PIV measurements in near-wake turbulent regions

被引：4
|
作者：
Chen, Wei-Cheng [1 ]
Chang, Keh-Chin [1 ]
机构：
[1] Natl Cheng Kung Univ, Dept Aeronaut & Astronaut, 1 Univ Rd, Tainan 70101, Taiwan
来源：
MODERN PHYSICS LETTERS B | 2018年 / 32卷 / 12-13期
关键词：
PIV; hot-wire anemometry; wake; turbulent flow; OPTIMIZATION;
D O I：
10.1142/S0217984918400262
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Particle image velocimetry (PIV) is a non-intrusive optical diagnostic and must be made of the seedings (foreign particles) instead of the fluid itself. However, reliable PIV measurement of turbulence requires sufficient numbers of seeding falling in each interrogation window of image. A gray-level criterion is developed in this work to check the attainment of statistically stationary status of turbulent flow properties. It is suggested that the gray level of no less than 0.66 is used as the threshold for reliable PIV measurements in the present near-wake turbulent regions.
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页数：6
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