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are possible). When the aerodynamic analysis is performed, structural simulation re- viewing the mechanical and thermal stresses that the turbine will be exposed to has to be performed. This analysis is just as important as the aerodynamic analysis and can often force the designer to rethink and change the design. Finally the auxiliary systems needs to be incorporated. These can for example consist of systems for cooling, valves and ducts. It should be stressed that these systems together with the structural analysis can form obstacles which might be impossible for the designer to overcome. This results in the process having to be restarted. In this thesis only the aerodynamic analysis is reviewed and the theory presented concerns only that part of the design process. In the one-dimensional stage, performance analysis are conducted at the inlet and outlet of each component (volute, nozzle, impeller, diffusor and vaneless spaces). This analysis is made using thermodynamic and aerodynamic principles and relations and to some extent models to predict the losses which occurs. The outcome from this simple analysis are predictions of some geometrical parameters, such as radii, blade angles, section width and axial length, at the inlet and outlet for the various components. It is also possible to determine the flow conditions at one certain design point and to some extent predict performance at points dissimilar from the design point. The one-dimensional analysis is performed on a single streamline, a mean-line, situated in the center as can be seen in figure 2.8. 3 8 4 5 6 7 10 9 Figure 2.8.: In one-dimensional analyses a mean streamline is used. Calculations are performed on this streamline at the inlet and outlet of each component A two-dimensional approach includes several streamlines. This is often called a blade- to-blade analysis. Even though the flow in a radial turbine is strongly affected by three-dimensional effects a blade-to-blade analysis helps in understanding the basic aero- dynamics of the flow. It can be used to analyze flow condition in a range not far away 11PDF Image | A Detailed Analysis of Radial Turbines
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