ABSTRACT

The effects of the variation of the viscoelastic pipe material properties on the transient pressure wave propagation are investigated through laboratory and numerical tests. The used experimental set-up consists of a series of a high-density polyethylene (HDPE) pipe with an oriented polyvinyl chloride (PVC-O) pipe. A pulse and a step pressure wave are introduced in the system using an automatically controlled butterfly valve. A numerical model calibrated on the experimental results is used to investigate the effects of each parameter of a standard linear viscoelastic model on the pressure wave reflection. Results show that the reflection coefficient at the junction between the two pipes depends on all the viscoelastic parameters and on the transient time-history. The analysis of the negative pulse wave propagation reveals a pressure head increase in the pipe due to the retarded strains, which cannot be explained by an elastic model.

摘要

通过实验室和数值试验研究了粘弹性管道材料性能变化对瞬态压力波传播的影响。所使用的实验装置由一系列高密度聚乙烯（HDPE）管和定向聚氯乙烯（PVC-O）管组成。使用自动控制的蝶阀将脉冲和阶跃压力波引入系统。根据实验结果校准的数值模型用于研究标准线性粘弹性模型的每个参数对压力波反射的影响。结果表明，在两个管道之间的交汇处的反射系数取决于所有粘弹性参数和瞬态时间历史。