Step-Orifice Applied in Nuclear Piping System
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摘要: 针对大亚湾核电站安全壳喷淋系统(EAS)试验管线节流孔板气蚀引起的管道剧烈振动和噪音,以及支管疲劳破坏这一事例,研究了气蚀引起管道振动的分析方法,以及采用多级节流孔板减小气蚀的设计方法。对气蚀引起的管道振动,采用计算流体动力学(CFD)方法分析孔板附近的流动特性和压力分布,确定节流孔板下游是否发生气蚀现象;对于发生气蚀现象的节流孔板,提出采用多级节流孔板来减弱气蚀,并采用各级节流孔板气蚀数相近的原则确定节流孔径。通过对改造后的EAS试验管线的试验证实,采用本文的设计分析方法设计的多级节流孔板能够有效地减小节流孔板气蚀引起的管道系统振动和噪音。Abstract: Taking the EAS test pipeline in Daya Bay Nuclear Power Station as an example, this paper studies the method for the analysis of piping vibration caused by the cavitations and the design method by using the step-orifice to reduce the cavitations. Using the CFD method, the flow characteristics and pressure distribution around the orifice are studied to determine if the cavitations occurs in the downstream of the orifice. Finally, the cavitation number approximate criteria for step-orifice are adopted to redesign a new throttle orifice. It has been proved that the redesigned step-orifice can effectively reduce the piping vibration and noise.
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Key words:
- Step-orifice /
- Cavitation /
- Nuclear piping /
- Vibration
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