城市供水管网瞬态水力模型的建立和应用

以上海市北自来水公司供水管网为例,阐述了在"稳态模型"的基础上自动建立"瞬态模型"的系统方法:首先,根据管网情况对瞬变流需求分析进行权值计算;其次,根据统计模型确定计算范围并对管网进行自动标志;然后确定边界条件和其他系统参数,并用特征线法对"瞬态模型"进行计算;最后根据现场实测数据对模型进行校验.与传统方法相比较,该方法在建立供水管网动态水力模型的过程中将"稳态模型"和"瞬态模型"有机地结合起来,拓展了其应用的范围,能有效地帮助管理者预防管网事故的发生.

Construction and application of transient hydraulic model of urban water supply distribution network

This paper presented a new method to construct transient model on basis of steady model: First, it calculated the weight value of transient flow to decide the requirement of transient analysis; second, it used the statistic model to confirm the calculation bound and signed the distribution network; third, when boundary conditions and other system parameters had been confirmed, the equations of transient could be solved using the method of characteristics (MOC); at last, it verified the model based on test data. Contrast to traditional method, this method integrates transient model with steady model seamlessly in the process of constructing the dynamic hydraulic model of water supply distribution network, which extends the application aspect, and can be used to safety analysis of distribution network to guard against accident, such as pipe burst.