关键词: 输气管道 , 快瞬变流 , 变量选取 , 特征线法

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