Abstract: Based on different selection of the basic parameters, including pressure (p), enthalpy (H), density (ρ), entropy (s) and flow velocity (u), the traditional conservative model of gas transmission pipelines was transformed into 3 types: pρu, pHu and psu model. The method of characteristics was adopted to solve the above three model. The fast transient caused by instantly opening and closing valves in the gas transmission experimental pipeline was simulated with the three models respectively. The results show that the simulation process of the gas pipeline is not sensitive to the selection of the basic parameters. Comparatively, the pHu model owned a slice advantage on accuracy and computing speed over the other two models.

Key words: Gas pipeline, Fast transient, Parameter selection, Method of characteristics, Dynamic simulation

摘要： 依据输气管道快瞬变流数学模型中基础变量(压强p , 焓H , 密度ρ, 熵s 和流速u)组合形式的不同, 将传统守恒型输气管流模型划分为传统的pρu 模型、p H u 模型和psu 模型, 并采用特征线法分别对三种模型进行等价转化及迭代求解。分别采用三种模型对输气管道阀门瞬时开关的室内试验进行模拟分析与结果对比, 结果发现计算机运行情况对模拟方程中非独立变量的选择相对不敏感, 三种模型比较而言, p Hu 模型精度较高, 并且运行速度较快。

关键词: 输气管道 , 快瞬变流 , 变量选取 , 特征线法