流体界面追踪的计算方法

The Calculation Method of Fluid Interface Tracking

有压管道输水方式因具有占地面积少、输水损失小、维护费用低、使用寿命长、过流能力大等优点,但输水过程中的非恒定流态复杂,易形成明满过渡流,给管道带来危害,在有压管道充水过程中尤为突出.有压输水管道往往长达数千米,由于管道初始处于放空状态,流量持续充入后会在同一管道先后经历漫流、无压流、明满交替流和有压流四种复杂的过渡流态.模拟有压管道的充水过程,不仅可以预测波前的流达位置及时间,还可以掌握管道明满交替流水位及流量变化情况.因此,分析其水力特性的变化在工程应用上具有重要意义.

Pressure pipeline way for small covers an area of less,water loss,low maintenance cost,long service life,the advantages of large flow capacity,but the unsteady flow in the process of water complex,easy to form bright full transition flow,has a harmful effect on pipeline,the pressure pipeline is particularly prominent in the process of water filling. With pressure pipes often thousands of meters long,because of blow-down pipeline initial,flow after filling the will in the same pipe flowing through,free surface flow,Ming with alternating flow and pressure flow four complex transitional flow regime. Simulation of the pressure pipeline water filling process,not only can predict the wave front flow of location and time,can also grasp the pipe full of water level and flow changes alternately. Therefore,analysis of the change of its hydraulic characteristics is of great significance in engineering application.