Influence of Bow Design on Ice Resistance for Arctic LNG Carriers  

首部设计对破冰型LNG船冰阻力影响研究

作　　者：WAN Zhong LI Xiao-qing YUAN Yu-chao WANG Jia-ying 万忠;李晓情;袁昱超;王佳颖(上海交通大学船舶海洋与建筑工程学院,上海200240;上海交通大学海洋工程国家重点实验室,上海200240;沪东中华造船(集团)有限公司,上海200129)

机构地区：[1]School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [2]State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [3]Hudong Zhonghua Shipbuilding(Group)Co.,Ltd.,Shanghai 200129,China

出　　处：《船舶力学》2024年第12期1820-1834,共15页Journal of Ship Mechanics

摘　　要：In order to understand the influence of bow shape on ice resistance and provide guidelines for hull line design in the early design stage,an investigation of the impact of bow shape on ice resistance for the Arctic LNG carriers is carried out based on semi-empirical methods.Firstly,some typical semi-empirical formulas developed for ice resistance estimation of cargo carriers in different ice conditions are summarized.Then,formulas appropriate for ice resistance estimation of Arctic LNG carriers under different ice conditions are verified according to the result comparison between semi-empirical formulas and experimental tests.The comparison result indicates that the Lindqvist formula is appropriate for ice resistance estimation in level ice conditions,Zuev and Dobrodeev formula for ice resistance estimation in broken ice conditions,and Dobrodeev formula for ice resistance estimation in brash ice conditions.After that,the parameters considered in the selected formulas are summarized,and the influence of critical parameters on ice resistance is analyzed.Some parameters describing the ship's bow shape characteristic like ship breadth,waterline angle and stem angle greatly influence the ice resistance.Ice resistance increases with both the growth of ship breadth under all ice conditions and the growth of stem angle in level ice and broken ice conditions while ice resistance decreases with the development of waterline angle under all ice conditions.Finally,the optimization of the bow shape is discussed,and an optimized bow shape with both a large waterline angle and low stem angle is proposed.The optimized bow shape can decrease ice resistance by 9.9%in the level ice condition and reduce ice resistance by 11.3%in the brash ice condition.为理解船首形状对冰载荷的影响,同时为前期的船首线型设计提供指导,基于半经验公式法开展船首形状对破冰型LNG船冰阻力的影响研究。首先,总结不同冰况下适用于货船冰阻力估算的半经验公式。然后,根据半经验公式估算结果与冰池试验结果的对比,确定适用于不同冰况下LNG船冰阻力估算的半经验公式。对比结果表明,Lindqvist公式适用于层冰的冰阻力估算,Zuev-Dobrodeev公式适用于破冰航道的冰阻力估算,Dobrodeev公式适用于碎冰航道的冰阻力估算。接着,分析所选公式中关键参数对冰阻力的影响。船宽、水线角、首倾角等描述船首形状特征的参数对船舶的破冰性能影响较大。在所有冰况中,冰阻力均随船宽的增大而增大,冰阻力随水线角的增大而减小。在层冰和碎冰条件下,冰阻力均随首倾角的增大而增大。较小的船宽、较大的水线角和较小的首倾角有利于降低冰阻力。最后,通过增加水线角和减小首倾角对船首形状进行优化,优化船首后的LNG船在层冰工况下可降低9.9%的冰阻力,在碎冰工况下可降低11.3%的冰阻力。

关 键 词：Arctic LNG carrier ice resistance level ice brash ice broken ice semi-empirical formula 

分 类 号：U661.31[交通运输工程—船舶及航道工程]