Influence of Number of Blades on Performance and Internal Flow of High Head Contra-Rotating Small Hydroturbine

Takuji Hosotani; Toru Shigemitsu; Yuki Kawaguchi; Takuya Inamoto; Takeru Ishiguro; Ding Nan

doi:10.5293/IJFMS.2020.13.4.786

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자료유형: 학술저널

저자정보: Takuji Hosotani (Tokushima University) Toru Shigemitsu (Tokushima University) Yuki Kawaguchi (Tokushima University) Takuya Inamoto (Tokushima University) Takeru Ishiguro (Tokushima University) Ding Nan (Xi’an Jiaotong University)

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.13 No.4

발행연도: 2020.12

수록면: 786 - 795 (10page)

DOI: 10.5293/IJFMS.2020.13.4.786

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It is requested that the hydroturbine be a small size and have high performance. Therefore, we adopted contrarotating rotors, which can be expected to achieve radial compactification and high performance. However, a conventional contra-rotating rotor was composed of two axial flow rotors, so it had a specification suitable for high flow rate and low head. In order to achieve a small hydroturbine suitable for low flow rate and high head, we propose new type of contra-rotating rotors, which are composed of a hybrid rotor and a centrifugal rotor. In the present paper, we focus on the number of blades of the hydroturbine composed of these rotors as a first step of this research, and investigate performance by numerical analysis. As a result, it clarifies that the head of the front rotor is lowered due to the slip of the flow, and it has been confirmed that increasing the number of blades can suppress the slip of flow and improve the turbine head and the shaft power. Also, it clarifies that the shaft power of the rear rotor was almost unchanged even if the number of blades is changed, and that the meridional plane shape has a greater effect on the performance than the number of blades.

#Small hydroturbine #Contra-rotating rotor #Number of blades #Performance #Internal flow

참고문헌 (13)

참고문헌 신청

A. Furukawa / 1998 / Basic Study of Low Head Water Power Utilization by Using Darrieus-type Turbine / Trans. JSME 64(624):2534~2540

T. Kanemoto / 2004 / Development of Gyro-type Hydraulic Turbine Suitable for Shallow Stream (1st Report, Rotor Works and Hydroelectric Power Generation) / Trans. JSME 70(690):413~418

J. Matsui / 2010 / Internal Flow and Performance of the Spiral Water Turbine / Turbomachinery 38(6):358~364

T. Ikeda / 2010 / Performance of nano-hydraulic turbine utilizing waterfalls / Renewable Energy 35:293~300

M. Nakajima / 2008 / Performance of Savonius Rotor for Environmentally Friendly Hydraulic Turbine / Journal of Fluid Science and Technology 3(3):429

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