Improvement of Performance of Undershot Cross-Flow Water Turbines Based on Shock Loss Reduction

Yasuyuki Nishi; Kentaro Hatano; Takashi Okazaki; Yuichiro Yahagi; Terumi Inagaki

doi:10.5293/IJFMS.2020.13.1.030

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저자정보: Yasuyuki Nishi (Ibaraki University) Kentaro Hatano (Ibaraki University) Takashi Okazaki (Ibaraki University) Yuichiro Yahagi (Ibaraki University) Terumi Inagaki (Ibaraki University)

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.13 No.1

발행연도: 2020.3

수록면: 30 - 41 (12page)

DOI: 10.5293/IJFMS.2020.13.1.030

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Undershot cross-flow turbines are applicable to shallow open channel flows and are characterized by a simple structure free of guide vanes or a casing. Since these water turbines operate in a free surface flow field, the optimum inlet blade angle and outlet blade angle are considered to vary with the flow rate in the open channel; however, guidelines for setting these angles are yet to be established. In this study, a method to improve the performance of an undershot cross-flow water turbine based on shock loss reduction was proposed. First, by varying the blade angle of the straight blades of the turbine, the inlet blade angle and outlet blade angle which reduced shock loss in the first-stage inlet region and second-stage inlet region were investigated through free surface flow analysis. From the results, it was shown that by taking the inlet and outlet blade angles which minimize the first-stage and second-stage shock losses for straight blades and applying them to curved blades, shock loss is reduced, thereby improving turbine efficiency and turbine output.

#Water Turbine #Cross-Flow Turbine #Open Channel #Free Surface #Performance #Shock Loss

참고문헌 (17)

참고문헌 신청

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