Numerical simulation study on shape optimization of stilling basin with drop sill
In this paper,based on a high head and large unit-width discharge hydropower station,a series of numerical simulations on stilling basin with drop sill were conducted to reduce the stilling basin bottom hydraulics indexes.Based on the original body design,export reverse slope gradient,pool length,import fell ridge slope and height were sequentially changed,the impact of changes in various factors on stilling pool hydraulic characteristics was obtained by numerical simulation,and ultimately the optimal size of stilling basin was determined.The main results and conclusions were as follows:the export slope of stilling basin should not vertical;with stilling pool length shortening,pressure were slightly reduced at impact zone,and the velocity near the bottom changed little at first and increased significantly when stilling pool length was shortened to a certain length;when the drop sill slope decreased,the forward velocity became smaller at impact zone,but the reverse velocity became greater;lowering the first half of the stilling basin elevation could reduce the velocity at the import,but the velocity of the reverse slope section increased significantly.It is recommended not to deepen the work.When the bottom elevation was increased,the pressure decreased and the velocity changed little,so taking the amount of excavation into account,it is recommended not to lower the floor elevation.The results can provide reference and basis for similar projects design.The research results can provide reference and basis for similar engineering design.
hydraulic and hydropower projectstilling basin with drop sillshape optimizationhydraulic characteristicsnumerical simulation
国家科技期刊平台
NSTL
万方数据
维普
