一、环状管网经济管径的计算一个环状管网,通常各管段的长度、各节点流量以及全网路的最大压降均是已知的。在这种情况下,管网计算的任务,就在于求出各管段的压降、流量及其流向,以及各管段的管径。以往对这种网路的计算,都是根据进出节点的流量相平衡的原则,预先给出各管段的流量及流向,然后把全网路的 First, the calculation of the economic diameter of the ring pipe network A ring pipe network, usually the length of each pipe segment, the flow of each node and the maximum pressure drop across the entire network are known. In this case, the task of pipe network calculation is to find the pressure drop, flow rate and flow direction of each pipe segment, and the pipe diameter of each pipe segment. In the past, the computation of this kind of network was based on the principle of balancing the flow of traffic from and to the nodes. The flow and flow of each segment were given in advance, and then the entire network was