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A. Preliminary Design The work leading up to this point has mostly been performed with the program ”Tur- bAero”. The design process which is conducted in ”TurbAero”, most often starts with the program ”RIFTSIZE”. It has already been described how the designer will return to ”RIFTSIZE” multiple times to check his or her design. In light of this, I thought it would be fitting to try to implement the equations in [2], which, according to Aungier, is the basis of ”RIFTSIZE”. The choice on platform fell on MATLAB and its build-in graphical user interface, ”GUI”. The main task of the program is to, with as little input parameters as possible and as fast as possible, construct a preliminary design of a radial turbine. This will help the designer to quickly get a candidate design which will come close to meet the performance requirements. Most of the equations are presented in chapter 3, however, the steps are not as thoroughly investigated as would be convenient if an attempt to redo this work were to be made. Because of this, I have chosen to present all the equations and steps which are conducted. This will also help in the process, in which possible errors can be corrected. The schemes which are used to numerically solve the equations that include differential terms will be presented. Also where it were required to used iteration loops, an explanation of how that was done is included. The program goes through the following steps. Initially the impeller tip is sized. The designer can then choose to use default values, which are presented below, to construct the rotor and stator geometry, or he can change the default values according to his own preferences. Finally the volute can be designed. If the incorporation of an exhaust diffusor is preferable, it is easily accomplished by the designer. In the following sections, I will go through each part which the program are consisting of. Impeller To initiate the design process, the designer is asked to specify the following input pa- rameters. The stage inlet total temperature and pressure, the stage mass flow, the stage total to static expansion ratio and the speed. Concerning the speed, he needs to choose 71PDF Image | A Detailed Analysis of Radial Turbines
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