检索结果-南通市图书馆

纪念顾懋祥院士海洋工程学术研讨会

作者： HUANG Shan~1 (Department of Naval Architecture and Marine Engineering, University of Strathclyde,100 Montrose Street,Glasgow G4 OLZ,UK)

Experimental investigations have been carried out to examine the effects of triple-starting helical grooves on the drag of fixed circular cylinders and the vortex-induced vibration of elastically supported *** the elastically supported cylinder,the Reynolds number varied from 1.3×10 to 4.6×10,whilst for the fixed cylinder from 3.1×10 to 3.75×10.A comparative approach which allows direct comparisons of the results was adopted where two cylinders of identical dimensions and physical properties with or without helical surface grooves were tested in exactly same experimental set-ups. In the elastically supported cylinder tests,the cylinders were attached to a vertically cantilevered supporting rod and towed in a towing *** the in-line and cross-flow vibrations were *** the fixed cylinder tests,the cylinders were supported on rigid vertical struts and towed horizontally in the same towing *** is found that for the case investigated the helical grooves were effective in suppressing the vortex-induced cross-flow vibration amplitudes with the peak amplitude reduced by 64%.Drag reductions of up to 25%were also achieved in the sub-critical Reynolds number range tested in the study for the fixed cylinders.

关键词： groove vortex induced vibration viv drag reduction viv suppression

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Influences of the Helical Strake Cross-Section Shape on Vortex-Induced Vibrations suppression for A Long Flexible Cylinder

引用

China Ocean Engineering 2017年第4期31卷 438-446页

作者： XU Wan-hai LUAN Ying-sen LIU Li-qin WU Ying-xiang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration Shanghai 200240 China Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

An experimental study on a bare flexible cylinder as well as cylinders fitted with two types of cross-sectioned helical strakes was carried out in a towing tank. The main purpose of this paper is to investigate the effects of strakes’ cross-section on the vortex-induced vibrations （viv） suppression of a flexible cylinder. The square-sectioned and round-sectioned helical strakes were selected in the experimental tests. The uniform current was generated by towing the cylinder models along the tank using a towing carriage. The Reynolds number was in the range of 800–16000. The strain responses were measured by the strain gages in cross-flow （CF） and in-line （IL） directions. A modal analysis method was adopted to obtain the displacement responses using the strain signals in different measurement positions. The comparison of the experimental results among the bare cylinder, square-sectioned straked cylinder and round-sectioned straked cylinder was performed. The helical strakes can effectively reduce the strain amplitude, displacement amplitude, response frequencies and dominant modes of a flexible cylinder excited by viv. And the mean drag coefficients of straked cylinders were approximately consistent with each other. In addition, the square-sectioned and round-sectioned strakes nearly share the similar viv reduction behaviors. Sometimes, the strakes with round-section represent more excellent effects on the viv suppression of response frequency than those with square-section.

关键词： helical strakes viv suppression cross-section shape flexible cylinder

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Vortex-induced vibration response of a circular cylinder surrounded with small rods

引用

Journal of Hydrodynamics 2021年第3期33卷 510-519页

作者： Liang-bin Xu Sheng-ping Liang Zhong-ming Hu Zheng-li Liu Jia-song Wang Research Institute Co. Ltd.China National Offshore Oil CorporationBeijing100083China Department of Engineering Mechanics School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Deepwater Development Ltd. China National Offshore Oil CorporationShengzhen519000China

In this paper,cross-flow vortex-induced vibration(viv)responses of a circular cylinder surrounded with different control rods have been investigated in a wind *** number of rods n is set equal to 3 and 6,and the ratios of diameters d/D(where d is the diameter of small rods,D is the cylinder diameter)are assumed to 0.10,0.16 and *** spacing ratios of s(s=G/D,where G is the gap distance between the main cylinder surface and the control rod surface)are selected as 0.2,0.4 and 0.6 *** Reynolds number based on the main cylinder is in the region of Re=4000–*** show that the viv can be significant suppressed if placing the control rods in appropriate *** the gap between the rod and the main cylinder plays a more important role in the viv amplitude *** the spacing ratio between the rod and main cylinder is 0.2,viv can be best suppressed by 96.7%.However,rods do not always suppress viv and the responses can be more severe in other spacing ratios(s=0.4,0.6).And typical vortex shedding frequency lock-in phenomenon can be *** the spacing ratio is 0.2,other than the natural frequency component,St frequency is also presented in the frequency spectrum of wake velocity.

关键词： Vortex-induced vibration(viv) control rods wind tunnel experiment viv suppression

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Passive viv Reduction of An Inclined Flexible Cylinder by Means of Helical Strakes with Round-Section

引用

China Ocean Engineering 2018年第4期32卷 413-421页

作者： XU Wan-hai QIN Wen-qi HE Ming GAO Xi-feng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

A series of experimental tests of passive viv suppression of an inclined flexible cylinder with round-sectioned helical strakes were carried out in a towing tank. During the tests, the cylinder models fitted with and without helical strakes were towed along the tank. The towing velocity ranged from 0.05 to 1.0 m/s with an interval of 0.05 m/*** different yaw angles(a=0°, 15°, 30° and 45°), defined as the angle between the axis of the cylinder and the plane orthogonal of the oncoming flow, were selected in the experiment. The main purpose of present experimental work is to further investigate the viv suppression effectiveness of round-sectioned helical strakes on the inclined flexible cylinder. The viv responses of the smooth cylinder and the cylinder with square-sectioned strakes under the same experimental condition were also presented for comparison. The experimental results indicated that the roundsectioned strake basically had a similar effect on viv suppression compared with the square-sectioned one, and both can significantly reduce the viv of the vertical cylinder which corresponded to the case of a=0°. But with the increase of yaw angle, the viv suppression effectiveness of both round-and square-section strakes deteriorated dramatically, the staked cylinder even had a much stronger vibration than the smooth one did in the in-line(IL)direction.

关键词： viv suppression Helical strakes inclined flexible cylinder yaw angle round-section

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review on flow-induced vibration of offshore circular cylinders

引用

Journal of Hydrodynamics 2020年第3期32卷 415-440页

作者： Jia-song Wang Dixia Fan Ke Lin Department of Engineering Mechanics School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Hydrodynamics(Ministry of Education) Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering Massachusetts Institute TechnologyCambridgeUSA

As a fundamental fluid-structure interaction(FSI)phenomenon,vortex-induced vibrations(vivs)of circular cylinders have been the center of the FSI research in the past several *** from its scientific significance in rich physics,vivs are paid great attentions by offshore engineers,as they are encountered in many ocean engineering ***,with the development of research and application,wake-induced vibration(WIV)for multiple cylinders and galloping for viv suppression attachments are attracting a growing research *** these phenomena are connected with the flow-induced vibration(FIV).In this paper,we review and give some discussions on the FIV of offshore circular cylinders,including the research progress on the basic viv mechanism of an isolated rigid or flexible cylinder,interference of multiple cylinders concerning WIV of multiple cylinders,practical viv suppression and unwanted galloping for cylinder of ***,we draw concluding remarks,give some comments and propose future research prospects,especially on the major challenges as well as potentials in the offline/online modelling and prediction of real-scale offshore structures with high-fidelity CFD methods,new experimental facilities and applications of artificial intelligence tools.

关键词： Fluid-structure interaction(FSI) vortex induced vibration(viv) wake-induced vibration(WIV) flow-induced vibration(FIV) galloping offshore engineering circular cylinder viv suppression

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：