Experimental Study Of Submerged Delta Wing For Regulating Large Open Angle Open Channel Flow

In actual engineering,due to the limitation of the water delivery site,there are usually not enough long open channel diffusion section at the junction of the tunnel and the canal,so we have to use the diffusion section with large diffusion angle to achieve the convergence of the water flow.In order to effectively solve the problem of boundary layer separation,mainstream migration and other bad flow patterns in the open channel flow with large diffusive angle,we need to take control measures for the diffusive section flow to achieve balanced and smooth connection.This article from the "strengthening the wings,restrain the boundary layer separation of bottom water flow regulation method adopted intrusive appropriately control the diffusion section,flow with submerged triangle wing.Combined with the previous research results,determine the delta wing structures shape and design parameters and flow conditions,through a series of model tests,the lower section of the single wide spread momentum distribution uniformity as quantitative indicators to determine the suitable installation position of delta wing flow diffusion regulation,and summed up the delta wing at this location conditions.Fr correlation curve and flow intensity of subduction;on this basis,analysis and comparison of different scales of delta wing flow regulation effect and advantages and disadvantages;shortcomings in the regulation of water flow entities in the delta wing,take open port measures in the three corners of the bottom hole structure of wing,wing wing using flow weakening backflow region and improvement the flow section of the single wide distribution of momentum.The model test is carried out through the valve hole of different scale flow area design,focus on the analysis of the flow distribution holes flow on local flow improvement and adjustment of the delta wing wing after the downstream feature section single wide distribution of momentum,and reduce the impact on the flow resistance of the delta wing added,found in the three angle wing shape and scale under certain circumstances,increase the flow area of valve hole can effectively weaken the wing after the recirculation zone,improve the flow section of the single wide equilibrium,the momentum distribution at the same time,reduce the backwater effect generated by the front wing.With the delta wing with wing flow condition is improved,the flow capacity is also improved the diffusion section.Under the control of delta wing's design plan,the comparison of measured data of diffused section and downstream water line shows that the diffusion capacity of the design area with the largest flow area of the distributor is relatively strong.Therefore,the effect of the triangular wing design to control the flow of the diffusion section is excellent.