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Appl. Sci. 2020, 10, 4168 11 of 26 b2=28.19 mm r2=254.7 mm b5=78.20 mm r5=121.8 mm r3=212.4 mm Z=117.3 mm r4=203.3 mm Figure 4. Meridional dimensions of selected turbine. The performance parameters obtained upon completion of 2D throughflow analysis for the turbine case are listed in Table 7. These results are obtained assuming inviscid flow. Table 7. Anticipated performance results. Variable Unit m ̇ kg/s W ̇ MW Total-to-total efficiency (ηtt) % Total-to-static efficiency (ηts) % νs - Stage loading (ψ) - φ - Degree of reaction (R) - Πts - 3.3. Computational Fluid Dynamics Analyses Value 354.6 101.6 88.25 83.40 0.344 1.42 0.433 0.282 5.52 Three-dimensional simulations are carried out for a single blade passage of the turbine to form a basis of obtaining performance results to be contrasted against lower-fidelity analysis techniques, and acquiring an insight into the turbine flow which can be used for comparison purposes with other designs (not presented in this paper), given that there is no available validation data for designs similar to the radial turbine under examination. 3.3.1. Mesh Sensitivity A mesh sensitivity study is performed to examine the relationship between computational time, which is related to total nodal count, and convergence of results. Two sets of boundary conditions definition are imposed to check discrepancies between mesh densities with results listed in Table 8. The largest observed changes refer to the efficiency values which can be imputed to improved wall boundary layer resolutions as number of elements increase.PDF Image | Radial Turbine Design for a Utility-Scale Supercritical CO2 Power
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