考虑漏失和用户用水的供水管网PDD模型构建及应用

管网的微观水力模型通常将所有水量依据管段的长度分配到各个节点.通过研究这种供水管网传统水力模型,针对该模型忽略节点流量类别直接将总漏失量平均分配到管网中的问题,将传统水力模型中的节点流量分为用户用水量和漏失水量,并运用改进的一致漏损模型将管段的漏失量按管段长度分配,构建漏失水量与压力之间的关系式,建立压力驱动节点的水力模型(PDD).模型形成后,根据实际测压点数据对模型进行校核,以达到模型校核标准.将该模型应用于Y市实际管网,根据Y市实际管网数据得到的平均漏失率,建立计算供水量与实际供水量的适应度函数,计算供水管网模型中的漏失系数,最终实现基于压力驱动节点流量的供水管网漏失模拟.结果表明,校核后的PDD模型与实际供水管网运行压力情况吻合良好,可以进行管网漏失控制研究及评估.

Construction and application of PDD model considering leakage and water-users in water supply network

The whole water is assigned to each node according to the pipes'' length in micro-dynamic hydraulic model of water supply network. Traditional hydraulic model of water supply network ignored the category of nodes flow and distributed the total leakage to the network equally. To solve this problem, nodes flow of traditional hydraulic model were divided into water users'' consumption and water leakage, and the improved consistent leakage model distributed the leakage flow based on length and built the relationship between the leakage and pressure, then the pressure-driven nodes hydraulic mode (PDD) was finally established. The model was checked based on actual measuring point data, and reached the model checking standard. Based on the actual network data in Y city, the average leakage rate is calculated as well as the fitness function between water supply and actual water supply, then the leakage coefficient of the network model is achieved, and finally the leakage simulation based on pressure-driven nodes flow of the water supply is established. The results show that, the checked PDD model is in good agreement with the actual operation pressure of water supply network so that it can detect and evaluate the leakage control.