质量比对D形截面柱体流致振动的影响
THE INFLUENCE OF MASS RATIO ON FLOW-INDUCED VIBRATION OF D-SECTION PRISMS
宋吉宁 1李壮 1蒋学炼 1金瑞佳 2刘宇航1
作者信息
- 1. 天津城建大学天津市软土特性与工程环境重点实验室,天津 300384
- 2. 交通运输部天津水运工程科学研究院,港口水工建筑技术国家工程研究中心,天津 300456
- 折叠
摘要
利用涡激振动进行海流能收集的VIVACE装置是新能源领域的研究热点.应用FLUENT软件采用k-ω SST湍流模型和Newmark-β法,通过数值模拟探究了四个质量比(2,5,7 和 10)在迎流角 90°下D形截面柱体的流致振动响应,系统分析了D形截面柱体在横流向上的振动幅值、频率、平衡位置偏移量、尾涡脱落模式以及能量转化效率.所模拟的雷诺数范围为 288～2880,对应的约化速度为 2～20.结果表明,质量比对D形截面柱体流致振动的影响明显,质量比会改变D形截面柱体流致振动的响应分支.质量比越大,D形截面柱体进入驰振对应的约化速度越低;质量比增大,D形截面柱体平衡位置偏移量相对减小.随着约化速度的增大,D形截面柱体出现了涡激振动、涡激振动-驰振及完全驰振等响应分支.在所模拟的范围内,D形截面柱体高能量转化效率出现在涡激振动分支,而不是在驰振分支;在质量比为 10 且约化速度为 4.5 时,一级能量转化效率达到最大值44%.相关研究可为VIVACE装置的振子选型提供参考.
Abstract
The utilization of vortex-induced vibration for harvesting oceanic kinetic energy with VIVACE device has emerged as a research hotspot in the field of renewable energy.Utilizing FLUENT software with k-ω SST turbulence model and Newmark-β method,the flow-induced vibration characteristics of a D-section prism were investigated at an incident flow angle of 90°with four different mass ratios(2,5,7,and 10).The study systematically analyzed the vibration amplitude,frequency,average displacement,shedding modes of wake vortices,and energy conversion efficiency of the D-section prism.Simulations were conducted over a Reynolds number range of 288 to 2880,corresponding to reduced velocities of 2 to 20.Results revealed that the mass ratio can significantly influence the flow-induced vibration response of the D-section prism.As the mass ratio increases,the cylinder is more prone to galloping.With increasing mass ratio,the cylinder exhibited phenomena such as vortex-induced vibration,vortex-induced vibration-gallop,and lock-in galloping.Moreover,it was observed that the device achieves higher energy conversion efficiency when the cylinder was in the vortex-induced vibration branch other than the galloping branch.The first-stage energy conversion efficiency reaches a maximum value of 44%at mass ratio of 10 and reduced velocity of 4.5.These findings provide insights into oscillator selection for VIVACE devices.
关键词
质量比/D形截面柱体/涡激振动能量俘获装置/数值模拟/流致振动Key words
mass ratio/D-shaped prism/VIVACE/numerical simulation/flow-induced vibration引用本文复制引用
基金项目
国家自然科学基金(51509178)
国家自然科学基金(51779172)
中央高校基本科研业务费专项(TKS20230106)
出版年
2024
NETL
NSTL
万方数据