【摘要】 本文依据复杂管道内气体不稳定流动(瞬变流)的概括性方程,结合生产实际条件,首先提出单环管网和双环并联管网的数学模型,应用拉普拉斯变换方法,经过一系列的数学演算过程,最后得出描述环形输气管网内气体瞬变流的规律之数学表达式,为了得到实际上的应用,再将这些数学表达式进行一系列运算,转变成易于用计算机进行计算的公式;然后编制出计算程序;最后给出实例,打印出计算结果;并绘制了管网内压力随时间和管长的变化曲线。更多还原

【Abstract】 On the basis of the generalized equation of unsteady flow (transient flow )in complex natural-gas pipelines,combined with the real conditions, this paper presents the mathematical models of gas transient flow in single loop pipeline networks and two-loop in parallel pipeine networks,and then applies the method of Laplace Transform, and after making a series of mathematical calculations, derives the formulas describing the laws of gas transient flow in gas loop pipeline networks. In order to make it possible to apply the formulas to production practice, computer programs are compiled. Finally, real examples and their calculation results are given, by which the pressure curves depending on pipe-length and time are drawn.更多还原