Selection of optimum degree of partial admission in a laboratory organic vapour microturbine

Abstract Partial admission is often used in small ORC turbines due to a relatively low value of specific speed parameter. The paper aims at elaboration of new modeling and design approach for low power ORC turbines with partial admission. The approach is tested on a 3 kW turbine for a small ORC CHP system built at the laboratory of the Institute of Fluid-Flow Machinery. The obtained new turbine is a modernized version of the machine that has been extensively tested before in the laboratory. First, a 0D correlation-based turbine design is presented and the results are discussed. The obtained turbine flowpath geometry is shown and described. Subsequently, a series of RANS simulations is performed in order to investigate the performance of the new design and to create a set of CFD-based flow loss correlations, depending on the blade height, tip clearance size and degree of partial admission. The obtained correlations are used to create a final and more accurate turbine design with the optimum degree of partial admission.

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