Turbocompressors and Pumps
- Bachelor, Master
Turbomachines play an important role in many parts of our lives. They are used to power almost all modern aircraft, in power generation, and are an important component in process industry plants. Hence, ever higher demands are being placed on efficiency, emissions and performance. In order to meet these challenges, an in depth understanding of the thermodynamics, aerodynamics and structural mechanics of turbomachinery is required.
The aim of the lecture “Turbomachinery Design” is to explain the basic physical relations that determine the design and operation of turbomachinery. The focus is on one-dimensional calculation methods in aerodynamics and structural mechanics, which are explained and applied.
At the beginning of the lecture, the typical industrial development process of an aircraft engine from pre-design to certification will be presented. Subsequently, the aero mid-section method will be used to show how velocities, angles and efficiencies of individual turbomachinery stages can be determined and optimized based on three dimensionless parameters. The derivation of single loss correlations forms a crucial part of this chapter.
In the next step, the design process is extended to the radial direction in order to be able to determine the velocities and angles over the entire channel height. The aerodynamic design is concluded in this lecture with the treatment of the through-flow method as a preliminary aerodynamic design tool. This applies the loss coefficients determined with the mid-section method to different streamlines.
At the end of the lecture, the structural-mechanical preliminary design is dealt with, in which the static and dynamic loads of the components are also estimated using analytical methods (e.g. beam theory methods).
- Development process of an aircraft engine
- Aero mid-section method
- Radial distribution
- Structural mechanical demands