Investigation of the acoustic pressure pulsations in piping system and their effect on the dynamic response of CANDU fuel bundles

管道系统声压脉动及其对 CANDU 燃料棒束动态响应的影响研究

• 批准号: 488610-2015
• 负责人: Mohany, Atef
• 金额: $ 7.25万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618466
• 关键词: Investigation; acoustic; pressure; pulsations; piping

Piping systems used in industrial applications such as power stations are liable to generation of pressure pulsations, often arising from the use of reciprocating pumps and/or dynamic instability of valves, which can act as sources of unwanted noise and vibration. In the event that the frequencies of these pulsating sources correspond to the resonant frequencies of the piping system, a very dangerous acoustic resonance condition can result, which can produce extremely large pressure fluctuations, often several times the dynamic head of the flow in the main pipe, as well as substantial vibration of the piping system and surrounding components. These conditions, referred to as Acoustic Induced Vibrations (AIV), can lead to issues with leakage due to gasket and seal ruptures, valve failure, and in serious cases, fatigue and fracture of the piping system, related components and instrumentation. An example of such failure which had a great impact to Ontario Power Generation's (OPG) production was related to CANDU nuclear fuel bundle failures. In 1990, one of the fuel bundles in the Darlington nuclear power plant was damaged as a result of excessive vibration of the fuel elements. Therefore, the main objectives of this project are to experimentally investigate the effectiveness of passive acoustic damping devices on the attenuation of acoustic pressure pulsations in piping system and to numerically simulate the dynamic response of CANDU fuel bundle due to acoustic pressure pulsations. The gained knowledge from this research will provide practical design guidelines for implementation of new passive acoustic damping devices in piping systems to prevent the occurrence of acoustic pressure pulsations. Moreover, a more realistic three dimensional model for predictions of the fuel bundle vibration response to fluid excitations and acoustic pressure pulsations will be developed. This will not only support the increased safety and reliability of piping systems in nuclear power plants which will directly benefit the Canadian economy, but also could be used in future CANDU reactors to avoid fuel bundle failure due to the aforementioned excitation mechanism.

工业应用中使用的管道系统（例如电站）可能会产生压力脉动的产生，这通常是由于使用往复泵和/或阀门动态不稳定性而产生的，这可以充当不必要的噪声和振动的来源。如果这些脉动源的频率对应于管道系统的谐振频率，则可能会导致非常危险的声学共振条件，这会产生极大的压力波动，通常是主管道中流动的动态头几倍，以及管道系统和周围组件的实质性振动。这些条件（称为声学诱发的振动（AIV））可能导致由于垫圈和密封破裂，阀门故障而引起的泄漏问题，并且在严重的情况下，管道系统的疲劳和断裂，相关组件和仪器。这种失败对安大略省发电公司（OPG）产生产生巨大影响的失败与Candu核燃料束故障有关。 1990年，由于燃料元件的过度振动，达灵顿核电站的燃油捆队之一损坏了。因此，该项目的主要目标是实验研究被动声性阻尼装置对管道系统中声压脉动衰减的有效性，并通过数值模拟由于声压力脉冲而导致的candu燃料束的动态响应。从这项研究中获得的知识将提供实用的设计指南，以实施管道系统中新的被动声性阻尼设备，以防止发生声压力脉动的发生。此外，将开发一个更现实的三维模型，以预测对流体激发和声压力脉动的燃料束振动响应的预测。这不仅将支持核电厂中管道系统的安全性和可靠性，这将直接受益于加拿大经济，而且还可以在未来的Candu反应堆中使用，以避免由于上述激发机制而导致的燃油束故障。