并联输水管道设计方法

针对长距离并联输水系统的特点，以年费用最小为目标，应用动态规划建立了优化设计数学模型。对模型求解中涉及到的并联输水管管径的选定和流量分配问题作了探讨，推导了连接管设置间距计算式。算例表明，所设计的并联输水管道，可明显节省年费用。

Design method for parallel conduits

In view of the special nature of long distance parallel conduit system, this paper took the minimum annual cost of the system as objective function and built an optimal design model by using dynamic programming. It also discussed the diameter selection and flow distribution of the parallel conduits concerned in solving the model, and derived a formula for the distance between link pipes. Case studies show that the annual cost of the system designed by this model can be cut down.