Mean-Line Design of a Supercritical CO2 Micro Axial Turbine

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Mean-Line Design of a Supercritical CO2 Micro Axial Turbine ( mean-line-design-supercritical-co2-micro-axial-turbine )

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Appl. Sci. 2020, 10, 5069 14 of 20 (a) (b) Figure 9. Rotor rotational speed versus the inlet blade height and mean diameter at (a) 0.5 degree of reaction (b) zero degree of reaction; blade height [b2] is represented by the solid lines and diameter [d] is represented by the dashed lines. A comparison between two turbine designs, to depict the effect of the selected design variables on the final turbine geometry, is presented in Figure 10. Geometry (A) is obtained at Λ = 0.5, ψ = 1.6 and φ = 0.2, while geometry (B) is obtained at Λ = 0.0, ψ = 3.0 and φ = 0.2 at 150 kRPM. Reducing the degree of reaction and increasing the loading coefficient results in more feasible design dimensions (Design B). Figure 10. Comparison between two turbine designs at: (A) ψ = 1.6, φ = 0.2 and Λ = 0.5; and (B) ψ = 3.0, φ = 0.2 and Λ = 0.0. 6. Conclusions This paper has presented the design of a small-scale single-stage 100 kW axial turbine for implementation within a supercritical carbon dioxide power system. The performance of the turbine was evaluated by introducing Soderberg’s and Ainley and Mathieson’s loss correlations in the design model. To verify the developed model, it was cross checked with published results for a larger turbine

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