气垫效应对三体船连接桥砰击载荷的影响  

Effects of air cushion on slamming load of trimaran cross-deck structure

作　　者：姜宜辰 孙振东 宗智[1,2,3] 孙一方 金国庆 JIANG Yichen;SUN Zhendong;ZONG Zhi;SUN Yifang;JIN Guoqing(School of Naval Architecture Engineering,Dalian University of Technology,Dalian 116024,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China;Liaoning Engineering Laboratory for Deep-Sea Floating Structures,Dalian 116024,China)

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]高新船舶与深海开发装备协同创新中心,上海200240 [3]辽宁深海浮动结构工程实验室,辽宁大连116024

出　　处：《中国舰船研究》2021年第5期197-205,共9页Chinese Journal of Ship Research

基　　金：青岛海洋科学与技术国家实验室开放基金资助项目(QNLM2016ORP0402);国家自然科学基金资助项目(51679037,51279030);国家自然科学基金重点项目资助(51639003);工业和信息化部高技术船舶专项基金资助项目;国家重点基础研究发展计划资助项目(2013CB036101)。

摘　　要：[目的]高海况下三体船连接桥底板易发生砰击现象,会在局部产生极大的砰击载荷从而造成结构破坏。为分析气垫效应对三体船连接桥砰击载荷的影响并提出连接桥底板的降载结构设计,开展相关研究。[方法]针对三体船入水砰击运动,使用计算流体力学方法对三体船分段入水过程中两相流问题进行模拟。首先,通过与模型试验中砰击载荷和下落加速度进行对比,验证了数值模型的可靠性;其次,分析空气垫效应对三体船连接桥砰击载荷的影响,通过限制流域尺寸以降低气体逃逸速度来强化气垫效应,证实了气垫的重要性;最后,研究了不同形状连接桥底部封板对降低砰击载荷的效果。[结果]结果表明:三体船入水会产生两次砰击峰值,分别为底部砰击峰值和连接桥砰击峰值。矩形间隔排列的封板相较于其他形状封板降载效果更加明显,降载幅度达到约20%。[结论]考虑气垫效应对砰击载荷预报有重要影响,在三体船连接桥的设计中,使用矩形间隔排列的封板可有效降低砰击载荷对船体结构的破坏。[Objectives]The hull plate of a trimaran cross-deck bottom is often subjected to slamming loads under high-level sea conditions,potentially causing severe structural damage.The objective of this study is to analyze the influence of the air cushion effect on the impact load of a trimaran cross-deck plate and propose a new type of hull plate for the cross-deck bottom in order to reduce the slamming load.[Methods]The two-phase flow problem of a trimaran ship section is simulated using the computational fluid dynamics(CFD)method.First,the accuracy of the numerical model is verified by comparing the predicted results with the ex-perimental measurements.The influence of the air cushion on the slamming load of the trimaran cross-deck structure is then obtained by analyzing the evolution of the flow field.Finally,the influence of the air cushion is analyzed and the effects of different shapes and sizes of the proposed hull plate are evaluated.[Results]The numerical results show two slamming peaks that appear during the process of a trimaran en-tering the water.The rectangular shaped plate reduces the slamming load by around 20%compared with the flat plate bottom.[Conclusions]The air cushion has a significant effect on the slamming load.A rectangu-lar shaped hull plate can be used to cover the trimaran cross-deck bottom.

关 键 词：砰击 数值模拟 三体船 空气垫 降载底板 

分 类 号：U661.3[交通运输工程—船舶及航道工程]