摘要
在流向振荡圆柱体尾流中施加一个静止的窄条控制件,对尾流涡脱落及作用于柱体的平均和脉动力进行抑制.未加控制情况下,存在非锁频和3种锁频状态的涡脱落模式.流动显示及尾流脉动速度谱和脉动升力谱的分析表明,当控制件位于有效控制区域时,可抑制非锁频和2种锁频状态下的旋涡脱落,并且使脉动升力和平均阻力有明显减少.本文研究了柱体的振频、雷诺数,窄条宽度及阻塞度对有效区的影响并探讨了控制机理.
A narrow strip element is applied in the wake of a circular cylinder in inline oscillation to suppress vortex shedding and reduce fluctuating lift on the cylinder. A non-lock-on mode and three lock-on modes of vortex shedding are found in the wake without element. The results of visualization and spectra analysis of fluctuating velocity in the wake and fluctuating lift on the cylinder show that, the non-lock-on mode and two lock-on modes of vortex shedding can be suppressed, and the fluctuating lift and mean drag on the cylinder can be reduced considerably, if the element is set in effective zones. The influences of Reynolds number, cylinder oscillation frequency, element size, and blockage ratio on the effective zone are investigated, and the suppression mechanism is discussed in the paper.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2014年第9期955-974,共20页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金资助项目(批准号:10872188
11172124)
关键词
抑制
振荡柱体
旋涡脱落
锁频
suppression, oscillating cylinder, vortex shedding, lock-on
