Numerical Study on Structural Optimization of Setting an Embedded Curved Plate at Inlet Tongue of Plunging-type Dropshaft
The plunging-type dropshaft is one of the drainage infrastructure with simple structure and wide application in the drainage system.However,the water-gas two-phase action at the water tongue of the structure is intense and the flow pattern is complex,and there is often the maximum negative pressure in the dropshaft,which is easy to cause a large number of inspirations from the outside to the downstream pipe odor escape,blowout or pipe explosion and other prob-lems.Therefore,this paper proposes a structural optimization method of setting an embedded circular arc plate at the wa-ter tongue of the dropshaft,which can effectively improve the flow pattern of the flowing water tongue into the drop-shaft,reduce the pressure value and gradient change in the dropshaft,and slow down the suction degree of the dropshaft from the outside.The 3D numerical simulation method of Fluent is used to compare and analyze the characteristics of flow pattern,pressure gradient,velocity and water and air distribution before and after structure optimization.The re-sults show that the optimized dropshaft model changes the liquid flow pattern at the inlet of the water tongue.Mean-while,the water incident angle,the water impact point and the negative pressure value at the water tongue decrease obvi-ously.The overall pressure of gradient variation amplitude in the vertical pipe of the dropshaft weakens,and the gas vol-ume which sucks from the outside of the dropshaft also reduces greatly.The new optimization method of shaft structure designed in this paper has a better effect on the problem of falling shaft into the flow tongue,and also provides a certain reference for the design and optimization of dropshaft.
NETL
NSTL
万方数据
维普
