文章基本信息

标题：CFD-based rehabilitation for the high specific speed Francis turbine
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作者：K Kubo ; T Nakashima ; R Shima 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：240
期号：2
页码：1-9
DOI：10.1088/1755-1315/240/2/022054
出版社：IOP Publishing
摘要：This paper present about the CFD based rehabilitation project for high specific speed (over 300 m-kW) Francis turbine. The area of rehabilitation was Spiral casing, Stay vane, Guide vane, Runner, and restricted Draft tube (draft elbow). The main goal of this project was to increase the turbine efficiency at all operating range with high operational stability, low noise as well as high cavitation performance. On the development phase of this project was carried out with CFD only (without Model test) to reduce the time of development. On the first step of this project, the shape of all components was optimized to reduce the hydraulic loss and to increase the cavitation performance with steady state CFD. After that, the operational stabilities (ex. Pressure fluctuation) on the partial load and over load point were verified with unsteady CFD. Finally, the field tests were carried out to confirm the performance of new turbine. It was found that the new turbine has excellent performance in efficiency, power output and operational stability (vibration and noise) compared with existing turbine.