Application No./Patent No.: 2017107668703 Application date: August 30, 2017.
Inventor/Designer: Cao Yu, Ke Yirui, Xue Wei, Sun Ke, Liu Wenwen, Zhu Dehua, Zhang Jian, Sun Bingtao.
The invention provides a method for detecting the space-time evolution process of wall turbulence based on fluorescent fiber tracing, which comprises the following steps: (1) preparing a test sample; N micro through holes are distributed on the surface of the test sample; (2) the fluorescent fiber filament of the tracer marker penetrates into the micropore from the back to the front of the test sample, and the fluorescent fiber does not outcrop on the front; (3) A flow field is applied to the front of the test sample, and a light source system is adopted to continuously irradiate the flow field area to be detected, and at the same time, a flow field image acquisition system is used to record the instantaneous shape of the fluorescent filament in a high-precision time sequence; (4) Image processing and calculation fitting are carried out on the instantaneous shape of fluorescent filament, and the three-dimensional dynamic structure of the near-wall flow field and its spatio-temporal evolution process information are reconstructed and visualized. The method not only has the characteristics of instantaneous, simultaneous and multipoint measurement by PIV technology, but also has the outstanding advantages of simultaneous measurement of kinematic and dynamic characteristics, high signal-to-noise ratio, simple device, low cost and high reliability.
