Final Optimized Design Sample Clauses

Final Optimized Design. From the analysis of the previous design iterations, a good improvement in stage efficiency is seen in both modes of operation though the second rotor is limiting the performance especially at high flow in pump mode. The second rotor is modified to increase the throat area by ~11%. This helped in shifting the peak efficiency of the second rotor to a higher flow rate in line with the first rotor and has helped in improving overall stage performance. The detailed performance plot comparison of the final design with the baseline design is presented in Figure 8 and Figure 9. A significant improvement in performance is noted in both pump and turbine mode across the operating ranges analysed. Compared with the baseline, the second rotor contributed the most towards improvement in both modes of operation. First rotor showed improvement in pump mode over the baseline while the baseline design has slight advantage in turbine mode; nevertheless the efficiency is still at a very high level for the Rotor1 of the optimized design. Figure 8 : Performance curves in pump mode - Baseline (solid lines) vs Optimized design (dotted curve) Figure 9 : Performance curves in turbine mode - Baseline (solid lines) vs Optimized design (dotted line) The stage efficiency is largely improved by the optimisation procedure. The average efficiency across the operational range is increased by more than 7.7 percentage points in pump mode, and 2.8 percentage points in turbine mode. The flatness of the efficiency curves also provide a better characteristics of the machine since one of the main goals of the ALPHEUS project is to produce a machine that has a broad operational range rather than a peak operation point. The efficiency curve in turbine mode is almost completely flat with an efficiency close to 90% for heads of 6 - 10 m. Pump mode also did not show much drop from the peak efficiency across a wide range. A comparison of the optimized design geometry with baseline is shown in Figure 10. Figure 10 : Geometry comparison - Optimized Design (blue color) vs Baseline A comparison of velocity vector plot at 15% span at 420 kg/s in pump mode in Figure 11 shows that separations and recirculations downstream of each rotor is considerably reduced. At higher span locations as well optimized design has a better flow incidence compared to baseline. Surface streamline plots in Figure 12and Figure 13for Rotor1 and Rotor2 shows that the streamlines are well aligned for the optimized design and the inf...
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