曲がり吸出し管内旋回流の時間平均的フローパターンと圧力回復

概要

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Previous investigations on the flow in diffusers suggest that study on the flow characteristics in the elbow draft tubes of Francis turbines, especially in the case of strong swirling flow involved, is still required. As one of the steps to investigate the surge phenomena in the elbow draft tubes, we carried out a series of time-averaged measurements in a conventional draft tube, which was installed in an air test rig, by using a five-hole probe. Flow pattern and pressure distributions in the draft tube were studied in the range of swirl rate m_<ex> from 0 to 1.8. The variations of area-mean pressure and mass-averaged pressure at each measuring section are discussed, and the effect of swirl rate m_<ex> on the pressure recovery coefficients of a typical draft tube is also shown.
社団法人日本機械学会の論文
1994-03-25