Sprinkle Reason Analysis And Numerical Simulation Of The Pipeline Of Pump Station

High lift pumping station which run by multiple units in parallel, it would be in a long-term shutdown state when the piping system don’t transport any water, there gathered a lot of air in the tube, the formation of trapped air mass. When the unit starts to transport again, the air inside the tube constantly being compressed, and thus generate enormous pressure, promote water to spray from the pipe outlet and cause an accident.Simultaneously the pressure of piping system interior increases suddenly, which can easily lead to the burst of partial pipes, and it will cause significant hidden danger for the whole system.This paper descript the basic theory and research status of the gas-liquid two-phase flow, and use the mechanism modeling method based on the Euler-Euler multiphase flow model, take the gas-liquid two-phase flow as a continuous medium, apply the VOF model of surface tracking method under the fixed Euler mesh grid, utilize Computational Fluid Dynamics software the FLUENT6.3as a platform, ignore the dissolution between two-phase of gas and liquid in current process, to establish a mathematical model of the gas-liquid two-phase flow of Hongsipu second pumping station under the two-dimensional condition, and give the appropriate initial and boundary conditions, so it is innovative to make the gas-liquid two-phase flow theory applied in engineering examples.Through a delicate numerical simulation of gas-liquid two-phase flow within the piping system, the paper analyze the changes in its internal flow field and the pressure distribution, to grasp the true flow pattern and its change process of gas-liquid two-phase flow in the tube, and find the main reasons according to the sprinkler phenomenon of the export Pipeline when the pump station starting up again without any water, in the last part it bring that utilize the inverter control pump unit disposed in the pump room before the host group starting for a certain amount of water replenishing to the pressure pipe to solve the technical problems, which provides a theoretical basis for the design of piping systems and protection.In connection with the analysis of long-distance gas-liquid two-phase transient flow of pressurized hydraulic pipeline system numerical simulation, the results show that there exist bubbly flow, plug flow, stratified flow, wavy flow and bomb flow; liquid volume fraction in the pipe has experienced three period including linear growth, irregular growth till to no longer growth; energy loss caused by the gas-liquid two-phase flow is greater than single-phase flow. The outlet sprinkler accident of the pipe occurred fundamental because of the complex gas-liquid two-phase flow which generated tremendous energy; Make the parallel pipeline reasonable in tube design, regulate and control the capacity of water flow in the pipe can effectively avoid the occurrence of such incidents.