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根据天然气管网的系统特征，阐述了天然气管网中的基本关系式和在天然气管网仿真中的应用方法；讨论了天然气管网静态仿真节点压力法和动态仿真特征线法的原理和仿真系统模型的建立方法。根据这些方法和长期的科研实践，研制了天然气管网静动态仿真软件ＧＡＳ－ＦＬＯＷ。该对管网结构不作，达用于由管道，调压阀，压缩机，气田及众多气源和用户组成的任意环状和枝状管网，实现天然气集，输，配管网的静动态仿真。还介绍了ＧＡＳＦＬ

^STATIC AND DYNAMIC EMULATION OF NATURAL GAS PIPELINE NETWORK

??n the light of system characteristics of natural gcs pipeline network,the basic relational expressions and applied methods of the pipeline network emulation are expounded.The static emulation node pressure method of the pipeline network,the principle of dynamic emulation characteristic method and the method of setting up emulation system model are discussed.The static and dynamic emulation software-GASFLOW of the pipeline network is developed.The software is without any restriction on pipeline network structure and is suitable to various cyclic and dendritic pipeline network consisting of pipeline,pressure-regulating valve,compressor,gas field,numerous gas sources and users,which realizes the static and dynamic emulation of gathering,transporting and distributiong pipeline networks.The design method,structure,function and service characteristics of GASFLOW are described,A practice example is given out by emulating the natural gas pipeline network of USA User Energy Corporation in Michigan area.