TY - GEN
T1 - Quantitative visualization of the structure of swirl burner flows
AU - Ho, Wu Chi
AU - Chen, Chian Hsian
AU - Yang, Shyh Ching
AU - Chao, Yei Chin
N1 - Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 1991
Y1 - 1991
N2 - The quantitative visualization of swirl burner flows is performed in the present study. A two-dimensional digital laser sheet image processing technique is employed to enhance the qualitative flow visualization images and to obtain quantitative results of the flows. The calibration of the errors due to the distortion of the camera and the nonuniformity of the laser sheet is made. The unsteady characteristics of the jet mixing behavior in the swirling flow can clearly be analyzed from the sequential instantaneous images. In the central fuel jet in weak swirling flow cases, the CTRZ can not be generated. However, because of the effect of the centrifugal force, the jet spread angle in swirling flow is larger than that in nonswirling flow. It is found in the central fuel jet in strong swirling flow cases that the presence of the stagnation region of the recirculation zone has the dominant effect on the jet mixing in the swirling flow. As the axial velocity ratio of the central jet over the annular air is equal to 4.75, the vortex breakdown of the swirling flow will not happen because of the large momentum of the central jet. Better mixing between the jet(s) and the swirling flow can be obtained in the annular fuel jet cases as compared with the central fuel jet cases.
AB - The quantitative visualization of swirl burner flows is performed in the present study. A two-dimensional digital laser sheet image processing technique is employed to enhance the qualitative flow visualization images and to obtain quantitative results of the flows. The calibration of the errors due to the distortion of the camera and the nonuniformity of the laser sheet is made. The unsteady characteristics of the jet mixing behavior in the swirling flow can clearly be analyzed from the sequential instantaneous images. In the central fuel jet in weak swirling flow cases, the CTRZ can not be generated. However, because of the effect of the centrifugal force, the jet spread angle in swirling flow is larger than that in nonswirling flow. It is found in the central fuel jet in strong swirling flow cases that the presence of the stagnation region of the recirculation zone has the dominant effect on the jet mixing in the swirling flow. As the axial velocity ratio of the central jet over the annular air is equal to 4.75, the vortex breakdown of the swirling flow will not happen because of the large momentum of the central jet. Better mixing between the jet(s) and the swirling flow can be obtained in the annular fuel jet cases as compared with the central fuel jet cases.
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M3 - Conference contribution
AN - SCOPUS:0026404452
SN - 0791808742
T3 - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
SP - 149
EP - 154
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 -