摘要
该文采用了一种口形截面三螺头螺旋导板用于抑制大质量阻尼比(*m??1.42)圆柱涡激振动,开展了风洞实验研究。针对弹性支撑的圆柱及其附属不同螺距螺旋导板模型,在雷诺数2.7?103-5.29?104范围内,测定相应约化速度下的振动瞬态位移。结果表明:螺距/直径比为5、10和17.5三种螺旋导板圆柱的横向及流向无因次均方根振幅均远小于单圆柱,螺旋导板对大质量阻尼比圆柱的涡激振动有较好的抑制效果,其无因次均方根振幅响应曲线无锁定区,且横向上的抑制效果比流向的抑制效果明显。此外,螺距/直径比为5的螺旋导板具有最佳抑制效果。
A wind tunnel experiment was performed on the suppression of vortex-induced vibration for large mass damping parameter cylinders （ m＊ζ = 1.42 ） attached to a circular cylinder with type-section and 3-start screw head helical strakes. The transient displacement was measured for the flexibly mounted cylinder models with helical strakes at the Reynolds number from 2.7×10^3 to 5.29×10^4. It is shown that the non-dimensional root-mean-square （RMS） response amplitudes of helical strakes cylinders, with three types of pitch to diameter ratios, i.e., 5, 10 and 17.5, in cross-flow and in-flow directions are far less than those of the bare cylinder. Helical strakes have good VIV suppression effect and even there is no lock-in region in the RMS response curves. The VW suppression efficiency in the cross-flow direction is better than that in the in-flow direction. In addition, the helical strake model with the pitch/diameter ratio of 5 performs the best.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2015年第5期533-539,共7页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金(11372188)
国家科技重大专项子课题(2011ZX05026-001)~~
关键词
圆柱
螺旋导板
涡激振动
振动抑制
风洞
circular cylinder
helical strakes
vortex-induced vibration
vibration suppression
wind tunnel
