凸台约束对快堆组件流致振动特性影响的实验研究

Experimental Study on Influence of Convex Platform Constraint on Flow-induced Vibration Characteristic of Fast Reactor Assembly

流致振动引起的组件相互碰撞以及流体持续冲刷导致的结构疲劳损伤,会威胁堆芯安全,有必要对快堆组件开展流致振动行为的研究和评价。采用有无固定凸台约束两种方式都会给组件的振动特性带来一定的不确定度。为研究凸台约束对快堆组件流致振动特性的影响,定量评价有无固定凸台约束对组件振动特性带来的不确定度,本文采用实验方法研究了组件上端自由和有0.3 mm间隙的固定凸台约束两种条件下组件的流致振动特性。实验结果表明,组件在有无固定凸台约束条件下最大振幅均方根(RMS)间的相对偏差为6.1%,对于最靠近凸台处测点的幅值,有无凸台约束的最大振幅RMS间的相对偏差为17.4%。本文实验结果对该种复杂支撑条件下组件流致振动行为的分析与评价具有一定的参考价值。

The collision of assemblies caused by flow-induced vibration and the fatigue damage caused by continuous fluid erosion threaten the safety of the reactor core.Therefore,it is necessary to study and evaluate the flow-induced vibration behavior of fast reactor assemblies.The uncertainty of vibration characteristics of assembly can be brought by either method with or without fixed convex platform constraint.In order to study the influence of convex platform constraints on the flow-induced vibration characteristics of fast reactor assembly,and quantitatively evaluate the influence of the presence or absence of convex platform constraints on component uncertainty,the flow-induced vibration characteristics of the assembly under two constraints,free upper end of the assembly and fixed convex platform constrains with 0.3 mm gap,were studied by experimental method in this paper.The experimental results show that the assembly has a relative deviation of 6.1%in maximum amplitude RMS with or without a fixed convex platform constraint,for the amplitude of the measuring point closest to the convex platform constraint,the relative deviation of the maximum amplitude RMS with or without boss constraint is 17.4%.The experimental result has some reference value for the analysis and evaluation of the flow-induced vibration behavior of assembly under such complex support conditions.