Research Article
Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes
Table 1
Design specifications of the reference design.
| | Diameter of blade (mm) | 150 | Tip clearance (mm) | 0.5 | | Pump mode efficiency (%) | 77.03 | Turbine mode efficiency (%) | 81.26 | | Designed mass flow rate at pump mode (m3/h) | 93.51 | Designed mass flow rate at turbine mode (m3/h) | 85.98 | | Total rotational speed at pump mode (r/min) | 2,463 | Total rotational speed at turbine mode (r/min) | 1,675 | | Number of blades (front impeller/rear runner) | 5 | Number of blades (rear impeller/front runner) | 4 |
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