A study of the flow field of an axial flow hydraulic turbine with a collection device in an open channel

RENEWABLE ENERGY

卷:130

Article

Nishi, Yasuyuki¹  Sato, Genki²  Shiohara, Daishi²  Inagaki, Terumi¹  Kikuchi, Norio³ 

[1] Ibaraki Univ, Dept Mech Engn, 4-12-1 Nakanarusawa Cho, Hitachi, Ibaraki 3168511, Japan

[2] Ibaraki Univ, Grad Sch Sci & Engn, 4-12-1 Nakanarusawa Cho, Hitachi, Ibaraki 3168511, Japan

[3] Ibasei Ltd, 4-7-10 Kamine Cho, Hitachi, Ibaraki 3170064, Japan

关键词: Small hydro power;    Hydraulic turbine;    Collection device;    Flow field;    Free surface;    Slipstream;   

DOI  :  10.1016/j.renene.2018.06.114

来源: Elsevier

【 摘 要 】

Axial flow hydraulic turbine with a collection device aims to improve the output using an open channel and concentrating/increasing the volume and velocity of flow. The flow field of this turbine is extremely complex because it has a free surface, and its internal and external flows are mixed. Several such hydraulic turbines are occasionally placed in series against a flow. Thus, it is of utmost importance to elucidate the flow structure downstream of the hydraulic turbine. The proposed study aims to elucidate the flow field of this hydraulic turbine in a shallow open channel by the means of PIV measurement, multiphase flow analysis considering the free surface, and single-phase flow analysis considering uniform flow as the premise. As a result, the characteristics of the flow field of the hydraulic turbine considered herein in an open channel are clarified. Especially, in terms of the slipstream characteristics, it is clarified that due to the influence of free surface and channel bottom, the type of vortexes that occur downstream of the hydraulic turbine are different, and the process and distance of velocity recovery differ depending on the vortex. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free