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A dual-camera cinematographic PIV measurement system at kilohertz frame rate for high-speed, unsteady flows

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Abstract

A digital dual-camera cinematographic particle image velocimetry (CPIV) system has been developed to provide time-resolved, high resolution flow measurements in high-Reynolds number, turbulent flows. Two high-speed CMOS cameras were optically combined to acquire double-pulsed CPIV images at kilohertz frame rates. Bias and random errors due to camera misalignment, camera vibration, and lens aberration were corrected or estimated. Systematic errors due to the camera misalignment were reduced to less than 2 pixels throughout the image plane using mechanical alignment, resulting in 3.1% positional uncertainty of velocity measurements. Frame-to-frame uncertainties caused by mechanical vibration were eliminated with the aid of digital image calibration and frame-to-frame camera registration. This dual-camera CPIV system is capable of resolving high speed, unsteady flows with high temporal and spatial resolutions. It also allows time intervals between the two exposures down to 4 μs, enabling the measurements of speed flows 5–10 times higher than possible with frame-straddling using similar cameras. A turbulent shallow cavity was then chosen as the experimental object investigated by this dual-camera CPIV technique.

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Acknowledgments

This work was partially supported by the National Science Foundation under project number NSF-CTM-02-03140.

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Correspondence to Shiyao Bian.

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Bian, S., Ceccio, S.L. & Driscoll, J.F. A dual-camera cinematographic PIV measurement system at kilohertz frame rate for high-speed, unsteady flows. Exp Fluids 48, 487–495 (2010). https://doi.org/10.1007/s00348-009-0753-z

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  • DOI: https://doi.org/10.1007/s00348-009-0753-z

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