摇摆周期对板式换热通道内汽-液两相流阻力影响研究  

Research on resistance of steam liquid two phase flow in plate heat exchanger

作　　者：李常伟[1] 徐国栋 孙启 LI Chang-wei;XU Guo-dong;SUN Qi(Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011

出　　处：《舰船科学技术》2021年第17期90-94,共5页Ship Science and Technology

摘　　要：板式换热设备越来越广泛应用于船舶换热系统,其内部结构为窄矩形通道,高功率换热条件下,可能形成汽-液两相流,汽-液两相流的阻力特性影响着换热性能。因此,在海洋摇摆条件下,竖直窄矩形通道内汽-液两相流阻力特性研究成为船舶换热方面一个研究热点。实验结果表明,摇摆角度等其他因素不变,阶段性增加摇摆周期,试验段总压力减小,压差变化频率减小,周期性明显增加。通过理论分析,摇摆周期增加,摩擦压降频率和幅值不变;重位压降变化频率减小,幅值不变;附加压降变化频率减小,幅值减小。造成总压降幅值逐渐减小,变化频率逐渐较小,周期性越来越明显。More and more plate heat exchange equipment is used in ship heat exchange system,Its internal structure is in the form of a narrow rectangular channel,Under high power heat exchange conditions,May form a vapor-liquid two-phase flow,The resistance characteristics of vapor-liquid two-phase flow affect the heat transfer performance.Therefore,under ocean sway conditions,Research on the resistance characteristics of vapor-liquid two-phase flow in vertical narrow rectangular channels has become a research hotspot in ship heat transfer.The experimental results show that the rocking angle and other factors remain unchanged,the rocking period is increased in stages,the total pressure of the test section is reduced,the frequency of pressure difference changes is reduced,and the periodicity is obviously increased.Through theoretical analysis,the oscillation period increases,the frequency and amplitude of the friction pressure drop remain unchanged;the frequency of the reposition pressure drop changes,and the amplitude remains the same;the additional pressure drop changes frequency and the amplitude decreases.As a result,the amplitude of the total pressure drop gradually decreases,the frequency of change gradually becomes smaller,and the periodicity becomes more and more obvious.

关 键 词：海洋条件 摇摆周期 汽-液两相流 竖直窄矩形通道 阻力特性 

分 类 号：U664.5[交通运输工程—船舶及航道工程]