Off-Design Analysis of a Radial Outflow Turbine for ORC

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Off-Design Analysis of a Radial Outflow Turbine for ORC ( off-design-analysis-radial-outflow-turbine-orc )

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Energies 2020, 13, 2118 15 of 18 Figure 15. Streamline of the rotor blade (B point). Figure 16. Streamline of the rotor blade (C point). Table 8 shows the incidence angle (i) and more specific information of each operating condition. The incidence angle of the rotor at the A point is 2.3◦, so there is no significant difference between the blade angle of the rotor inlet (β2b) and the flow angle (β2). The B point has an incidence angle of 32.9◦, which means that the rotor inlet flow faces the pressure side excessively. Meanwhile, the C point has an incidence angle of −20.8◦, and its flow is overly directed to the suction surface. Table 8. Information on the main points of the performance curves according to dimensionless variables. Point ψ φ ηts i1 Remark A point B point C point 0.86 0.34 1.66 0.48 0.34 0.26 85.13% 81.90% 71.28% 1 i = β2 − β2b. 2.3◦ 32.9◦ −20.8◦ toward the pressure side toward the pressure side toward the suction side Figure 17 shows the pressure distribution between the pressure side and the suction side of the design point (A point) and the lowest efficiency point (C point). As a result, the A point shows an appropriate pressure distribution along the radial direction, but the C point shows an inappropriate pressure distribution on the pressure side and the suction side. Looking at the pressure distribution for the C point, there is an area where the pressure on the suction side is higher than the pressure on the

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