Performance characteristic investigation and stay vane effect on Ns100 inline francis turbine Singh, Patrick Mark; Chen, Zhenmu; Hwang, Yeong-Cheol; Kang, Min-Gu; Choi, Young-Do;
This study presents the performance characteristics of a small Francis turbine with an inline casing and is a continuation of a previous study. A new runner design has been implemented using the previous facility. The specific speed of the new runner has been modified from 80 to . This turbine can be installed in a city water supply system. To dissipate excess pressures in the water line system an inline-turbine can be used instead of an inline-pressure reducing valve. Thus, some of the energy can be recovered by utilizing the pressure difference. For best applicability and minimal space consumption, the turbine is designed with an inline casing instead of a common spiral casing. As a characteristic of inline casing, the flow accesses to the runner are in the radial direction, showing low efficiency. The installation of vanes improves the internal flow and positively affects the output power. In contrast to the previous study, the new runner reduces the effect of the stay vanes by maintaining a higher efficiency.
Francis turbine;Inline casing;Stay and guide vanes;Performance;Internal flow;
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