瞬变流中 MIAB 摩阻模型的数值模拟研究

摘要

Hydraulic transient phenomenon is the main problem need to be considered in safe operation of long-distance water transportation system. Because of the traditional "quasi-steady" model can not accurately predict the peak of pressure wave and the decay process of water hammer wave, so the introduction of a more accurate simulation of unsteady friction model transient flows become an important content in project safe operation re-search. In this paper,based on model test,numerical simulation was carried out by using a constant friction model and MIAB friction model,quan-titatively analyzed the agreement between the calculated results of two kinds of model and the measured pressure value,then,the priority order of models was discussed by comparative analysis. It put forward a method to further improve the MIAB friction model simulation accuracy by improving the empirical formula of Brunone friction coefficient k ,field correction of velocity and friction coefficient f and researching the transient flow charac-teristics of complex long distance water supply system.%水力瞬变现象是长距离输水系统安全运行时需要考虑的主要问题。由于传统“拟稳态”模型不能准确预测压力波的峰值以及水锤波的衰减过程，因此引入更准确的非恒定摩阻模型模拟瞬变流成为工程安全运行研究的重要内容。本文利用模型试验，通过采用恒定摩阻模型及 MIAB 摩阻模型进行数值模拟计算，定量分析了两种模型的模拟计算结果与实测压力值的吻合程度，对比分析模型的优劣，提出了通过改进 Brunone 摩阻系数 k 的经验公式、现场校正波速和摩阻系数 f 及研究长距离复杂供水系统的瞬变流动特性，以期进一步提高 MIAB 摩阻模型模拟计算精度。