阶梯形丁坝下游回流规律分析
发布时间：2018-07-24 21:31
【摘要】：阶梯形丁坝在航道整治中应用广泛,其回流规律与船舶通航、坝田淤积及堤岸稳定等系列问题密切相关,但目前研究很少。应用三维水流数学模型研究双级阶梯形丁坝几何尺度及来流条件对回流规律的影响,结果表明:(1)回流长度随一级丁坝相对长度ε_1及高度ψ_1、二级丁坝相对长度ε_2均呈递增变化趋势,随弗劳德数Fr呈先增大后减小的变化趋势;(2)回流宽度随ε_1,ε_2和ψ_1变化相对明显,而随Fr变化总体较小;(3)回流正、负流区宽度比沿程变化曲线总体为上凸状,负流区宽度相对较大,在靠近丁坝部位可达正流区宽度的2.5倍;(4)回流曲线形态与ε_1,ε_2和ψ_1有关,ε_1和ψ_1主要影响回流曲线长度,ε_2影响回流曲线的整体形态;(5)回流流量一般小于来流量的10%,沿程分布曲线不对称,增流区回流流量变化相对缓慢,而减流区变化相对剧烈。
[Abstract]:Stepped spur dike is widely used in waterway regulation, and its backflow law is closely related to a series of problems, such as navigation of ships, siltation of dam field and stability of dike bank, etc., but there is little research at present. In this paper, the effect of geometric scale and flow conditions of two-stage stepped spur dike on the reflux law is studied by using the three-dimensional flow mathematical model. The results showed that: (1) the reflux length increased with the relative length 蔚 1 and the height 蠄 1, the relative length 蔚 2 of the secondary groin increased gradually, and then decreased with Froude number Fr; (2) the circumfluence width changed relatively obviously with 蔚 1, 蔚 2 and 蠄 Snap1. (3) the width of the negative flow zone is higher than that of the negative flow zone, and the width of the negative flow zone is relatively large, and the variation curve of the width of the negative flow region is generally convex. (4) the shape of the backflow curve is related to 蔚 _ s _ 1, 蔚 _ s _ 2 and 蠄 _ 1, 蔚 _ s _ 1 and 蠄 _ 1 mainly affect the length of the reflux curve, 蔚 _ 2 affects the whole shape of the return _ flow curve; (5) the return flow rate is generally less than that of the coming flow rate, along the length of the return curve. The range distribution curve is asymmetrical, The flow rate of reflux in the increasing area is relatively slow, while that in the reducing zone is relatively sharp.
【作者单位】： 重庆交通大学国家内河航道整治工程技术研究中心;重庆交通大学水利水运工程教育部重点实验室;重庆市信息通信咨询设计院有限公司;
【基金】：重庆市基础与前沿研究计划项目(cstc2017jcy AX0278) 国家自然科学基金资助项目(51509026)
【分类号】：U617.91
本文编号：2142714
[Abstract]:Stepped spur dike is widely used in waterway regulation, and its backflow law is closely related to a series of problems, such as navigation of ships, siltation of dam field and stability of dike bank, etc., but there is little research at present. In this paper, the effect of geometric scale and flow conditions of two-stage stepped spur dike on the reflux law is studied by using the three-dimensional flow mathematical model. The results showed that: (1) the reflux length increased with the relative length 蔚 1 and the height 蠄 1, the relative length 蔚 2 of the secondary groin increased gradually, and then decreased with Froude number Fr; (2) the circumfluence width changed relatively obviously with 蔚 1, 蔚 2 and 蠄 Snap1. (3) the width of the negative flow zone is higher than that of the negative flow zone, and the width of the negative flow zone is relatively large, and the variation curve of the width of the negative flow region is generally convex. (4) the shape of the backflow curve is related to 蔚 _ s _ 1, 蔚 _ s _ 2 and 蠄 _ 1, 蔚 _ s _ 1 and 蠄 _ 1 mainly affect the length of the reflux curve, 蔚 _ 2 affects the whole shape of the return _ flow curve; (5) the return flow rate is generally less than that of the coming flow rate, along the length of the return curve. The range distribution curve is asymmetrical, The flow rate of reflux in the increasing area is relatively slow, while that in the reducing zone is relatively sharp.
【作者单位】： 重庆交通大学国家内河航道整治工程技术研究中心;重庆交通大学水利水运工程教育部重点实验室;重庆市信息通信咨询设计院有限公司;
【基金】：重庆市基础与前沿研究计划项目(cstc2017jcy AX0278) 国家自然科学基金资助项目(51509026)
【分类号】：U617.91
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