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Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

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  • Ding Nan

    (School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8506, Japan)

  • Toru Shigemitsu

    (Institute of Science and Technology, Tokushima University, Tokushima 770-8506, Japan)

  • Shengdun Zhao

    (School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

At present, there is strong impetus for renewable energy to replace the traditional energy sources because of the environmental pollution. Small hydropower is a promising renewable energy source; however, small hydro-turbines easily become blocked and impacted, and the efficiency of such devices is lower. Therefore, we examined contra-rotating rotors to overcome these disadvantages. We have made modifications to the blade thickness and to the front hub of the original model. In this paper, we focus on the attack angle and rear flow condition of the original model and the modified one. The axial and circumferential velocities are given as outputs, from which the attack angle is then calculated. The results show that the attack angle of new model is smaller at the hub area. The stagnation point of the rear rotor was moved slightly to the pressure surface of the rear blade, and the separation at leading edge area was suppressed. The crowed flow at the tip clearance area is also reduced. The high turbulent kinetic energy area is moved forward to the middle of the blade. The rear rotor’s torque is bigger and changes more smoothly. Therefore, the rear flow conditions of the new model are improved.

Suggested Citation

  • Ding Nan & Toru Shigemitsu & Shengdun Zhao, 2018. "Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine," Energies, MDPI, vol. 11(7), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1806-:d:157259
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    References listed on IDEAS

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    1. Gabl, Roman & Innerhofer, Daniel & Achleitner, Stefan & Righetti, Maurizio & Aufleger, Markus, 2018. "Evaluation criteria for velocity distributions in front of bulb hydro turbines," Renewable Energy, Elsevier, vol. 121(C), pages 745-756.
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    3. Angus C. W. Creech & Alistair G. L. Borthwick & David Ingram, 2017. "Effects of Support Structures in an LES Actuator Line Model of a Tidal Turbine with Contra-Rotating Rotors," Energies, MDPI, vol. 10(5), pages 1-25, May.
    4. Christopher A. Scott & Zachary P. Sugg, 2015. "Global Energy Development and Climate-Induced Water Scarcity—Physical Limits, Sectoral Constraints, and Policy Imperatives," Energies, MDPI, vol. 8(8), pages 1-15, August.
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    Cited by:

    1. Xiaoling Wang & Hongling Yu & Peng Lv & Cheng Wang & Jun Zhang & Jia Yu, 2019. "Seepage Safety Assessment of Concrete Gravity Dam Based on Matter-Element Extension Model and FDA," Energies, MDPI, vol. 12(3), pages 1-21, February.
    2. Daniel Biner & Vlad Hasmatuchi & Laurent Rapillard & Samuel Chevailler & François Avellan & Cécile Münch-Alligné, 2021. "DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks," Sustainability, MDPI, vol. 13(19), pages 1-26, September.

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