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Optimization of Blade Geometry of Savonius hydrokinetic turbine Based onGenetic Algorithm

Energy Engineering 2023年第12期120卷 2819-2837页

作者： Jiahao Lu Fangfang Zhang Weilong Guang Yanzhao Wu Ran Tao Xiaoqin Li Ruofu Xiao College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China

Savonius hydrokinetic turbine is a kind of turbine set which is suitable for low-velocity *** conventional turbines,Savonius turbines employ S-shaped blades and have simple internal ***,there is a large space for optimizing the blade *** this study,computational fluid dynamics(CFD)numerical simulation and genetic algorithm(GA)were used for the optimal *** optimization strategies and methods were determined by comparing the results calculated by CFD with the experimental *** weighted objective function was constructed with the maximum power coefficient Cp and the high-power coefficient range R under multiple working *** helps to find the optimal individual of the objective *** the optimal scheme with the initial scheme,the overlap ratioβincreased from 0.2 to 0.202,and the clearance ratioεincreased from 0 to 0.179,the blade circumferential angleγincreased from 0°to 27°,the blade shape extended more towards the *** overall power of Savonius turbines was maintained at a high level over 22%,R also increased from 0.73 to *** comparison with the initial scheme,the energy loss of the optimal scheme at high blade tip speed is greatly reduced,and this reduction is closely related to the optimization of blade *** R becomes larger,Savonius turbines can adapt to the overall working conditions and meet the needs of its work in low flow rate *** results of this paper can be used as a reference for the hydrodynamic optimization of Savonius turbine runners.

关键词： hydrokinetic turbine savonius runner multiple target optimization genetic algorithm performance improvement

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Impact of the blockage ratio on the transport of sediment in the presence of a hydrokinetic turbine: Numerical modeling of the interaction sediment and turbine

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International Journal of Sediment Research 2021年第6期36卷 696-710页

作者： Fatima Khaled Sylvain Guillou Yann Méar Ferhat Hadri University of Caen Normandy LISV University of Versailles Conservatoire National des Arts et Métiers University of Caen Normandy

Interactions between hydrokinetic turbines and near scale and far scale bed sediment particles are considered a critical area of assessment; however, a limited number of research studies have been published to address this issue. The current paper explores the influence of the blockage ratio on the morphology evolution downstream from a hydrokinetic turbine. A modeling framework is derived to predict the significant transport induced by a turbine installed on the erodible fluvial sandy bed surface,such as the Eulerian multi-phase model for the sediment and the Blade Element Momentum Theory(BEMT) for the turbine, using the open source platform OpenFOAM. Two configurations of different blockage ratios are considered. The configurations show differences in the bed morphology and the sediment transport. It has been shown for both configurations that the scour capabilities are enhanced below the turbine due to the acceleration of the flow and increasing local shear stress on the sediment.

关键词： Environmental impact Blockage effects Euler-Euler multiphase hydrokinetic turbine Numerical simulations OpenFOAM

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