High-Speed Digital-Particle-Image-Velocimetry Study of Vortex Breakdown

High-Speed Digital-Particle-Image-Velocimetry Study of Vortex Breakdown
复制标题

涡破裂的高速数字粒子图像测速研究

DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
D. Telionis
D. Telionis
中科院分区：
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文献类型：
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作者：
S. Klute;P. Vlachos;D. Telionis

文献摘要

被引文献

相似文献

利用时间分辨数字粒子图像测速技术对三角翼前缘涡轴流场进行了沿着流场的研究。500 Hz的采样频率允许详细记录场的时间演变。螺旋涡破裂研究的速度场和涡量场沿沿着一个平面通过涡轴。涡量的意义是逆转的涡破裂的发病，与早期的实验和数值结果。现在提供的证据表明，早期观察到的周期性振荡归因于螺旋涡破裂的旋转和膨胀螺旋。
Time-resolved digital particle image velocimetry is employed to investigate the flowfield along a plane passing through the axis of a delta-wing leading-edge vortex. A sampling frequency of 500 Hz allows the detailed documentation of the temporal evolution of the field. Spiral vortex breakdown is studied in terms of velocity and vorticity fields along a plane through the vortex axis. The sense of vorticity is reversed at the onset of vortex breakdown, in agreement with earlier experimental and numerical results. Evidence is now provided that periodic oscillations observed earlier are attributed to a rotating and expanding spiral of the helical vortex breakdown.