Numerical Simulation on the Flow-Induced Vibration of Two Square Cylinders in Staggered Arrangement

Yidong Wu, Li Shi, Xinxin Wu, Xiaoxin Wang
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Abstract

Based on the design of the heat transfer tube bundles with square cross section of the steam generators in the high temperature reactor-pebble bed modules (HTR-PM), the flow-induced vibration (FIV) of two single-degree-of-freedom (SDOF) square cylinders in staggered arrangement were investigated to guide the design, processing and manufacture of heat transfer components. Numerical simulation on the FIV of two square cylinders in staggered arrangement was carried out at Reynolds number Re = 100 with the mass ratio of 20. The wake structures of two square cylinders in different arrangements were analyzed. Three distinct flow regimes, i.e. one single-street modes S-I and two double-street modes T-I and T-II, are identified based on Strouhal numbers and flow structures. The amplitude and frequency of FIV response and the lift coefficient of two square cylinders at Ur = 1–30 were obtained to analyze the FIV behavior. The results show that upstream cylinder in the arrangements of mode S-Ia① and S-Ia② is prone to galloping while downstream cylinder in the arrangements of mode S-Ia③ and T-I is prone to galloping. The VIV amplitude of downstream cylinder in most staggered arrangements is much larger than that of single square cylinder while the VIV of upstream cylinder is suppressed.
交错排列两方圆柱流激振动的数值模拟
在高温反应器-球床模块(HTR-PM)蒸汽发生器方截面传热管束设计的基础上,研究了两个单自由度交错排列的方柱体的流激振动(FIV),为传热元件的设计、加工和制造提供指导。在雷诺数Re = 100、质量比为20的条件下,对交错排列的两方圆柱体的流场进行了数值模拟。分析了两种不同排列方式的方形圆柱尾迹结构。根据Strouhal数和流动结构,确定了三种不同的流动模式,即一种单街道模式S-I和两种双街道模式T-I和T-II。得到了两方圆柱在Ur = 1 ~ 30时的FIV响应幅值和频率以及升力系数,分析了其FIV行为。结果表明:S-Ia①和S-Ia②型布置的上游柱体易发生驰动,S-Ia③和T-I型布置的下游柱体易发生驰动。在大多数交错排列中,下游圆柱体的涡激振动幅值远大于单个方形圆柱体,而上游圆柱体的涡激振动受到抑制。
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