含沙水流对平面钢闸门底缘的冲蚀影响研究

Study on the erosion effect of sandy flow on the bottom edge of plane steel gate

为研究含沙水流对平面钢闸门底缘的冲蚀磨损作用,基于有限体积法建立三维流场模型,采用FLUENT软件进行数值模拟。以最大冲蚀率为分析指标,通过控制变量法讨论单因素下水流速率、沙粒直径和含沙量对闸门动水开启过程中的冲蚀影响。结果表明:含沙水流对平面钢闸门面板底缘的冲蚀作用随闸门高度的增大而逐渐减小,应避免门体长期处于低开度状态;闸门提升的不同阶段,其最大冲蚀率的降幅是一定的,开启初期降幅最大,随着开度增大而逐渐减小;水流速度和含沙量与闸门底缘的冲蚀率呈正相关,是影响面板发生冲蚀破坏的主要因素,而粒径的增大会使冲蚀率呈现减小的趋势。

In order to study the erosion effect of sandy flow on the bottom edge of plane steel gate,a three-dimensional flow field model was established based on the finite volume method.Fluent was used for numerical simulation.Taking the maximum erosion rate as the analysis index,the influence of water flow rate,sand particle diameter and sand content on the erosion during the dynamic water opening process of the gate was discussed by the control variable method under the single factor.The results show that the erosion effect of sediment laden flow on the bottom edge of plane steel gate panel decreases gradually with the increase of gate height.The gate body should be avoided from being in the state of low opening for a long time.At different stages of gate lifting,the decline of the maximum erosion rate is certain.The decline is the largest at the initial stage of opening,which decreases gradually with the larger opening.The flow velocity and sediment concentration are positively correlated with the erosion rate at the bottom edge of the gate,which is the main factor affecting the erosion failure of the panel.The increase of particle size will reduce the erosion rate.