Numerical Simulation Of Flow Characteristics For Xiaowacao Inverted Siphon

Inverted siphon is through the valleys, rivers, wetlands, road or other obstacles often uses the hydraulic building,it is the use of local atmospheric pressure of a pressure water conveyance pipeline. For large inverted siphon, which has large water flow, long tube body, its import and export allows the head value is small; scale is unprecedented and huge investment.(Large inverted siphon is characterized with water flow is large, inverted siphon straw figure long, its import and export permits the head value is smaller, scale is unprecedented and huge investment). To explore the reasonable arrangement and operation mode, reveal large inverted siphon project specific flow problem, has great engineering significance.The article from the measured data, the numerical simulation and the theoretical analysis from the aspects of large-scale water supply project of northern Xinjiang——Xiaowacao inverted siphon for research.The main research contents and conclusions are as follows:(1) Using the standard κ-ε model and combining the method of VOF under different flow rate of import and export flow field numerical simulation is carried out, the water level of upstream and downstream, velocity of the inlet of the numerical simulation results are compared with the experimental results, in good agreement. The inlet velocity fields were analyzed, and found import has intermittent erect swirl, this kind of swirl will affect the safety of surrounding buildings, which is recommended in the import settings spacer bar or floating type rafts, decreasing inlet flow velocity, effectively reduce the swirl.(2) The numerical simulation of pipe figure pressure, the pressure load of the design flow rate Q=17.5m3/s, the case of pipeline0.350MPa still satisfy the pipeline design requirements0.460MPa. And understand the law of pressure distribution under different flow tube figure:section gradually increasing pressure from top to bottom, the maximum pressure is the lowest point in the pipeline; the situation is quite consistent with simulation results obtained with the actual project.