天然气管网稳态和瞬态仿真的边界条件

确定边界条件是仿真的关键环节，分别建立了稳态、瞬态仿真的数学模型并采用了合适的求解方法，开发了相应的计算软件。在对比分析两类仿真问题边界条件提法异同的基础上，重点讨论了所有节点都给定流量边界条件的瞬态仿真问题，在软件的编制过程中增加了一些商业软件没有考虑的瞬态仿真中所有节点都给定流量边界条件工况的计算，使得仿真软件的功能更加完善，便于其在工程实际中应用。研究发现，所有节点均给定流量边界条件的瞬态仿真问题是可以求解的，并有一定工程实际应用价值。当气源控制参数为气体的供气量时，必须事先较好地预测各节点用气量的变化趋势，提前制定进气计划，以避免造成供气不足或者管网局部超压的事故。

BOUNDARY CONDITIONS OF STEADY AND TRANSIENT SIMULATION OF GAS PIPELINE NETWORK

To identify the boundary conditions is a key step for simulation. The mathematical model of steady and transient simulation of natural gas pipeline network has been established and appropriate algorithm has been adopted to develop corresponding simulation software. Based on the researches of boundary conditions of steady and transient simulation, this paper focused on the discussion about the transient simulation in which every node was given the flow rate as boundary conditions. The software developed in this paper has included the above boundary conditions that some business software do not have in transient simulation, making the simulation software more comprehensive and more convenient in engineering application. The study results show that the abovementioned transient simulation problems are resolvable and it has certain practical project application values. When the control parameter of gas source is gas supply quantum, the changing trend of each node's gas consumption must be well predicted and the gas volume should be planned in advance to avoid inadequate gas supply or partial overpressure in the pipeline network.