The Charcteristic Of Supercritical Flow In Intersection Area And The Research On Controlling Guide Technology

Flow intersection phenomenon is very common in the rivers and canals. Experts andscholars from domestic and foreign study more in this area, however, most of the researchbelongs to the category of subcritical flow, Research about supercritical intersection moreconcentrated on hole body anti-erosion. Drainage tunnels of tailings drainage systems mostlyexist longitudinal slope of the supercritical flow and multistage intersection between branchhole and main hole. What’s more, its using way is special. When one certain level of branchhole is used to discharge flow, there is no flow inflowing from the main hole upstream ofintersection area. Bend Flow-like folded flow pattern occurred in the intersection area, whichcauses a series of hydraulics problems such as water surface transverse slope seriousimbalance, flow spin in the hole, hole body congestion, poor ventilation. That endanger thesafety of the hole body structure, even the stability of the entire drainage system.For the prominent hydraulics problems of typical engineering of drainage tunnelsupercritical flow intersection, paper take the local physical model experiment, basing on thedepth analysis of the supercritical flow characteristics. Controlling guide ideas and technicalmeasures which improve the flow pattern in the intersection area are put forward. And theintersection area shape and boundary conditions are optimized. Through the shape selection ofcontrolling guide component settings in the branch hole and main hole and size design,different combinations of controlling guide components experiments are carried out.. Throughthe effect analysis to determine the best scheme, the optimal size of the controlling guidecomponents is further studied. Finally a controlling guide device of supercritical flowintersection area using in a certain scope of application is proposed.The adit tunnel control guides include diversion wedge, spoiler, plus rough pier.Diversion wedge to-offs are part of the water to the left side of the body to the hole, fill flowon the left side of the hole body; Deflector is used to split water; The added rough Pier is usedto increase the left side of the hole body depth, reduce in the transverse slope of the surface ofthe water.The main tunnel control guides include reflect board, steady flow pool, spoiler, skirtingdiversion. Trim tab is used to suppress the border wall channeling the flow Guarantee holebody clearance of more than pieces; The steady flow pool to accommodate the trim tab underthe pressure of the water, and play a role in digestion tangled; Deflector to cut-off section ofthe adit water, in order to alleviate the impact of the water hole side wall and split spin-rollflow, shorten the period of dispute fluctuations of the intersection area water distance;Diversion skirting to improve the discharge upstream of the main tunnel the downstreamintersection area because of changes in boundary conditions caused Rapids Mountain Dew, the water fluctuations adversely flow state.Through the model of drainage system test, the controlling effect of the controlling guidedevice setting in main hole and branch hole is good. The flow is basically stable, and the flowpattern effectively improves.