The paper deals with the CFD simulation and investigation of an axial Micro-ORC-Turbine, running with the working fluid hexamethyldisiloxane (MM). The CFD results are compared to the experimental results of the turbine, which were determined at the Center of Energy Technology at the University of Bayreuth. The simulation software Fine/Turbo by NUMECA was used for the meshing and simulation of the turbine. After the mesh studys and optimization of the geometry grid have been carried out, different pressure ratios and rotational speeds have been simulated. The simulated efficiency maps were compared to the experimentally determined efficiency maps. The simulated efficiency characteristics show principally a very similar turbine operating behavior to the measured ones. However, the simulated efficiencies are about 2 to 3 percentage points higher than the measured data. Through the detailed analysis of the blade-to-blade flow fields, it was possible to plausibly trace the integral course of the efficiency curves. Thus, CFD turbine flow simulation proved to be a valuable tool to predict the efficiency characteristics of a Micro-ORC-Turbine.

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