Evaluation of the performance of high-speed PIV compared to standard PIV in a turbulent jet |
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Authors: | M Falchi G P Romano |
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Institution: | (1) Department of Mechanics and Aeronautics, University “La Sapienza”, Via Eudossiana n° 18, 00184 Rome, Italy |
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Abstract: | In this paper, a comparison between two particle image velocimetry (PIV) systems, one based on a standard cross-correlation
charge coupled device (CCD) camera with pulsed laser and another using high-speed complementary metal oxide semiconductor
(CMOS) camera with continuous laser is performed. The objective of the paper is to point out advantages and disadvantages
of the two systems when computing large and small flow scale statistics. The comparison is performed on velocity measurements
in the near and far fields of a circular water jet: on this flow several experimental data and empirical self-similarity laws
are available for comparisons. The results show that both systems are suitable for measurements with a preference for the
standard one when investigating small-scale statistics. This result depends on the lower number of effectively independent
samples acquired by a high-speed system and on the higher noise levels of CMOS sensors in comparison to CCDs. |
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