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Numerical computations of the unsteady flow in a radial turbine

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Numerical computations of the unsteady flow in a radial turbine ( numerical-computations-unsteady-flow-a-radial-turbine )

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60 7. PAPERS AND AUTHORS CONTRIBUTIONS Paper 3 Effects of inlet conditions on the turbine performance of a radial turbine. F. Hellstrom & L. Fuchs. Submitted to ASME Turbo Expo 2008: Power for Land, Sea and Air June 9-13, 2008, Berlin, Germany. In this paper the effect of the different perturbations on the performance of a radial nozzle-less turbine is assessed and quantified by using Large Eddy Simulations. Five different cases are considered, where the base case has a non-disturbed velocity profile applied at the inlet. The other cases has 3- dimensional turbulence added to the velocity profile. Three of the cases has also different secondary flow structures added at the inlet. The turbine perfor- mance is compared for the different cases and the flow field is investigated to give a better insight into the unsteady flow field and the effects from the differ- ent inlet conditions. The work was performed by Hellstrom under supervision by Prof. Fuchs. The paper is submitted to ASME Turbo Expo 2008: Power for Land, Sea and Air June 9-13, 2008, Berlin, Germany.

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