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Abstract The field of radial turbines is wide and radial turbines of today find applications in areas as diverse as small gas turbines; turbochargers for cars, buses, and trucks, railway locomotives, and diesel power generators; cryogenic and process expanders; rocket engine turbopumps; and specialty steam turbines, [12]. The three-dimensional flow inside a radial turbine is complex and ever since the radial turbine was introduced on the market, a desire to model this flow with simple correlations and loss models has existed. This master thesis consist of two studies. In the first study two radial turbines are modeled on a mean-line basis and the performance of different operating conditions are simulated. The results are compared to test data to evaluate the accuracy of the simulations. In the second and final study an aerodynamic design of a radial turbine is conducted. Initially a preliminary design is considered. This design is evaluated with the same mean-line tool which were used to simulate the two turbines already mentioned and additionally a blade-to-blade tool. The preliminary design is revised, based on the evaluations, to a detailed design. The detailed design is evaluated with the same tools as the preliminary design and changed until it meets the requirements stated. The results from the simulations show good agreement with the test data and it can, therefore, be concluded that it would be possible to evaluate a new design using the mean-line tool used in this thesis. It is, however, naive to think that a mean-line analysis is able to predict the flow completely and thus the mean-line analysis should be viewed as a tool which is able to speed up the design process. It is difficult to judge the aerodynamic design from the second study because it would require for the turbine to be manufactured and tested. However, the design shows promise according to the one- and two-dimensional analyses preformed. iiPDF Image | A Detailed Analysis of Radial Turbines
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