LNG独立C型液舱晃荡特性试验研究

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刘戈,林焰,管官,李冰.LNG独立C型液舱晃荡特性试验研究[J].,2017,57(5):467-475

LNG独立C型液舱晃荡特性试验研究

Experimental study of sloshing pattern on LNG independent C type tank

DOI：10.7511/dllgxb201705005

中文关键词:晃荡独立C型液舱 LNG加注船试验研究

英文关键词:sloshing independent C type tank LNG fuel bunker vessel experimental study

基金项目:工业和信息化部高技术船舶科研计划资助项目(工信部联装2014498号)；海洋可再生能源专项资金资助项目(QDME2013ZB01)；国家自然科学基金资助项目(51609036)；中国博士后科学基金资助项目(2014M5612342015T80256)；辽宁省博士科研启动基金资助项目(201501176)；中央高校基本科研业务费专项资金资助项目(DUT16RC(4)26).

作者	单位
刘戈,林焰,管官,李冰

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中文摘要:

与LNG运输船不同，LNG加注船的液舱会经常处于部分装载状态，故液舱晃荡问题必须予以考虑．由于目前LNG加注船主要采用独立C型液舱，针对该种形式液舱，使用模型试验，系统研究了不同载液高度、激励频率及激励幅值影响下的晃荡情况．讨论分析了其晃荡时自由液面的波形特征，对中间液深工况下，自由液面在舱顶的影响下出现的波形进行分类．通过对晃荡荷载的统计分析，发现产生最大荷载的激励频率与理论固有频率有所偏差，且该偏差会随着液位的升高而降低．此外，在荷载空间分布方面，载液高度为0.6 D i( D i为模型液舱直径)时，自由液面在封头处破碎严重，会对液舱封头上部产生较大冲击；而在0.8 D i载液高度时，应充分考虑0.8 f n( f n为理论固有频率)至1.2 f n激励区间内的顶部冲击荷载．

英文摘要:

Being different from the LNG carrying ship, the tanks of LNG fuel bunker vessel are always partially loaded, so the sloshing must be considered. Since independent C type tank is widely used in LNG fuel bunker vessel at present, model experiments with this type of tank are carried out for sloshing research. The test conditions cover different filling levels, excitation frequencies and excitation amplitudes. The characteristic of free surface shape is discussed and analyzed. Furthermore, in the intermediate depth, classification of wave shapes, which is influenced by tank roof, is identified. With the statistical analysis of sloshing load, it is found that there is deviation between the excitation frequency inducing maximum load and theoretical natural frequency. This deviation will reduce as the filling level increases. In addition, on aspect of spatial distribution of sloshing load, the free surface under 0.6 D i ( D i is the diameter of the model tank) filling level strongly breaks up and large impact pressure will be expected at upper part head; under 0.8 D i filling level the roof impact pressure with the excitation frequency between 0.8 f n ( f n is theoretical natural frequency) and 1.2 f n should be taken full account.

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LNG独立C型液舱晃荡特性试验研究

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