Analysis of the pressure-ratio lines for a radial turbine

TL;DRAbstract

This paper focusses on the properties of the pressure ratio lines in the performance map, expressed in laod-flow coefficient axis, of a radial turbine stage for which numerical simulations were conducted and compared to available experimental data. The first part of the paper recalls the theoretical frame of the one-dimension analysis supporting this work. A second part presents the reference turbine stage, the numerical tools and the CFD approach.The last part details the results and the analysis of the influence of the different parameters defined during the one-dimension analysis on the measured and computed pressure-ratio line. The modelisation presented and the hypothesis related to the non-variation of reduced sections, total-to-static stage efficiency or total-to-static exit pressure ratio have been validated. Therefore, the strong influence of the variation of the static wheel pressure ratio on the slope of the lines remains unpredicted.

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