斜向进水消力井淹没射流水力特性机理分析

Mechanism of Hydraulic Characteristics of Submerged Jet in Dissipation Well with Inclined Inlet

云南地处高原山区,水文气象条件各异,地形陡峻、工程地质条件复杂,在常规消能工无法布置的情况下,消力井是一种可行的选择。对于斜向进水消力井,其水力特性未见更多研究。针对一定纵坡条件下斜向进水消力井井内淹没射流,基于井内水流紊动射流分区,对淹没射流条件下的水股作用力进行机理分析,推导得出了斜向进水条件下圆形消力井射流沿程最大流速及冲击区井壁时均作用力表达式;进而结合水力学试验进行了一定纵坡下的半经验公式参数率定。研究成果可为类似工程的设计提供参考。

Yunnan is located in the plateau mountainous area with varying hydrological meteorological condition,steep topography and complex engineering geology condition.When conventional energy dissipation work does not adapt,dissipation well is a feasible alteration.However,the hydraulic characteristic of dissipation well with inclined inlet is rarely studied.In this paper,the mechanism of water force in the presence of submerged jets in dissipation wells with inclined inlet and outlet under a certain longitudinal slope condition is examined based on turbulence jet division in the well.And furthermore the expressions of the maximum velocity of jet along the flow and the time-averaged impact force on the shaft wall in impact zone under the oblique inlet condition are deduced.The parameters of the semi-empirical formula under longitudinal slope condition are determined in association with hydraulic test.The research results offer reference for the design of similar projects.