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as a starting point in the design is that in that it is possible to relatively quickly attain a reasonable design which later can be revised. The variables which are considered are the impeller inlet absolute flow and blade angles, the leading and trailing edge thicknesses, the hub and shroud outlet radius, the axial length of the impeller and finally the number of blades. While in ”RIFTSIZE” it is possible to include splitter blades, I have chosen not to implement that detail here. Whether the designer choice fall on using the default values or not the implementation is slightly different. I will present both approaches. Input variables according to default values The process of providing default values to the user takes on an initial stating of almost every input variable according to correlation taken from [2], except the inlet blade angle which has to be determined in an iterative manner taking the optimal incidence angle into account. Initially the flow angle is approximated using the specific speed (all angles are taken with respect to tangent). Then the leading and trailing edge thicknesses and the hub radius at the outlet are calculated as functions of the tip radius. α7 = 10.8 + 14.2Ns2 t7 = 0.04r7 t9 = 0.02r7 r9h = 0.185r7 (A.31) (A.32) (A.33) (A.34) The meridional velocity at the tip can be determined using the absolute flow angle and tangential velocity. Next it is possible to calculate the absolute velocity and afterwards the other flow conditions at the tip including the static temperature, pressure and density and the corresponding mach number. The cross sectional width is needed to calculate 77PDF Image | A Detailed Analysis of Radial Turbines
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