水力参数对弯曲渠道T型丁坝翼的影响

摘要

In the present research, by using a numerical model, some analyses were performed on flows around a T-shape spur dike and a support structure located at its upstream under different wing to length ratios of T-shape spur dike in the order of 0.25, 0.50, 0.75 and 1.00. In order to verify numerical model, physical model data were used in presence of a single T shape spur dike. Results from numerical model are desirably in agreement with those of physical one because the regression between both data is 0.86 up to 0.92. In this research, all hydraulic parameters of flows, streamlines and dimensions of flow separation zones were studied in order to select the most practical model. Increased W/L results in 7%-12% increase in the length of flow separation zone and in 2% increase in the width of this zone compared to W/L=0.25.%本文通过数值模拟,研究了T型丁坝附近的水流情况,并对翼长分别为0.25,0.50,0.75和1.00的T型丁坝上游的支护结构进行分析.为对数值模拟结果进行验证,对单个T型丁坝进行物理实验.结果表明数值模拟结果与物理实验结果吻合,其回归系数为0.86-0.92.本文研究了水流的水力参数,流线及水流分离区大小等对支护结构的影响,以选择最贴合实际的模型.增加W/L可使水流分离区的长度增加7%-12%,与W/L=0.25时相比,水流分离区的宽度增加2%.