Effect Of Y - Flaring Pier Body Of Stepped Spillway Stilling Basin + Joint Energy Dissipation Way Hydraulic Characteristics

With the continuous development of turbulence theory and computer technology, more and more widespread application of numerical simulation in hydraulic engineering, the huge role that play becomes increasingly apparent, which will be an important means for hydraulic research. Based on a hydropower station, this paper conduct numerical simulation for Y-flaring gate pier which choose different body parameters, comparative analysis of the characteristics of flow pattern, water surface profile、pressure、velocity distribution and other hydraulic characteristics, then provide the preferred solution. From the simulation results of preferred solution, water overflow sidewall exist in the side hole (1#、5#). To resolve this issue, change the shrink ratio of side hole ((1#、5#) on the basis of this program, rerun hydraulic experiment, analyze the laws of flow pattern、water surface profile、pressure、velocity distribution and other hydraulic characteristics, And numerically simulate each program, compare experimental results and calculated results, which in good agreement with the flaring pier body with final recommendations. Based on the results of previous studies, combined with the model test data, numerically simulate the three-dimensional flow field of flaring gate pier, stepped spillways and stilling basin integrated set of drag, some of the problems discussed.The design has a certain reference significance. The main research contents of this paper are:Using three-dimensional RNG k-ε turbulent flow model of air-water two-phase flow VOF method, adopting geometric reconstruction format for interpolation near water vapor surface, the velocity and pressure coupling approaching use PISO algorithm, the algorithm of the unsteady flow approximate stable solution of steady flow. The simulation range from the upstream reservoir to the downstream end of the stilling basin, make a three dimension numerical simulation to2#、3#、4#flaring pier body which have a table hole contraction ratio of0.7、0.445、0.4respectively. Mainly comparative analysis of flow pattern, water surface profile, pressure, velocity distribution and other hydraulic characteristics,which found the recommended flaring gate pier body is2#.、3#、4#with table hole contraction ratio of0.445. Seen from the simulation results of the recommended flaring gate pier1#、5#table hole exist water overflow sidewall phenomenon. To resolve this issue, change the contraction ratio of side hole (1#、5#) on the basis of this program, which were0.445、0.497、0.598respectively, and conduce hydraulic experiment, analyze the laws of flow pattern, water surface profile, pressure, velocity distribution and other hydraulic characteristics.By means of numerical simulation, analog computation have been done for the flaring gate pier body with side orifice contraction ratio of0.445、0.497、0.598. Compare experimental results and calculated results, which in good agreement. Combine test study with numerical simulation, which have different levels of water overflow sidewall phenomenon with contraction ratio of0.445、0.497; While the contraction ratio of0.598, there is no water overflow sidewall phenomenon. Therefore, adopting flaring gate pier body with contraction ratio of0.598.