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ISSN Print: 1065-3090
ISSN Online: 1940-4336
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INVESTIGATION OF DUAL COLOR BEAM SCANNING (DCBS) PIV SYSTEM
ABSTRACT
The aim of the work is to develop a low-cost particle image velocimetry (PIV) system with scanning-based illumination (instead of the pulsed illumination used in the conventional PIV). Illumination consists of scanning of two different color (red and green) laser beams, with a known time difference between them, through the region of interest within the flow field. A combination of a rotating plane mirror and a stationary parabolic mirror is used to make the beam scan through the test section to illuminate the flow, and a color camera is used to capture illuminated seeded particles in the flow. The main objective of this paper was to develop a theoretical framework for the DCBS PIV system considering the spatial variation in the time interval Δt between two illuminations. Spatial variation in Δt occurs due to the nonuniform scanning speeds of laser beams. Based on the displacement field (obtained from cross-correlation of separated red and green color particle images) and the Δt distribution, the velocity field can be obtained. The developed theoretical framework is used to analyze the performance of the DCBS PIV system for different flow problems.
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