压力决定的给水管网需水量计算方法

Pressure driven water demand calculation in water supply network

现有的一些给水管网水力计算是基于用水量不随水压变化而变化为前提条件进行的,但是当管网水压不足时,实际的节点供水量小于原需水量要求.这种情况下水力计算应该反映出水压不足时的实际用水量受节点水压的影响.根据对二者关系的不同模拟方法,产生出多种不同的计算方法.本文就这一问题的主要计算方法作了一个总结和回顾,并分为显函数法和虚拟水池法两大类,同时对各种方法的特点做了评述,并对不同方法造成的计算结果的差异、收敛性和计算效率做了分析.最后指出,实测数据是提高模型精度的根本,算法的收敛性和效率还值得进一步研究.

Some of the current water supply network hydraulic calculation is based on the precondition that water demand is not related to water pressure changes.If water pressure is insufficient in water suplly network,the available node water demand is less than the required demand.The hydraulic calculation under such a circumstance should reflect the actual relationship between water demand and water pressure.There are a variety of methods of such a pressure driven demand calculation,which are categorized into explicit function approach and virtual tank approach.A review of the main calculation methods and their characteristics are presented.The different results caused by the different methods,the convergence and computational efficiency are analyzed as well.Finally,it is pointed out that the on-site data is the key to improve the accuracy of the model.The algorithm convergence and its efficiency is worthy of further study.