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gram ”RIGPAC”. All the geometry variables can either be inserted manually or im- ported using a simple text file. The geometry is then exported to programs ”RIFT” and ”FLOW3D”. The flow conditions are specified in ”RIFT”. Together with the geometry imported from ”RIGPAC” it is possible to simulate mean-line performance analyses in ”RIFT”. In this way full off-design maps can be constructed. If one operating point is chosen, further performance evaluation can be performed in program ”FLOW3D”. The geometry is imported from ”RIGPAC” and it is possible to achieve preliminary blade loading plots. These blade loading plots can then be updated in either program ”B2B2D” or program ”TDB2B”. The program chosen is depending on the component mach-number value. To have any qualitative meaning, this study needed to take on some delimitation. It was decided that to define the design point, the input data from the second radial turbine, described previously, should be used. From tests of the second radial turbine it was concluded that the turbine was too large. It was decided, therefore, to make an effort to let the new design be smaller. Initially a preliminary design resulting from a mean-line analysis is conducted. This preliminary design is then analyzed with one- and two-dimensional tools. As mentioned before the preliminary design would most certainly have to be updated in a detailed design making the design procedure iterative. 5.1. Preliminary design Design in RIFTSIZE The preliminary design starts in the program ”RIFTSIZE”. Since the only parameter which is not specified is the speed, the geometry of the impeller tip will depend solely on it. It was mentioned earlier that either the rotational speed or the specific speed can be used and that they are functions of each other. In this case the specific speed is chosen to specify the geometry of the impeller tip. According to Aungier [2], the specific speed should be in the range of 0.45-0.75. The highest possible efficiency to be attained in ”RIFTSIZE” is achieved with a specific speed of 0.55. This gives a total to static efficiency of 0.87. Unfortunately the radius of the impeller tip is then estimated to 66.4 mm. To achieve a reasonable radius, which in this case means lower, it is necessary to increase the specific speed to 0.77. This gives a lower radius of the impeller tip. The next step in the preliminary design is to size the impeller. In this case the default settings are chosen. They are summarized in table 5.1 and derived in the appendix. It 54PDF Image | A Detailed Analysis of Radial Turbines
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