特征线法分析长距离输油管道的流动瞬变过程

The Dynamic Flowing Variation Process Analyzing of the Long-distance Pipeline by Characteristic Method

本文建立了基于特征线方法求解流动瞬变过程的数值模型,编制了针对长距离输油管道流动瞬变过程的分析软件。在数值处理上,Darcy-Weisbach摩擦力项用二阶精度格式来近似,因此保证了高粘度流体在流动瞬变过程分析时的计算稳定性和精确度。模型考虑了埋管地形对沿线瞬变压力的影响;当某一泵站发生水击后其它站的反应由其站控程序确定。应用该软件,分析模拟了某一长距离输油管道在中间泵站停电或末站瞬时关阀情况下的流动瞬变过程。

Based on the characteristic analyzing method, this paper establishes a numerical model to solve the flowing dynamic variation process. The analytic software of the long-distance oil pipeline is also set up to assure the computational stability and accuracy during the dynamic flowing variation process for high viscosity fluids, the Darcy-Weisbach friction term is discreticized by 2nd-order scheme. Also the present model considers the effect of topology in area of buried pipeline on the dynamic pressure of the pipeline; when a waterhammer occurs at a pump station, the reactions of other stations are determined by their station-controlling program. Finally, under the condition that the intermediary stations' electricity supplies are cut or the end-station shuts up the valve abruptly, the dynamics flowing variation of a long distance oil pipeline is present.