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Hydrodynamic screw parameter optimization for maximum power output


Considering the limited amount of fossil fuels, the use of small-scale renewable energy generators has been promoted in various regions. One of the tools for small-scale power generation is the hydrodynamic screw, known as a floating turbine, which can convert the potential and kinetic energy of water into mechanical energy. In this paper, an investigation on the conditions of hydrodynamic screw as Archimedes screw turbine for electricity generation in laboratory scale is presented. For this purpose, two different screws were fabricated and used to achieve the optimum conditions for power generation as laboratory samples. A central composite design, the most commonly used approach from resource surface methodology, was developed to improve the modeling and reduce the number of laboratory tests for the input data of the simulation model developed via Design Expert software. Design Expert software was used to calculate optimized points for each bolt considering the experimental results. The results indicated that a higher number of blades with a shorter pitch, together with an increased number of trapped buckets between two consecutive blades, could have a direct impact on the optimal performance of the turbines. The results of optimized points indicated that by setting the discharge value on 5.64 L/s and the screw installation slope on 28.49°, the power was calculated to be 66.71 W for screw no. 1. This parameter was found to be equal to 12.96 W for screw No. 2, when the flow rate value and the screw installation slope were set on 7 L/s and 32.74°, respectively. Finally, the results of the simulation were validated in the laboratory and found to be acceptable considering ‏ ± ‏ 5% error value. Our findings indicate that both physical factors—such as pitch of blades and number of blades—and environmental factors—such as the slope of installation and discharge volume—can significantly affect the energy generation.

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Data availability

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.


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The authors would like to express their thanks to Dr. A. M. Zahedi for his dedication during the course of this research.

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Correspondence to H. Eskandariun.

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Eskandariun, H., Noorollahi, Y., Ghobadian, B. et al. Hydrodynamic screw parameter optimization for maximum power output. Int J Energ Water Res (2021).

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  • Hydrodynamic screw
  • Hydropower turbine
  • Laboratory scale
  • Optimization
  • Renewable energy