天然气管道泄漏过程的参数变化研究

城市天然气管道泄漏是个复杂的非稳态过程,整个泄漏过程中气体流动状态随时间发生变化,利用计算机计算泄漏质量流量、泄漏速度等参数的变化。把泄漏过程分成多个时间段进行计算,单个时间段的计算是稳态泄漏,再结合理想气体状态方程、绝热方程、伯努利方程和质量守恒定律进行计算,然后把计算数据进行拟合得出泄漏质量流量、管道内压力、泄漏气体质量以及泄漏速度随时间的变化规律,为提高泄漏扩散模拟评价结果的准确性提供保证。

Research on Parameter Variations of Leakage Process of Natural Gas Pipeline

The city gas pipeline leakage is a complex non-steady-state process;flow state in the whole process of the gas leak changes over time, the computer can be used to the mass flow, leak rate and other parameters. In this paper, the leakage process was divided into multiple time periods, flow state in every single time period was considered as steady-state leakage to calculate;combined with the ideal gas equation of state, adiabatic equation, Bernoulli＇s equation and mass conservation law, the calculation was carried out, and then the calculated data were fitted to obtain leakage mass flow rate, pressure in the pipes, leaking gas quality, and change of leak rate with time.