摘要
采用大涡模拟方法,分析了亚临界雷诺数为3 900时三角形排列波浪锥柱的横流向间距比和顺流向间距比对其升阻力特性、尾流干涉效应及三维流动结构等的影响.结果表明,上游2个波浪锥柱的升阻力特性受下游波浪锥柱影响较小,下游波浪锥柱处于上游双波浪锥柱尾流中,其升阻力特性受横流向间距比和顺流向间距比影响更为显著.3个波浪锥柱间的流动状态可分为邻近干扰、漩涡撞击和涡相互作用状态.在漩涡撞击状态下,上游波浪锥柱尾涡得以发展充分,周期性撞击在下游波浪锥柱表面,从而产生较大的脉动升力.横流向间距比、顺流向间距比分别为3和6时,下游波浪锥柱脉动升力系数较单直圆柱提升了20.93倍.
The large eddy simulation method was employed to numerically investigate the effects of the transverse spacing ratios and the streamwise spacing ratios on the lift and drag characteristics,wake interference and three-dimensional flow structures of the triangular arrangement of wavy conical cylinders with the subcritical Reynolds number of 3900.The results show that the downstream wavy conical cylinder has little influence on the lift and drag characteristics of the two upstream wavy conical cylinders.The downstream wavy conical cylinder is located in the wake of the two upstream wavy conical cylinders,and its lift and drag characteristics are significantly affected by the transverse and streamwise spacing ratios.The flow regimes between the three wavy conical cylinders can be divided into neighboring interference,vortex impingement and vortex interaction.In the vortex impingement regime,the wake vortex of the upstream wavy conical cylinders is fully developed and periodically impinges on the surface of the downstream wavy conical cylinder,resulting in a large fluctuating lift.With the transverse spacing ratio of 3 and the streamwise spacing ratio of 6,the lift fluctuation of the downstream wavy conical cylinder is enhanced by 20.93 times compared with that of the single cylinder.
作者
邹琳
吴伟男
王家辉
郑云龙
徐汉斌
Zou Lin;Wu Weinan;Wang Jiahui;Zheng Yunlong;Xu Hanbin(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430000,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期224-231,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金面上资助项目(11972268,12372232)。
关键词
波浪锥柱
三角形排列
大涡模拟
流动结构
振动增强
wavy conical cylinders
triangular arrangement
large eddy simulation
flow structures
vibration enhancement
