液体管道瞬变流摩阻的计算方法

在液体管道瞬变流计算中，传统的拟恒定摩阻模型不能准确描述瞬变流的真实物理现象。多年来人们一直在研究瞬变流摩阻的精确表达式和计算方法。总结了液体管道中瞬变流摩阻的计算方法，着重阐述了瞬变流非恒定摩阻问题的主要研究成果，介绍了几类有重要价值的非恒定摩阻模型及相应的应用范围，并给出了各类模型进行数值计算的思路，最后通过算例验证了非恒定摩阻模型比传统的拟恒定摩阻模型能更精确地模拟液体管道瞬变流压力波的衰减和波形畸变。

Calculating Methods of Friction Losses with Transient Flow in Pipe

The traditional quasi-steady friction model can not be accurately described the real transient problems in transient pipe flow. The conventional quasi-steady friction model and the historical approaches proposed for improving the numerical modeling of transient events was summarized in the paper. The solutions of the several unsteady friction models with the well-known method of characteristics were presented. The models were verified for turbulent flows and the unsteady friction models indicated better agreement between measured and computed pressure heads than the conventional quasi-steady friction model. And finally, the more accurate unsteady friction models were applied to simulate transient pipe flow in other pipelines such as crude oil and product oil pipelines.