Evaluation criteria for velocity distributions in front of bulb hydro turbines

RENEWABLE ENERGY

卷:121

Article

Gabl, Roman^1,2,3  Innerhofer, Daniel¹  Achleitner, Stefan¹  Aufleger, Markus^1,3 

[1] Univ Innsbruck, Unit Hydraul Engn, Tech Str 13, A-6020 Innsbruck, Austria

[2] Univ Edinburgh, Sch Engn, Inst Energy Syst, Edinburgh, Midlothian, Scotland

[3] Free Univ Bozen, Fac Sci & Technol, Hydraul & Maritime Construct & Hydrol, Bolzano, Italy

关键词: Kaplan;    Hydro power;    Design process;    Velocity distribution;    3D numerical simulation;    ANSYS-CFX;   

DOI  :  10.1016/j.renene.2018.01.027

来源: Elsevier

【 摘 要 】

General guidelines are available for the design of intake structures in river power plants. Nearly all existing criteria are limited in scope to a (rectangular) control section near the trash rack. In this section, a homogeneous flow with negligible wall influence is defined as the ideal condition. 3D numerics can simulate the complete velocity field up to the turbine, and therefore inform investigations of different inflow structure variations. This paper presents a review of six existing criteria and a modification of the Fisher-Franke criterion. All criteria are tested for both theoretical pipe flow conditions and artificial biased velocity distributions, for which different simplified obstacles in front of a turbine are investigated with the help of the 3D numerical software ANSYS-CFX. The best results could be achieved using the evaluation of the kinetic energy flux coefficient as well as the new modified criterion. Both can be recommended for the geometry optimisation of the intake structure. (C) 2018 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free