鉴于脉动强化换热技术在提高船舶设备换热性能及除垢等方面具有广泛的应用前景，本文针对低频脉动流进行强化换热研究。实验在板式换热器冷却水端上游加入以电磁阀为脉动源的脉动流，以强化换热比表征换热效果，并改变脉动流的雷诺数、脉动频率、脉动振幅，探究各脉动参数与强化换热效果之间的关系。实验结果表明，脉动流具有强化换热效果，其强化换热能力与流体流动状态、脉动频率等因素有关；在某些工况下，脉动流会导致弱化换热。
In this paper, the low-frequency pulsating flow on the intensified heat transfer is studied in view of the application of pulsating intensified heat transfer technology has a wide application prospect in improving the heat transfer performance and scale removal of ship equipment. The pulsating flow with the electromagnetic valve as the pulsating source is added to the upstream of the cooling water end of the plate heat exchanger. The heat exchange ratio Em was used to characterize the heat transfer effect. Change the Reynolds number, pulsation frequency and pulsation amplitude of the pulsating flow to explore the relationship between the pulse parameters and the heat exchange effect. The experimental results show that the pulsating flow has the effect of enhanced heat transfer. Its enhanced heat transfer capacity is affected by the fluid flow state, pulsating frequency and other factors. In some cases, pulsating flow can lead to weaken heat transfer. In some cases, pulsating flow will lead to heat transfer weakening.
2019,41(2): 106-109 收稿日期：2018-01-30
DOI：10.3404/j.issn.1672-7649.2019.02.021
分类号：TK124
作者简介：王军(1978-),男,副教授,研究方向为船舶轮机设备及系统性能优化,船舶数字化设计
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