The test showed that there are Karman vortex street behind cylinder ,but the rule of shedding frenquency as strouhal number is defferent compared with that the cylinder is put into outflow.

• 实验结果显示,在平面叶栅风洞内的圆柱体尾流中有类似在外流中的卡门涡街脱落现象,但所对应的斯特劳哈数比外流稍小。