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Energies 2020, 13, 2118 10 of 19 Figure 6. One-passage geometry of the radial outflow turbine. Table 3. Comparison of results between preliminary design and CFD. Μ ππ [kW] 4. Optimization of Velocity Triangles 4.1. Optimization Procedure Preliminary Design 400.0 85.0 1.47 91.5 0.0 CFD 379.87 84.66 1.43 87.9 0.7 Variables πππ‘π‘π‘π‘ [%] πππ π π‘π‘π‘π‘ [-] πΆπΆ2ππ [m/s] πΆπΆ3ππ [m/s] As turbines have a significant impact on the overall efficiency of the cycle, ORC developers have generally provided clear targets of turbine power and efficiency. If the performance of the actual turbine is better or worse than that required by the developer, the cycle efficiency may deteriorate as the operating conditions of the evaporator, condenser, and pump move away from the design condition. Hence, the designed turbine must meet the targets exactly. In this study, optimization was performed to satisfy the velocity triangle of each point and design goals suggested by the preliminary increase the tangential absolute velocity of the nozzle exit (πΆπΆ ), the blade angle of the nozzle exit the optimization. design program. The optimization process established in this study is shown in Figure 7. In order to 2ππ (πΌπΌ2ππ) was selected as an optimization variable. The other dimensions in Table 2 were not changed for Figure 8 shows the turbine power (ππΜ ) and the tangential absolute velocity of the nozzle exit (πΆπΆ2ππ) according to the blade angle of the nozzle exit (πΌπΌ2ππ). The turbine power (ππ) and the tangential absolute velocity of the nozzle exit (πΆπΆ2ππ) suggested by the preliminary design program are 400.0 kW and 91.5 m/s, respectively. 4.2. Optimization of the Radial Outflow Turbine ΜPDF Image | Analysis of a Radial Outflow Turbine for Organic Rankine Cycles
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