Study on Hydraulic Jump Characteristics of Airfoil-shaped Measuring Flume in U-shaped Channel

Airfoil-shaped measuring flume is one new type of equipment applicable for end-canal in plain irrigation district,for which the parameters of hydraulic jump is the important criteria to determine the reasonable selection.In order to further study on the issue,two typical contraction ratios for U-shaped end-canal,namely 0.45 and 0.49,are selected to conduct 3D simulation for the hydraulic jump characteristics of airfoil-shaped measuring flume based on Flow-3D software,which use Tru-VOF method to track the free surface and Favor technology to optimize mesh.And the parameters of the hydraulic jump behind airfoil-shaped measuring flume,such as time-average flow field,velocity distribution,conjugate depth,hydraulic jump length,are obtained and verified through hydraulic model test.The comparison results show that the accordance degree is high and the turbulent flow model established in this paper is correct.The study results also provide some technical references and suggestion for the research on the problem about hydraulic jump and application of airfoil-shaped measuring flume in U-shaped canal in plain irrigation district.