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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of Graduate School of Engineering, Nagasaki University > Volume 49, No. 93 >


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Title: 下掛け水車の出力に関する翼素運動量解析と水槽試験
Other Titles: Water Tunnel Test and Blade Element Momentum Analysis on Output Characteristics of an Undershot Water Turbine
Authors: 佐々木, 壮一 / 黒川, 由美 / 大宅, 雄一郎 / 館野, 真一
Authors (alternative): SASAKI, Soichi / KUROKAWA, Yumi / OYA, Yuichiro / TATENO, Shin-ichi
Issue Date: Aug-2019
Publisher: 長崎大学大学院工学研究科 / Graduate School of Engineering, Nagasaki University
Citation: 長崎大学大学院工学研究科研究報告, 49(93), pp.172-177; 2019
Abstract: We evaluated the output characteristics of the undershot water turbine in a circular type water tunnel of a state where the channel width was wide enough for the blade span and there was no influence of the bottom surface of the channel. The output characteristics of the water turbine are analyzed by the angular momentum acting on the blade element; the difference between the actual measurement value and the analysis was discussed based on the observation of the flow regime around the impeller in the water tunnel. The maximum output of the measured value of the more deeply immersed water turbine was larger than that of the shallow one. The analysis results of the output based on the angular momentum of the blade element could represent the characteristics of the measured value of the turbine in the case of the shallow water depth. From the observation of the flow regime, when the tip speed ratio was low, the flow going up the blade of a long chord generates bubbles in the front side of the impeller, and the bubble flow flows over the blade to the rear side. We could confirm by the observation that the flow entrained the air on the water surface, moreover, there were a lot of bubbles between the blade in the rear side.
Keywords: water turbine / water tunnel / blade element momentum analysis
URI: http://hdl.handle.net/10069/39419
ISSN: 18805574
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 49, No. 93

Citable URI : http://hdl.handle.net/10069/39419

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