Damping of pressure pulsations in CANDU fuel bundles

在工业应用中使用的管道系统，如发电站和天然气管道，容易产生压力脉动。这些通常是由使用往复泵和/或阀门的动态不稳定性引起的，这可能成为不必要的噪音和振动的来源。如果这些脉冲源的频率与管道系统的谐振频率相对应，则可能导致非常危险的声学谐振条件。这可能会产生极大的压力波动，通常是主管道中流动的动态扬程的几倍，以及管道系统和周围部件的实质性振动。迄今为止，几乎所有文献中存在的声学阻尼装置都是为了减轻管道和管道系统中含有气体流动的压力脉动而开发的。然而，水流中的流声条件与空气中的流声条件明显不同，因此这些阻尼装置在CANDU燃料束中减轻压力脉动的适用性和有效性尚不清楚。为了弥合知识差距和推进当前的最新技术，本项目的主要目标是研究充水管道系统中声压脉动的产生和衰减，并为核电站管道系统中声学阻尼器的实施制定初步设计指南，以防止声压脉动的发生。

Piping systems used in industrial applications such as power stations and natural gas pipelines are liable to generate pressure pulsations. These often arise from the use of reciprocating pumps and/or the dynamicinstability of valves, which can act as sources of unwanted noise and vibration. If the frequencies of thesepulsating sources correspond to the resonant frequencies of the piping system, a very dangerous acousticresonance condition can result. This can produce extremely large pressure fluctuations, often several times thedynamic head of the flow in the main pipe, as well as substantial vibrations in the piping system andsurrounding components. Almost all of the acoustic damping devices that exist in literature to date have beendeveloped to mitigate pressure pulsations in ducts and piping systems that contain gas flow. However, theflow-acoustic conditions in water flow are significantly different from air flow and thus the applicability andthe effectiveness of these damping devices to mitigate pressure pulsations in CANDU fuel bundles is unclear.To bridge the knowledge gap and advance the current state-of-the-art, the main objective of this project is toinvestigate the generation and attenuation of acoustic pressure pulsations in water filled piping system anddevelop preliminary design guidelines for the implementation of acoustic dampers in piping systems of nuclearpower plants to prevent the occurrence of acoustic pressure pulsations.