The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Effect of Nozzle Shape on the Performance and Internal Flow of a Cross-Flow Hydro Turbine

횡류수차 노즐형상이 성능과 내부유동에 미치는 영향

  • 최영도 (한국해양대학교 산학협력단) ;
  • 임재익 (한국해양대학교 대학원) ;
  • 김유택 (한국해양대학교 기관시스템공학부) ;
  • 이영호 (한국해양대학교 기계.정보공학부)
  • Published : 2008.08.01
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Abstract

The purpose of this study is to examine the effect of nozzle shape on the performance and internal flow of a cross-flow hydro turbine. CFD analysis for three kinds of nozzle shape is conducted to simulate the effect of nozzle shape. The results reveal that relatively narrow nozzle width is effective to increase the turbine efficiency and output power. Almost output power is achieved at Stage 1. Therefore, optimum design of the nozzle shape is necessary to improve the turbine performance. Recirculation flow in the runner passage decreases the turbine efficiency and output power because the flow make hydraulic loss and collision loss in the region. Air should be put into the runner passage and the recirculating flow should be suppressed by the air layer in the runner.

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References

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