TY - GEN
T1 - Digital image processing of an acoustically excited jet flow
AU - Chao, Yei Chin
AU - Jeng, M. S.
AU - Han, J. M.
PY - 1991
Y1 - 1991
N2 - Recent work to study excitation effects on an acoustically excited jet flow is reported. Emphasis is placed on integreated visualization and digital image processing of high resolution, sequential planar gas concentrations of some characteristics of the large scale vortical structures of the acoustically excited jet flow, such as multi-eddy merging, vortex braids formation, eddy evolution and entrainment processes, jet boundary expansion, etc. The digital image processing technique employed there extends our previous work (Chao, et. al. 1990) for optimal threshold filtering of the background noise and in situ calibration of camera and illumination distortions. A compact, low-cost, automatic frame acquisition and analysis system is developed for mean and r.m.s. planar gas concentrations and automatic jet boundary identification. Also, stroboscopic images are created for detailed sequential study of a quick-changing process using a low framing-rate camera by suitably controlling the acoustic excitation frequency and the jet flow.
AB - Recent work to study excitation effects on an acoustically excited jet flow is reported. Emphasis is placed on integreated visualization and digital image processing of high resolution, sequential planar gas concentrations of some characteristics of the large scale vortical structures of the acoustically excited jet flow, such as multi-eddy merging, vortex braids formation, eddy evolution and entrainment processes, jet boundary expansion, etc. The digital image processing technique employed there extends our previous work (Chao, et. al. 1990) for optimal threshold filtering of the background noise and in situ calibration of camera and illumination distortions. A compact, low-cost, automatic frame acquisition and analysis system is developed for mean and r.m.s. planar gas concentrations and automatic jet boundary identification. Also, stroboscopic images are created for detailed sequential study of a quick-changing process using a low framing-rate camera by suitably controlling the acoustic excitation frequency and the jet flow.
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M3 - Conference contribution
AN - SCOPUS:0026399527
SN - 0791808742
T3 - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
SP - 113
EP - 124
BT - Experimental and Numerical Flow Visualization
PB - Publ by ASME
T2 - Winter Annual Meeting of the American Society of Mechanical Engineers
Y2 - 1 December 1991 through 6 December 1991
ER -