Subject: TURBO- MACHINERY FOR CHARGING AND AUXILIARY IN AUTOMOTIVE APPLICATIONS (A.A. 2021/2022)
Unit Turbo- Machinery for Charging and Auxiliary in Automotive Applications
To be chosen by the student (lesson)
Knowledge and understanding of the working principles of the turbomachines which can be found in a vehicle (turbocompressors, pumps, fans), both from a thermodynamic and fluid dynamic point of view. Competence in the development of a design.
Fundamentals of fluid dynamics and fluid machinery
The course will address the main issue in charging and auxiliary in automotive applications. The main topics covered will be essentially:
Definition and classification of turbomachines. Coordinate systems. Velocity components. Velocity triangles. Compressible flow relations. Stagnation properties.
Fundamental laws: continuity, energy, momentum, moment of momentum. Euler equation. Rothalpy. Dimensional analysis: incompressible. Dimensional analysis: compressible. Perfomance maps. Specific speed. Specific diameter.
Axial machines. Cascade aerodynamics. Aerodynamic profiles. Lift and drag. Weinig diagram.
Fans for cooling. Design procedure for axial fan. Design application.
Radial machines. Definitions and geometries. One-dimensional approximation. Velocity triangles. Slip factor. Blade design: single arc, double arc, point-by-point. Kaplan representation.
Pumps for cooling. Definition of head, power and efficiencies (hydraulic, volumetric, disk friction). Design procedure. Design application.
Compressor for charging. Design procedure. Design application. Ferrari Corse seminar.
The course consists mainly of theoretical lectures. Practical exercises, demonstrations and thematic seminars concerning the modeling and the practical use of turbomachinery will be provided. During the course the students will carry out exercises in which the students will test themselves in the design of three turbomachines: an axial fan, a centrifugal pump and a centrifugal compressor. The expected products are a technical report presenting the project results.
The exam includes both a written and an oral test. The written test is based on open questions, for testing the knowledge of the course content. One or more numerical exercise could be inserted into the text. The oral exam will deal with the comments and the deepening of the written test.
Knowledge and understanding: through lectures and technical seminars by specialists, students learn the methods and techniques for turbomachinery design
Applying knowledge and understanding: through the project work and practical exercises, students learn how to apply the gained knowledge.
Making judgments: through the engineering project development and the discussion with the teacher, students develop the ability to integrate knowledge and handle complexity.
Communication skills: through the project work, students will develop the ability to critically communicate, especially using the engineering technical language.
Learning skills: the activities described allow students to develop the skills necessary to autonomously deepen technical topics, in order to effectively face professional challenges or to undertake further studies.
Baines, “Fundamentals of Turbocharging”, 2005, Concepts NREC
Watson, Janota, “Turbocharging the Internal Combustion engine”, 1982, The Macmillan Press
Dixon, Hall, “Fluid Mechanics and Thermodynamics of Turbomachinery”, 2014, Pergamon Press