Ⅱ型和H型立柱对排沙漏斗水沙分离性能的影响  

Influence of II and H-type stand columns on flow and sediment separation performance in a vortex settling basin

作　　者：李琳[1] 穆卓昀 谭义海[1] LI Lin;MU Zhuoyun;TAN Yihai(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《水利水电科技进展》2021年第5期8-14,61,共8页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(52069028);新疆维吾尔自治区高校科研计划(XJEDU2018I010);新疆维吾尔自治区研究生科研创新项目(XJ2020G171)。

摘　　要：为获取不同立柱体型对排沙漏斗水沙分离性能的影响规律,通过室内试验对不加设立柱、加设Ⅱ型和H型立柱支撑系统的排沙漏斗水沙分离性能进行研究。试验结果表明:无立柱时空气涡贯穿排沙底孔,涡径最大,清水区面积最大,漏斗室内的螺旋流强度最大;加设Ⅱ型立柱后空气涡产生偏移,涡径减小,清水区面积减小,漏斗室内的螺旋流强度减小;H型立柱下空气涡偏移距离最大,涡径最小,清水区面积最小,漏斗室内的螺旋流强度最小。相较于加设H型立柱,Ⅱ型立柱支撑系统下排沙漏斗的总截除率、泥沙排出率、漏斗室内淤积量、排沙耗水率与悬板下方不加设立柱时相近,为保证悬板安全及较高的截除率,可采用Ⅱ型立柱作为支撑体型。In order to obtain the influence law of stand column types on flow and separation performance in a vortex settling basin(VSB),VSBs without column support system,with II-type and VSB H-type stand columns were studied by model experiments respectively.The results show that in the case without columns,the air core penetrates through the flushing bottom with the largest air core diameter,the maximal clean water area and the strongest spiral flow intensity.The air core offsets the flushing bottom after the installation of II-type columns,leading to smaller air core diameter,clean water area reduction and lower spiral flow intensity.The offset distance of air core is the largest after installation of type-H columns,leading to the smallest air core diameter,minimum clean water area and weakest spiral flow intensity.Compared with H-type columns,the sediment trapping efficiency,flushing efficiency,sediment deposition in the basin,water abstraction ratio under the II-type column system are similar to those without columns under deflector.II-type columns can be used as the support body shape to ensure the safety of the deflector and a higher sediment trapping efficiency.

关 键 词：排沙漏斗 溢流悬板 模型试验 立柱体型 水沙分离 

分 类 号：TV149.2[水利工程—水力学及河流动力学]