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。
This paper concentrates on investigating the mechanical stability of a Beam Position Monitor (BMP)support prototype of the Shanghai Synchrotron Radiation Facility(SSRF)project.Both finite element analysis and vibration measurements have been performed.Inconsistent results between the simulations and experiments motivate us to study three connections between the support and the ground:ground bolt(used in the initial design),part grout and full grout(proposed in the later research).After changing the connection, the first eigenfrequency is increased from 20.2Hz to 50.2Hz,and the ratio of the integrated RMS displacement (4—50Hz)is decreased from 4.36 to 1.23 in the lateral direction.The mechanical stability is improved greatly.
