弹性 / 黏弹性混合管道瞬变流参数校核方法.

To explore the influence mechanism of transient flow pressure fluctuation in the pipeline system with a mixed connection of elastic pipe and viscoelastic pipe in series, a transient flow test rig of elastic / viscoelastic series mixed pipe system was designed and constructed, including galvanized steel pipe system, galvanized steel / polypropylene pipe mixed pipe system, and galvanized steel / polyethylene pipe mixed pipe system. The transient flow experiments were carried out on three kinds of pipeline systems at different initial flow conditions. Based on the experimental data, the parameters of the transient flow model of viscoelastic pipes combined with onedimensional quasi-steady friction model are calibrated, and a method of calibrating transient flow parameters in mixed pipelines was proposed. The results show that replacing part of elastic pipe with viscoelastic pipe can reduce the peak value of transient pressure fluctuation, and the steel tube / PPR mixed pipe has a greater decline than the steel tube / HDPE mixed pipe. In addition, the one-dimensional quasi-steady friction model can simulate accurately the pressure fluctuation of mixed pipes. The method proposed in this paper can be used to calibrate the transient flow parameters of the mixed pipes easily and accurately, which provides a certain reference for the numerical calculation of transient flow in the mixed pipeline in engineering. [ABSTRACT FROM AUTHOR]