
Turbomachinery
Leonardo Pelagalli

Seat Ingegneria
A.A. 2016/2017
Credits 6
Hours 48
Period II
Language ENG

Prerequisites
Concepts of Technical Physics, Fluidynamics and Machines and Energetic Systems.

Learning outcomes
KNOWLEDGE AND UNDERSTANDING:
The course provides the students with an advanced knowledge of main thermofluid dynamics phenomena that drive the operation of turbomachines. In this way, students deepen their knowledge in the field of fluid/energy machines
CAPACITY TO APPLY KNOWLEDGE AND UNDERSTANDING:
Students must be able to carry out a preliminary design of turbomachines such as turbines and compressors. The main skills acquired in the course are: 1. Ability to plan all the steps for the modeling and the design of turbomachines; 2. Ability to assess the performance of a turbomachine; 3. Ability to properly choose a turbomachine in relation to the application context
TRANSVERSAL SKILLS:
The knowledge in the field of turbomachines will improve the ability of students to develop autonomous judgement during the design phase so that they can be able to discuss with specialist with different expertise

Program
Fludynamic equations for the flow of a non-reacting, compressible and uncompressible, steady and unsteady, viscous and inviscid perfect fluid. Reference systems. Normal shocks. Quasi-one dimensional flow. Nozzles and diffusors. Viscous and adiabatic one dimensional flow (Fanno flow). Heat exchanging inviscid flow (Rayleigh flow). Axial compressors and turbines. The fluidynamic analysis of the stage. The reaction grade. Blade profiles and cascades. Fluidynamic losses and deviation angles. Experimental and numerical methods for the performance previsions. Efficiency. The performance curves. Off design performance for a single and twin-shaft gas turbine.

Development of the examination
LEARNING EVALUATION METHODS
The assessment of the level of learning and understanding consists of two parts: 1 - written test containing four questions related to the topics covered in the lectures 2 - oral clarification and/or deepening of the themes of the written test, if necessary, by adding an additional problem of theoretical and/or application nature.

LEARNING EVALUATION CRITERIA
The student has to demonstrate to have understood and acquired the physical principles and theoretical considerations on the basis of turbomachinery running with the addition of a valid competence regarding the construction configurations and nominal operating conditions and in the regulation phase. The responses also include the quantitative knowledge of the topic.

LEARNING MEASUREMENT CRITERIA
The student knowledge is graded through the attribution of a final mark out of thirty. The passing score is 18/30, the highest score is 30/30, brilliant students may receive in addition a praise. The final evaluation results from the weighted average of the pre-trial written examination (25%) and oral (75%). To pass the exam both tests should be sufficient.

FINAL MARK ALLOCATION CRITERIA
In order that the final outcome of the evaluation is positive, the student will have to prove that he has no gaps on basic skills covered in the course. The highest rating is achieved by demonstrating in-depth knowledge of the course content. Praise is given to students who, having done the pre-exam and oral fairly and with good level of detail, have also shown a particular brilliance in exposure and/or have demonstrated particular mastery of the material knowing also the use of the acquired skills to analyze topics not explicitly covered or treating the topics in a way alternative to the proposed one.

Recommended reading
- Lecturer's notes - Cohen, H., Rogers, G.F.C., Gas Turbine Theory, Longman Scientific Technical - Sandrolini, S., Naldi, G., Le turbomacchine motrici e operatrici, Pitagora Editrice-Bologna - Sandrolini, S., Naldi, G., Macchine - Gli impianti motori termici e i loro componenti, Pitagora Editrice-Bologna

Courses

• Ingegneria Meccanica (Corso di Laurea Magistrale (DM 270/04))