压力流屋面雨水排水管系水力模型研究

根据压力流屋面雨水排水管系的水流特点及其水头损失的计算公式,确定了采用有限元法分析其水力平衡计算的数学模型,将各个计算管段的单元矩阵方程集合为雨水排水管系的整体矩阵方程,引入节点水压边界条件并求解管系整体矩阵方程对称正定线性方程组,从而得出各项水力要素,给出了计算程序框图,并编写了通用电算程序.经实例计算表明,此模型能够快捷准确地进行压力流屋面雨水排水管系的水力平衡计算.

Investigation of hydraulic model of pressure pipeline system for roof rainwater drainage

According to the flow feature of Pressure pipeline system for roof rainwater drainage and the (evaluation) formula of hydraulic loss in this system,a mathematical model for hydraulic balance evaluation is developed by using FEM analysis.The unit matrix equations of several computational pipe-segments are grouped to become a set of matrix equations for the rainwater drainage pipeline system.All hydraulic factors are obtained by introducing the boundary conditions of water pressure and solving foregoing system matrix equations,which are symmetric positive linear matrix equations.The black diagram of computer program is given and the programming is made,also.It is shown by an engineering illustration that,by using the method presented,the hydraulic balance evaluation of pressure pipeline system for roof rainwater drainage can be performed quickly and accurately.