Abstract Water conductor system in hydro power plants experience water hammer or hydraulic transient events regularly and may cause damage of civil and mechanical components. Recently developed viscoelastic pipes such as Glass Reinforced Fibre Plastic (GRP) have been started in use to replace metallic pipes in hydro power and water supply plants. However, studies on combinations of metallic-viscoelastic pipeline behaviour for water hammer conditions are limited especially for varied diameter and combinations of different pipe materials. In this paper, the response of water hammer pressure in metallic-viscoelastic pipeline is investigated experimentally and numerically. Two different pipe materials i.e. Mild Steel (MS) and GRP and their metallic-viscoelastic pipe configuration was used to investigate and analyze the water hammer pressure generation and compared with pressure developed in single material pipeline. An experimental setup was designed and fabricated to carry out the water hammer test. The numerical simulation was carried out by using the method of characteristics (MOC). The GRP pipeline was found more effective to reduce the water hammer pressure and a combination of GRP + MS pipeline (GRP for initial reach having low pressure and MS for later reach having high pressure) in the plants, where GRP pipeline alone cannot be used due to manufacturing limitations of pressure and size, can be used to reduce transient pressure in the water conductor system.

中文翻译：

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两种不同材料及其组合配置管道水锤分析的实验与数值研究

摘要 水力发电厂导水系统经常发生水锤或水力瞬变事件，可能对土建和机械部件造成损坏。最近开发的粘弹性管，例如玻璃纤维增​​强塑料 (GRP)，已开始用于替代水力发电厂和供水厂的金属管。然而，对水锤条件下金属-粘弹性管道行为组合的研究是有限的，尤其是对于不同直径和不同管道材料的组合。本文通过实验和数值方法研究了金属粘弹性管道中水锤压力的响应。两种不同的管材即 低碳钢 (MS) 和 GRP 及其金属粘弹性管配置用于研究和分析水锤压力的产生，并与单一材料管道中产生的压力进行比较。设计并制造了一个实验装置来进行水锤试验。数值模拟采用特征法（MOC）进行。发现 GRP 管道更有效地降低水锤压力和 GRP + MS 管道的组合（GRP 用于初始段的低压和 MS 用于后期的高压），在这些工厂中不能单独使用 GRP 管道不受压力和尺寸的制造限制，可用于降低导水系统中的瞬态压力。设计并制造了一个实验装置来进行水锤试验。数值模拟采用特征法（MOC）进行。发现 GRP 管道更有效地降低水锤压力和 GRP + MS 管道的组合（GRP 用于初始段的低压和 MS 用于后期的高压），在这些工厂中不能单独使用 GRP 管道压力和尺寸的制造限制，可用于降低导水系统中的瞬态压力。设计并制造了一个实验装置来进行水锤试验。数值模拟采用特征法（MOC）进行。发现 GRP 管道更有效地降低水锤压力和 GRP + MS 管道的组合（GRP 用于初始段的低压和 MS 用于后期的高压），在这些工厂中不能单独使用 GRP 管道压力和尺寸的制造限制，可用于降低导水系统中的瞬态压力。