压力容器2025，Vol.42Issue(9)：25-34,10.DOI:10.3969/j.issn.1001-4837.2025.09.004
松支撑换热管束流致振动的机理研究
Study on flow-induced vibration mechanism of loosely supported tube bundles in heat exchangers
摘要
Abstract
The use of loosely supported tube bundles inevitably increases structural flexibility,which can lead to flow-induced vibration failure in heat exchanger tubes.Collisions and friction between tubes and supports may also result in fatigue,wear,and potentially catastrophic failure.This study aims to investigate the flow-induced vibration characteristics of loosely supported tube bundles.Experiments were conducted in a wind tunnel,focusing on triangularly arranged tube bundles both with and without loose supports.The vibration response and contact forces of a single flexible tube within the bundle were examined under various pitch-to-diameter ratios(1.5 and 1.41)and radial clearances(0.1,0.2,0.3,0.4,0.5,and 0.75 mm).The results show that at reduced velocities of 25.5 and 38.2,the system enters a state of limited instability before reaching full fluid-elastic instability.When the reduced velocity increases to 61.1,the tube vibration transitions from a chaotic state to single-period motion near the critical velocity.Further increasing the reduced velocity to 67.5 leads to double-period motion.Contact forces increase sharply only after the tube bundle eventually enters a state of fluid-elastic instability.Under the experimental conditions,the effect of pitch-to-diameter ratio on the instability characteristics of loosely supported tube bundles was not significant.This study provides a theoretical basis for the safe design of heat exchangers with loosely supported tube bundles.关键词
松支撑/管束/风洞/流致振动Key words
loosely support/tube bundle/wind tunnel/flow-induced vibration分类
机械制造引用本文复制引用
郭凯,庞辉建,马祥超,王文熙,王振勇,张红升..松支撑换热管束流致振动的机理研究[J].压力容器,2025,42(9):25-34,10.基金项目
国家自然科学基金青年项目(22308297) （22308297）
