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The preliminary design performed in ”RIFTSIZE” can be updated to a detailed design. This can be seen in figure 5.1. Input files to a variety of programs can be exported from ”RIFTSIZE”. ”VOLUTE” is a program which sizes the volute. ”RIFTNOZ” is an equivalent program which sizes the nozzle. ”BEZIER”, ”GASPATH” and ”RIGPAC” are all programs which develop the geometry of the radial turbine. ”RIFT” is a mean-line performance program which can be used to generate off-design maps. From ”RIFT” it is possible to export an input file with flow conditions to a program called ”FLOW3D”. ”FLOW3D” uses a quasi-three-dimensional solver which supports end-wall and blade surface boundary layer calculations. The geometry can be supplied either from ”GAS- PATH” or ”RIGPAC”. In ”FLOW3D” flow calculations are performed and the output includes preliminary blade loading charts. The calculations performed in ”FLOW3D” can be updated in either ”B2B2D” or ”TDB2B”. They are program which perform blade-to-blade analyses. ”B2B2D” should be used when subsonic or slightly transonic conditions prevail. This is because it uses a potential flow solver. When supersonic conditions prevail the time-marching solver in program ”TDB2B” is much better suited. The computational time required for ”TDB2B” is a bit longer than for ”B2B2D”. Flow conditions Geometrical input Figure 5.2.: The programs used in TurbAero and the iteration process when con- ducting performance analyses on radial turbines. The working procedure when conducting performance analyses on existing radial tur- bines is a bit different from that of designing. The procedure was introduced in chapter four, however, a more in-depth view is given here. The programs used and in what manner they are used in is demonstrated in figure 5.2. The working fluid is composed and chosen in program ”RKMOD”. The geometry of the turbine is employed in pro- 53 RKMOD VOLUTE RIFTNOZ RIFT FLOW3D RIGPAC B2B2D TDB2BPDF Image | A Detailed Analysis of Radial Turbines
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