ABSTRACT

This study developed the concept of a dual strategy combining the inline and branching techniques; used to upgrade the capacity of existing steel pipe-based hydraulic systems, with respect to the compromise between the attenuation of surge-magnitude and the limitation of period-expansion of the pressure-wave oscillations. Basically, this concept was based on adding a plastic short-penstock to the main steel-pipe and replacing a short in-series short-section of the main-pipe by another one made of plastic material. In this study, the extended 1D water-hammer solver based on the method of characteristics was used for numerical computations. Investigations addressed two plastic material types including High- and Low-Density PolyEthylene (HDPE and LDPE). Results argued that the specific layout of the dual technique using an LDPE material is the most prominent configuration providing an acceptable trade-off between attenuation of the pressure-head surge and limitation of excessive expansion of the period of pressure-wave oscillations.

摘要

本研究提出了结合内联和分支技术的双重策略的概念；用于提升现有钢管液压系统的容量，兼顾浪涌幅度衰减和压力波振荡周期扩展限制。基本上，这个概念是基于在主钢管上添加一个塑料短管，并用另一个由塑料材料制成的短管代替主管的一个短串联短管。本研究采用基于特征法的扩展一维水锤求解器进行数值计算。调查涉及两种塑料材料类型，包括高密度和低密度聚乙烯（HDPE 和 LDPE）。