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Energies 2020, 13, 2118 14 of 19 6.3. Total-to-Static Efficiency (𝜂𝜂𝑡𝑡𝑡𝑡) versus Loading Coefficient (𝜓𝜓) and Flow Coefficient (𝜙𝜙) Figures 12 and 13 are the performance curves according to the loading coefficient (𝜓𝜓) and the flow coefficient (𝜙𝜙). The ranges of loading coefficient and flow coefficient showing high efficiency over 85% are 0.85–1.30 and 0.34–0.41, respectively. The loading coefficient and the flow coefficient of the turbine obtained in the preliminary design were 0.87 and 0.34, respectively. CFD results obtained from the final geometry of the turbine have a loading coefficient of 0.86 and flow coefficient of 0.34, and the values of each dimensionless variable are almost identical. Figure 12. Total-to-static efficiency according to the loading coefficient (𝜓𝜓). Figure 13. Total-to-static efficiency according to the flow coefficient (𝜙𝜙). In Figures 12 and 13, A corresponds to the design condition and the operating condition that can expect high efficiency. When the operating conditions are directed to B, the efficiency drops gently. On the other hand, if the operating conditions are directed to C, the efficiency drops sharply. Figures 14–16 show the streamlines around the rotor blade when the operating conditions are A, B, and C, respectively. At the A point, the inlet flow almost flows along the shape of the rotor blade (Figure 14). At the B point, the inlet flow is directed toward the pressure side of the rotor blade (FigurePDF Image | Analysis of a Radial Outflow Turbine for Organic Rankine Cycles
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