Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes

In this study, a counter-rotating-type pump-turbine unit was optimized to improve the pump and turbine mode efficiencies simultaneously. Numerical analysis was carried out by solving three-dimensional Reynolds-averaged Navier–Stokes equations using the shear stress turbulence model. The hub and tip...

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Bibliographic Details
Published in:International journal of rotating machinery 2018-01, Vol.2018 (2018), p.1-12
Main Authors: Kanemoto, Toshiaki, Lee, Kyoung-Yong, Choi, Young-Seok, Suh, Jun-Won, Kim, Jin-Woo, Kim, Jin-Hyuk
Format: Article
Language:English
Subjects:
Climate change
Computational fluid dynamics
Design optimization
Design specifications
Efficiency
Electric power
Energy
Finite volume method
Flow velocity
Fluids
Hydraulics
Hypercubes
Latin hypercube sampling
Low flow
Mathematical models
Mechanical engineering
Navier-Stokes equations
Neural networks
Numerical analysis
Reynolds averaged Navier-Stokes method
Sensitivity analysis
Shear stress
Steady flow
Studies
Three dimensional models
Turbines
Turbulence
Turbulence models
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Summary:In this study, a counter-rotating-type pump-turbine unit was optimized to improve the pump and turbine mode efficiencies simultaneously. Numerical analysis was carried out by solving three-dimensional Reynolds-averaged Navier–Stokes equations using the shear stress turbulence model. The hub and tip blade angles of the rear impeller (in the pump mode) were selected as the design variables by conducting a sensitivity test. An optimization process based on steady flow analysis was conducted using a radial basis neural network surrogate model with Latin hypercube sampling. The pump and turbine mode efficiencies of the unit were selected as the objective functions and they combined into a single specific objective function with the weighting factors. Consequently, the pump and turbine mode efficiencies of the optimum design increased simultaneously at overall range of flow rate, except for low flow rate of turbine mode, compared to the reference design.
ISSN:1023-621X
1542-3034
DOI:10.1155/2018/6069780