隔离板对流向振荡圆柱尾流旋涡脱落的抑制

用隔离板对直径为D, 沿流向振荡的圆柱后涡脱落进行抑制. 隔离板放于圆柱尾流中心线上,控制参数包括隔离板长度L/D以及隔离板前缘到柱体振荡中心的距离G/D. 实验的雷诺数范围Re=V_∞D/v=1.01×10⁴～1.69×10⁴,柱体折减振频范围f_eD/V_∞=0～0.03, 柱体振幅固定为A/D=0.2. 风洞烟线显示和热线测量结果表明:当 G/D位于一个有效区域内时,可有效抑制振荡柱体尾流的旋涡脱落. 该有效区的大小随着隔离板板长的增大而增大, 随着Re数和圆柱振荡频率的增大而减小.

SUPPRESSION OF VORTEX SHEDDING FROM AN OSCILLATING CIRCULAR CYLINDER BY A SPLITTER PLATE

A splitter plate was used to suppress vortex shedding from a cylinder oscillating in stream-wise direction.The splitter plate was set on the centerline of the cylinder wake,and the control parameters were the length of the splitter plate L/D and the gap between the central position of cylinder oscillation and the leading edge of the plate G/D,where D is the diameter of cylinder.The value ranges of L/D and G/D in the test were 1.0～4.0 and 0.8～4.4,respectively,and the ranges of Reynolds number and the reduced frequency of cylinder oscillation were Re = V∞D/ν = 1.01 × 104 ～ 1.69 × 104 and feD/V∞ = 0 ～ 0.03,respectively.Results of smoke wire visualization and hot-wire measurement in wind tunnel show that vortex shedding from both sides of oscillating circular cylinder can be suppressed when the splitter plate is placed in a certain region called the effective zone.The effective zone area increases with the increase of length of splitter plate and decreases with the increases of Reynolds number and the reduced frequency of cylinder oscillation.