反弧段后掺气坎底空腔长度的计算

Calculation of bottom cavity length behind concave reach

采用引入VOF方法的k-ε双方程紊流数值模拟和量纲分析的方法,对高水头泄洪建筑物反弧段后掺气坎底部空腔长度计算进行了研究,考虑反弧段附加离心力对空腔长度的影响,推导出高水头泄水建筑物反弧段后底空腔长度计算公式。该公式能够充分反映低弗氏数情况下,反弧段末端的掺气坎几何形态、来流条件及掺气坎后空腔长度的变化关系。

We introduced numerical simulation and dimensional analysis methods on the basis of previous research results and calculated the bottom cavity length behind concave reach of high-head discharge structures.Considering the impact of additional centrifugal force on bottom cavity length,we derive the formula of calculating bottom cavity length behind concave reach,which reflect the relationship among bottom cavity length,geometry of aerator and inflow condition under low Fr number.