水利学报2025，Vol.56Issue(2)：227-239,13.DOI:10.13243/j.cnki.slxb.20240506
淤积体对排沙漏斗水沙分离性能的影响机理研究
Research on influence mechanism of sand accumulation on water-sediment separation performance of vortex-settling basins
摘要
Abstract
In order to reveal the influence mechanism of sediment accumulation on the water-sediment separation performance of the Vortex-settling basins(VSB),the muddy water model tests were conducted under sediment ac-cumulation of different thicknesses.The three-dimensional flow field was measured by acoustic Doppler velocime-ter,and the shape change of air core was observed.The research results indicate that under different inflow rates,the sediment discharge water consumption rate increases with the increase in the thickness of the sediment accumu-lation body,and the sediment interception rate gradually decreases as the thickness of the sediment accumulation increases.The sediment discharge water consumption rate under different sediment thicknesses is 1.27 to 2.14 times that without sediment accumulation,and the sediment interception rate decreases by 33％to 57％.The sediment ac-cumulation body leads to changes in the flow field characteristics of the VSB.The increase in sediment accumula-tion thickness causes the air core to change from a stable penetration when there is no sediment accumulation to fre-quent oscillation and deviation from the flushing orifice.Under different water and sediment conditions,the air core diameter decreases by 5.95％to 53.07％,which increases the sediment discharge water consumption rate.The range and intensity of the free vortex in the VSB decrease as the thickness of the sediment accumulation body in-creases,and the average tangential velocity under the design flow decreases by 20％to 55％.The width of the an-nular low-velocity zone between the forced vortex and the free vortex increases by 33％to 40％compared to the sit-uation without sediment accumulation,which is not conducive to the spiral flow separation of water and sediment.The intensity of the transverse circulation weakens,which is not conducive to the transfer of sediment to the flush-ing orifice,leading to intensified sediment accumulation,thereby further reducing the swirl intensity.The radial and vertical turbulent intensities increase by 10％to 110％and 12％to 120％respectively with the increase in sedi-ment accumulation thickness,making it difficult for suspended sediment to settle,and the interception rate is sig-nificantly reduced.关键词
排沙漏斗/模型试验/淤积体/空气涡形态/流场特性Key words
vortex-settling basins/model experiments/sedimentation body/air core shape/flow field charac-teristics分类
建筑与水利引用本文复制引用
李琳,顾怀猛,谭义海..淤积体对排沙漏斗水沙分离性能的影响机理研究[J].水利学报,2025,56(2):227-239,13.基金项目
国家自然科学基金项目(52069028) （52069028）
