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摇摆条件下窄通道内单相水流态转捩特性

DOI: 10.3969/j.issn.1006-7043.201107024

Keywords: 摇摆运动, 矩形窄通道, 流态转捩, 单相水, 可视化

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Abstract:

矩形窄通道广泛应用于紧凑式换热器中,其内单相流动流态转捩特性会受到摇摆运动的影响.结合流迹显示技术,对摇摆条件下矩形窄通道内单相水从层流向湍流转变临界点附近的流动特性进行了实验研究.结果表明稳态条件下临界??Re为2 550左右.摇摆条件下当Re小于2 400时,流态显示为稳定的层流,Re大于3 500时,流态为湍流,摇摆对稳定的层流区和湍流区流态没有影响;Re??为2 400~3 500之间时流动处于过渡区,摇摆对其流态转变有一定影响.在临界点附近摇摆振幅越大,流态转捩越容易发生;摇摆周期对流态转捩影响很小.摇摆运动改变系统重位压降及产生附加压降,从而对流态转捩的影响不可忽视.

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