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Evaluation criteria for velocity distributions in front of bulb hydro turbines

机译:球形水轮机前部速度分布的评估标准

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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.
机译:一般指导原则可用于设计内河发电厂的进水口结构。几乎所有现有标准的范围都限于垃圾架附近的(矩形)控制部分。在本节中,将具有可忽略的壁影响的均匀流动定义为理想条件。 3D数值可以模拟直到涡轮的整个速度场,因此可以为不同流入结构变化的调查提供参考。本文介绍了六个现有标准的回顾和对Fisher-Franke标准的修改。对所有标准进行了理论管流量条件和人工偏差速度分布测试,借助3D数值软件ANSYS-CFX对涡轮前方的不同简化障碍物进行了研究。使用动能通量系数的评估以及新的修改标准可以实现最佳结果。两者均可推荐用于进气结构的几何优化。 (C)2018作者。由Elsevier Ltd.发布

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