Damping of pressure pulsations in CANDU fuel bundles

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。这些问题通常是由于使用往复泵和/或阀门的动态不稳定引起的，这可能是不必要的噪音和振动的来源。如果脉冲源的频率与管道系统的共振频率相对应，则可能会导致非常危险的声学共振情况。这可能会产生极大的压力波动，通常是主管道中流体动态水头的几倍，以及管道系统和周围部件的大幅振动。到目前为止，文献中存在的几乎所有声学减振装置都是为了缓解包含气流的管道和管道系统中的压力脉动而开发的。然而，水流中的流动声学条件与空气流动有很大的不同，因此这些减振装置对CANDU燃料束压力脉动的适用性和有效性尚不清楚。为了弥合这一知识空白，推进当前的技术水平，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，并为核电厂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.