保水堰的交替水流数值模拟初探

为了对保水堰的交替水流进行数值模拟,依据保水堰恒定流情况下的工作特性,将保水堰的水流形态分成堰流和满流两种状态,分别建立保水堰不同流态下的非恒定流数学模型。分析两种不同水流形态的交替机理,建立两种水流的转换条件,联立两种不同形态的数学模型构成保水堰的堰流和满流交替的非恒定流数学模型。利用数值计算的方法对保水堰的水流交替情况进行了模拟,结果表明,通过将两种流态的方程进行组合,可以合理地模拟保水堰的水流交替过程。

Numerical simulation of alternate flow in overflow weirs

According to the hydraulic property of overflow weirs under steady flow,the flow patterns of overflow weirs were classified into free overfall and submerged overfall,and numerical models for unsteady flow were established to simulate the two flow patterns respectively.Based on an analysis of the mechanism of flow pattern alternation,approximate criterion for flow pattern alternation was formulated,and a numerical model was worked out for simulation of free overfall and submerged overfall alternation by combination of the above two models.The simulation of the flow pattern alternation in overflow weirs shows that the method is reasonable and effective.