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CLC number: U661.7

On-line Access: 2018-10-08

Received: 2017-05-18

Revision Accepted: 2017-12-07

Crosschecked: 2018-08-16

Cited: 0

Clicked: 2099

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Ge Liu

https://orcid.org/0000-0003-4140-1081

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Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.10 P.758-773

http://doi.org/10.1631/jzus.A1700268


Numerical research on the anti-sloshing effect of a ring baffle in an independent type C LNG tank


Author(s):  Ge Liu, Yan Lin, Guan Guan, Yan-yun Yu

Affiliation(s):  School of Naval Architecture, Dalian University of Technology, Dalian 116024, China; more

Corresponding email(s):   linyanly@dlut.edu.cn

Key Words:  Sloshing, Ring baffle, Independent type C liquefied natural gas (LNG) tank, Parameter sensitivity


Ge Liu, Yan Lin, Guan Guan, Yan-yun Yu. Numerical research on the anti-sloshing effect of a ring baffle in an independent type C LNG tank[J]. Journal of Zhejiang University Science A, 2018, 19(10): 758-773.

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Abstract: 
Liquid sloshing can be suppressed by the installation of baffles. The influence of a ring baffle on sloshing reduction is investigated based on an analysis of parameter sensitivity through computational fluid dynamics (CFD) simulation. Firstly, a series of liquid sloshing experiments with a liquefied natural gas (LNG) independent type C model tank is designed to validate the numerical method. Four definition parameters of the ring baffle, the height (H), the position installation (P), the inclined angle (θ), and the thickness (t), are selected as effective factors, and the efficiency of sloshing reduction is used as the comparison criterion. Research cases of parameter sensitivity are designed by orthogonal tests and computed by a validated numerical method. It is found that the thickness has little effect but the other parameters, especially the height, have significant influence in suppressing sloshing. The directions of improvement of the significant actors are analyzed. The effective height of the ring baffle is discussed numerically with different excitation angles. It is demonstrated that increasing the height of the ring baffle will not bring further improvement in efficiency of sloshing reduction after it exceeds 20% of the tank diameter.

In this manuscript, the authors presented their numerical and experimental findings of antisloshing effect of ring baffle in LNG tank at different conditions in cylindrical vessel subjected to pitch excitation. They have studied the effectiveness of ring type baffle in terms of position, height and orientation of the baffle by monitoring the slosh induced pressure as quantitative measure. The snapshots of liquid free-surface were compared against their experimental findings.

LNG独立C型罐制荡环的制荡效应数值研究

目的:制荡挡板由于其安装方便并可以大幅减弱液舱半载时的晃荡效应而备受关注. 本文基于试验验证的计算流体动力学方法,对环型挡板的制荡效应影响因素进行分析,以确定环形挡板中影响制荡效率的主要参数.
创新点:1. 通过正交设计与数值模拟的结合,得到影响环形挡板制荡效率的主要因素. 2. 结合正交试验的分析结果及环形挡板制荡机理数值分析,得出改进环形挡板制荡效率的方案.
方法:1. 通过物理试验对数值模拟方法进行验证; 2. 通过正交试验设计,制定环形挡板参数的数值试验表(表7),并根据计算结果,对参数的制荡效率影响进行分析(表8和9); 3. 对主影响参数进行重点分析,得出其制荡效率的变化规律(图19); 4. 对环形挡板的制荡机理进行分析,并对正交试验结果中各参数水平的影响进行验证.
结论:1. 环形挡板的高度、倾斜角度以及安装位置均对其制荡效率有显著影响,而环形挡板的厚度影响较小. 2. 环形挡板的4个参数中,高度因素的影响效果最显著,但是,当高度增至罐体直径的20%时,制荡效率提升速度变得不明显. 3. 相比于倾斜挡板会产生较多涡流耗散,当环形挡板处于竖直状态时,其较强的阻隔效应可以提供更多的制荡效果;挡板倾斜的方向对制荡效果有一定的影响,但该影响会随着倾斜角度的增大而减小. 4. 增大两个环形挡板的间距,将增加自由液面的长度,并延缓挡板约束流速的效率,从而减弱挡板的制荡效果.

关键词:晃荡;环形挡板;LNG独立C型罐;敏感性分析

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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