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1.4. Methodology This work is based mainly on the theory presented by R.H. Aungier, [2], and all the modeling and simulations are performed with his tool ”TurbAero”3. The theory included in this thesis governs performance analyses on a mean-line basis. Also some examples and guidelines for preliminary design are presented. The program ”RIFT” is used for all performance simulations. Every component of the radial turbine is modeled using geometry from three stations on a mean-line basis. Calculations are performed on every station which yield the flow conditions. The program ”RIFTSIZE” is used in chapter five to develop a preliminary stage design for the aerodynamic design. It uses empirical correlations together with one-dimensional physical equations. The program ”TDB2B” is used to perform blade-to-blade analyses. It is mainly used as an evaluation tool for the detailed design. 1.5. Outline Chapter one gives a brief introduction to the subject. In chapter two more information about radial turbines in general is given together with an explanation of the different strategies for design which exist. The work is divided into a theory part and an objective part. Chapter three is focused on the theory and here are the equations and models which are used in the programs explained. This is done because it makes it possible to realize the limitations of the programs and to better understand how the results appear. In the section which concerns the aerodynamic design of a radial turbine, programs will be handled which make use of two-dimensional theory. Because those programs are used to a very small extent, the two-dimensional theory governing them is not investigated in this thesis. The objective part consists of two chapters. The fourth chapter of this thesis presents the simulations which are performed on two different radial turbines, designed by Volvo Powertrain AB. The simulations aim to predict the off-design performance of the tur- bines. The fifth chapter presents an aerodynamical design of a radial turbine. Initially a preliminary design is produced using simple correlations. This design is revised to a de- tailed design which is analyzed using a blade-to-blade tool. Although, it was not meant 3”TurbAero” includes a number of programs. It is an aerodynamic design and analysis software system for axial-flow and radial-inflow turbines. 3PDF Image | A Detailed Analysis of Radial Turbines
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