蒸汽发生器传热管束弯管区流致振动试验  

Experimental Study on Flow-Induced Vibration in Bend Zone of Steam Generator Tube Bundle

作　　者：李晓蒙 杨林 LI Xiaomeng;YANG Lin(Beijing HE Energy Storage Technology Co.,LTD,Beijing 102209,China)

机构地区：[1]北京和瑞储能科技有限公司,北京市102209

出　　处：《南方能源建设》2024年第6期94-101,共8页Southern Energy Construction

基　　金：国家电投集团科学技术研究院有限公司科技项目“综合热工水力试验台架-蒸汽发生器传热管束弯管区流致振动试验”(ZHRG-ZB08W20)。

摘　　要：[目的]蒸汽发生器传热管在二次侧流体的冲刷作用下,容易产生流致振动问题,其中随机的湍流作用力是导致传热管振动的主要的机理之一。当流体的脉动压力频率与传热管固有频率相近时,会导致结构共振,长时间振动会导致传热管失效,因此研究传热管在流体激励下的动力响应特点是非常必要的。[方法]文章设计了节径比为1.47的传热管束弯管区流致振动试验装置,用空气-水两相流模拟了二次侧流体工况,分别测量了空泡份额为0.7~0.98,管间流速为5~13 m/s的流体脉动压力和管束振动加速度。[结果]结果表明,在低流速下,脉动压力主频与传热管固有频率接近,容易产生共振,且共振时管束振幅会有所增大。随着管间流速增大,管束受到的脉动压力也相应增大,而随着空泡份额的增大,脉动压力的变化是先增大后减小。在计算空气-水两相流工况下的脉动压力主频时,经验公式中的系数需要进行适当调整。[结论]本试验模拟了蒸汽发生器传热管束弯管区二次侧流体运行工况,在试验本体设计上考虑了与原型的几何相似性与支撑、约束相似性,相比以往的试验研究更接近实际情况,可为工程应用提供设计参考。[Introduction] Under the scouring impact of secondary side fluid,the steam generator tube is prone to flow-induced vibration.One of the main mechanisms leading to tube vibration is the random turbulent force.When the fluctuating pressure frequency of the fluid is close to the natural frequency of the tube,structural resonance will be caused and long-term vibration will lead to the failure of the tube.Therefore,it is necessary to study the dynamic response characteristics of steam generator tubes under fluid excitation.[Method] In this paper,a flow-induced vibration test device for the bend zone of tube bundle with a pitch-diameter ratio of 1.47 was designed.The secondary side fluid condition was simulated by air-water two-phase flow.The fluid fluctuating pressure and the vibration acceleration of tube bundle with a void fraction of 0.7~0.98 and a flow velocity between tubes of 5~13 m/s was measured.[Result] The results show that:the main frequency of fluctuating pressure is close to the natural frequency of tube at low flow velocity,which is easy to causes resonance;when resonance occurs,the amplitude of the tube bundle increases;with the increase of velocity between tubes,the fluctuating pressure on tube bundle increases correspondingly.With the increase of the void fraction,the fluctuation pressure first increases and then decreases.When calculating the main frequency of fluctuating pressure under the condition of air-water two-phase flow,the coefficient in the empirical formula can be adjusted appropriately.[Conclusion] This test simulated the working conditions of the secondary side fluid operation in the bend zone of steam generator tube bundle and considered the geometric similarity with the prototype and the similarity of support and constraint in the design of the model.This test was closer to the actual situation than the previous experimental research and can provide design references for engineering applications.

关 键 词：压水堆核电站 蒸汽发生器传热管 空气-水两相流 脉动压力 湍流激振 

分 类 号：TL3[核科学技术—核技术及应用] TL334[理学—工程力学] TB123[理学—力学]