Drag Reduction Technique of Cylinder and Mechanism Research
Drag Reduction Technique of Cylinder and Mechanism Research
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发表时间：
2001
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影响因子：
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通讯作者：
T. Guang;Li Qiu
中科院分区：
文献类型：
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作者：
T. Guang;Li Qiu
利用氢气泡流动显示技术研究了多缝空心圆柱绕流及其减阻机理。实验包括不同开口数、开口排列方式、不同攻角的圆柱体。减阻的主要判据是缝隙是否改变了空心圆柱的尾迹。实验结果表明，当分裂攻击在|α|当攻角≤60°时，圆柱具有减阻特性，最佳攻角为20°。在这种情况下，在下游分裂中可以看到二维射流，这影响了尾迹流态。然而，当劈裂的攻击等于70°≤| α |≤90°时，劈裂对圆柱体的阻力几乎没有影响。
The hydrogen bubble flow visualization technique has been used to study the flow around a hollow circular cylinder with several splits and the drag reduction mechanism. The experiments cover the cylinder with different number and arrangement of splits, different angle of attack. The primary criterion of drag reduces is whether the splits change wake of the hollow cylinder. According to this criterion, the experimental result indicates when the attack of a split is in the range of |α| ≤60°, the cylinder possesses drag reduction characteristics, and the optimum angle of attack is 20°. Under this condition, a two dimensional jet flow is visible in the downstream split, which affects the wake flow pattern. However, when the attack of the split is equal to 70°≤| α |≤90°, the split can hardly affect the drag of the cylinder.