多层建筑物排水（污）系统非恒定流数学模型

A Mathematical Model of Unsteady Flow in the Multistory Drainage Network

建筑物污水排放系统中的水流为非恒定流，研究其系统中的非恒定流波的传播现象不但对预估管道中的各种水流现象，进行最优设计有着紧密的联系，同时对进一步研究管道中固体物的运动机理及水气两相流问题也有着重要的意义。本文通过应用特征差分方法，数值求解圣维南方程组，对管道中非恒定流进行了分析并建立了相应的计算机程序；对建筑物排污系统常见的边界情况进行了研究，并建立了无量纲的经验公式，这些公式作为边界条件与计算机程序相结合。

Flow in a building drainage network may be defined as unsteady, partially filled pipe flow, due to the wave attenuation where the inflow is intermittent and time dependent. The effect of the wave attenuation makes it impossible to predict accurately flow throughout the system, such as wave action or local flow depth variations and back flow effects in thevvicinity of pipe junctions, without recourse to a time-dependent solution of unsteady flow equations. A numerical method based on the characteristies- difference scheme with time-line interpolation was developed for predicting free surface unsteady flow in the multistory drainage network. Boundary conditions for out flow and junction were developed both experimentally and numerically, and were applied to the actual drainage systems. Applications to building drainage networds are demonstrated and full scale validation tests presented.