船闸平面形态突变对泄洪影响的数值模拟

Numerical simulation of influence of planar morphological mutation of ship lock on flood discharge

岷江龙溪口航电枢纽工程中船闸与泄洪闸相邻布置,上闸首和闸室外墙结构断面不同导致船闸平面形态发生突变,泄洪时突扩区域将出现大范围回流、乱流等恶劣流态,影响枢纽泄洪。通过建立平面二维数学模型,计算闸室外墙前趾布置导墙前后的流场分布,结果显示:回流长度约为突扩宽度的2倍,按此范围布置导墙可基本消除回流,曲线形导墙能够使纵向流速等值线呈均匀递减分布,流态优化效果较好。

In the Minjiang Longxikou Navigation-power Junction project,the ship lock is adjacent to the flood discharge gate,the different outer wall structural sections of the upper lock head and lock chamber lead to planar morphological mutation of the ship lock,during flood discharge,the sudden expansion area will experience severe flow patterns such as large-scale backflow and turbulence,which will affect the junction flood discharge.By establishing a planar two-dimensional mathematical model,the flow field distribution before and after the arrangement of the guide wall at the front toe of the outer wall of lock chamber is calculated,the results show that the length of the backflow is about twice the width of the sudden expansion area,and the arrangement of the guide wall according to this range could basically eliminate the backflow,the curved guide wall could make the longitudinal flow velocity contour uniformly decreasing,thus the flow patterns optimization is better.