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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 10 of 18 performed to satisfy the velocity triangle of each point and design goals suggested by the preliminary design program. The optimization process established in this study is shown in Figure 7. In order to increase the tangential absolute velocity of the nozzle exit (C2θ), the blade angle of the nozzle exit (α2b) was selected as an optimization variable. The other dimensions in Table 2 were not changed for the optimization. Figure 7. Flow chart of optimization for the radial outflow turbine. 4.2. Optimization of the Radial Outflow Turbine . Figure 8 shows the turbine power (W) and the tangential absolute velocity of the nozzle exit . (C2θ) according to the blade angle of the nozzle exit (α2b). The turbine power (W) and the tangential absolute velocity of the nozzle exit (C2θ) suggested by the preliminary design program are 400.0 kW and 91.5 m/s, respectively. Figure 8. CFD results according to the blade angle of the nozzle exit (α2b). Looking at Figure 8, when α2b was 69.4◦, W. and C2θ were somewhat different from the design goals. However, at the fine-tuned 70.4◦, W. and C2θ were 398.57 kW and 92.4 m/s, respectively. Table 4 shows the comparison between the preliminary design results and the CFD results when the α2b was 70.4◦. The CFD results were very close to the preliminary design results.

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