为研究管壳式熔盐空气换热器U型管弯管段受空气冲击诱导振动响应特性,依托中国科学院战略性先导科技专项——钍基熔盐堆核能系统(Thorium Molten Salt Reactor, TMSR)综合仿真实验平台,采用单管双向流固耦合方法进行仿真.计算加速度值与实验值较为吻合,误差范围为?12%~15%,证明了单管双向流固耦合方法分析换热管流致振动问题的可行性.数值模拟还表明:流致振动具有在初始0.06 s 时间内空气流动和传热管位移趋于稳定和外扩-回弹的周期性变化等特征,最终将在一微小区间内做"8"字往复运动.%[Background] The molten-salt-air heat exchanger is an important part of thorium molten salt reactor (TMSR) integrated simulation platform based on strategic priority research program of Chinese Academy of Sciences, and the flow-induced vibration problem of heat transfer tube in this heat exchanger is critical. Furthermore, the analysis of fluid-structure interaction is currently few and unreliable. [Purpose] This study aims at the flow-induced vibration response characteristics of U-type heat pipe in shell and tube heat exchangers. [Methods] Numerical simulation was operated based on two-way fluid-structure interaction, and the calculated results are compared with experimental data to judge the feasibility of this method. [Results and Conclusion] The relationship between acceleration values are consistent, the error between experimental data and calculated results is in the range of about?12% to 15%, shows that flow-induced vibration analysis of single-tube based on two-way fluid-structure interaction method is feasible. Numerical simulation has also indicated that in the initial period of 0.06 s air flow and displacement of heat transfer tube tend to be stable, the U-type tube has periodic variation characteristics of expand-rebound. Finally, the reciprocating motion of tube tends to be a shape of number "8".
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