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Total-to-total expansion ratio Figure 5.17.: The comparison of the total-to-total efficiency as a function of total- to-total expansion ratio for the preliminary (dots) and detailed design (squares). 5.3. Summary In this chapter an aerodynamic design of a radial turbine is developed. This is ac- complished in two steps. Initially a preliminary design is produced with the program ”RIFTSIZE”. The preliminary design is analyzed using a mean-line performance tool, ”RIFT”, and two blade-to-blade performance tools, ”Q3D” and ”TDB2B”. Based on those analyses the design is revised resulting in a detailed design. The preliminary design showed good off-design performance, however, from the blade-to- blade analyses it was possible to conclude that the velocity levels were not satisfactory. To remedy this, it was decided to change the blade angles and thickness distribution of the shroud and hub contours. The detailed design showed small improvement in off-design performance, however, the improvement of the velocity levels was extensive. Finally a comparison can be made with the real second turbine. When comparing the total-to-total efficiency, it can be seen that the real turbine is slightly better. It should be clear that the effort and time which was put to develop the real turbine do not even come close to the time and effort spent on the turbine presented in this chapter. It is, therefore, possible to argue that the design tool ”TurbAero” can be used to develop a good design in a relatively short amount of time with relatively small effort. 66 Total-to-total efficiencyPDF Image | A Detailed Analysis of Radial Turbines
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