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A triple-exposure color PIV technique for pressure reconstruction

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Abstract

The study developed a triple-exposure color particle image velocimetry (TE-CPIV) technique associated with pressure reconstruction, and validated its feasibility. A light source with the three primary colors of red, green, and blue (R, G, and B) is produced in a time sequence by a liquid crystal display (LCD) projector. Particle images at three different instants under the color illuminations are captured in one snapshot using a color digital single-lens reflex (SLR) camera with a complementary metal-oxide semiconductor (CMOS) sensor. A contamination correction algorithm based on a specific calibration is performed on the different color layers (R layer, G layer, and B layer) of the raw color image to reduce the contaminated intensity of each color illumination on the other two color layers. The corrected intensity generates three new color layers, from which a standard cross-correlation process in the classical PIV method is used to obtain two velocity fields. Eventually, an instantaneous pressure field is reconstructed from the two velocity fields. The feasibility of TE-CPIV was tested by two experiments with a solid body rotation flow and a cylinder wake flow. The results show acceptable accuracy and robustness of the new technique. The idea of the TE-CPIV is believed to provide a simple and effective way of estimating a pressure field with low cost and high convenience.

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Authors and Affiliations

  1. Key Laboratory of Fluid Mechanics, Ministry of Education, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    ZhongYi Wang, Qi Gao & JinJun Wang

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  1. ZhongYi Wang
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  2. Qi Gao
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  3. JinJun Wang
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Correspondence to Qi Gao.

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Wang, Z., Gao, Q. & Wang, J. A triple-exposure color PIV technique for pressure reconstruction. Sci. China Technol. Sci. 60, 1–15 (2017). https://doi.org/10.1007/s11431-016-0270-x

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  • DOI: https://doi.org/10.1007/s11431-016-0270-x

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