Internal Flow of Contra-Rotating Small-Sized Hydroturbine at Maximum Efficiency Flow Rate

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Other Title
  • 二重反転形小型ハイドロタービンの最高効率流量点における内部流れ
  • ニジュウ ハン テンケイ コガタ ハイドロタービン ノ サイコウ コウリツ リュウリョウテン ニ オケル ナイブ ナガレ

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Abstract

Small hydropower generation is one of important alternative energy, and potential of small hydropower is great. Efficiency of small hydro turbines is lower than that of large one. Then, there are demands for small hydro turbines to keep high performance. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance. In this research, experimental apparatus of the contra-rotating small hydro turbine with 60 mm casing diameter was manufactured and performance of it was investigated by an experiment. Efficiency of the contra-rotating small hydro turbine was high in pico-hydro turbines and high efficiency could be kept in wide flow rate range. Unsteady internal flow conditions, which were difficult to measure experimentally, were shown by the numerical flow analysis. Further, pressure distributions and wake interactions with a rotor rotation were clarified. Then, a relation between the performance and unsteady internal flow condition was considered by the experimental and numerical analysis results.

Journal

  • Turbomachinery

    Turbomachinery 43 (4), 236-243, 2015

    Turbomachinery Society of Japan

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