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Effect of the flow approach angle on the dynamics of loosely-supported tube arrays
Nuclear Engineering and Design ( IF 1.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.nucengdes.2020.110802
Amro Elhelaly , Marwan Hassan , Atef Mohany , Soha Eid Moussa

Abstract This paper presents an investigation of the dynamics of loosely supported tube arrays subjected to cross-flow. Of special interest is the effect of the flow approach angle, as well as the clearances between the tubes and their supports, on the fretting wear parameters such as the impact force and the tube response level. Experiments were conducted in an air tunnel on triangular and square tube arrays with a pitch-to-diameter ratio of 1.5 and 1.73, respectively. The interaction between the fluidelastic instability and the acoustic resonance was illustrated. It was found that (i) both the vibration response and the measured force level were highly dependent on the support clearance, and (ii) the presence of acoustic resonance decreased the vibration amplitude and the impact force level. This is due to the interaction between the acoustic particle velocity, the required flow redistribution and the time lag with the tube motion to sustain fluidelastic instability.

中文翻译:

流动接近角对松散支撑管阵列动力学的影响

摘要 本文介绍了受错流影响的松散支撑管阵列的动力学研究。特别令人感兴趣的是流动接近角以及管与其支撑件之间的间隙对微动磨损参数(例如冲击力和管响应水平)的影响。实验是在空气隧道中进行的,三角形和方形管阵列的间距直径比分别为 1.5 和 1.73。说明了流体弹性不稳定性和声学共振之间的相互作用。发现 (i) 振动响应和测量的力水平都高度依赖于支撑间隙,并且 (ii) 声学共振的存在降低了振动幅度和冲击力水平。
更新日期:2020-11-01
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