伪均质固液两相流水击的数值模拟:Ⅰ──理论

NUMERICAL SIMULATION OF WATER HAMMER IN PSEUDI-HOMOGENEOUS SOLID-LIQUID TWO-PHASE FLOWS I. Theory

发生在固体物料管道输送中的水击，理论上分为伪均质固液两相流水击和非均质固液两相流水击两类。本文推导了伪均质固液两相流水击的基本方程，并用特征线差分方法对它们进行求解，建立了伪均质固液两相流水击的数学模型。本模型的压力波波速表达式和阻力的处理方法都体现了伪均质固液两相流的特点。

Water hammer happened in pipelines transporting solid materials is classified into two types in theory, i. e. pseudo-homogeneous solid-liquid flow and heterogeneous solid liquid flow. After computing equations are deduced and characteristic method is used to solve the equations, a mathematical model for pseudo-homogeneous solid-liquid two phase flows has been developed in this paper. In this model, the characteristics of pseudo-homogeneous solid-liquid two-phase flows have been considered in the expression of wave propagation speed and also during treating with flow resistance.