Abstract
In the present study, we used a simultaneous PIV-OH PLIF measurement to acquire the strain rate and the chemical intensity and suggested a new combustion phase diagram. This simultaneous measurement was used to analyze the flame structure and to classify the combustion regimes of the opposed impinging jet combustor according to the change of the orifice diameters at the pre-chambers. The shear strain rates were obtained from the velocity measurement by PIV to represent flow characteristics and the OH radical intensities were obtained from OH PUF to indicate the flame characteristics. When the strain rate and OH intensity at each point of the measurement zones are plotted at the strain rate-chemical intensity diagram, the distribution of each case showed the characteristics of each flame regime. The change of combustor condition made different distribution in the combustion phase diagram. As the orifice diameter of the pre-chamber decreases, well-mixed turbulent flames are produced and the combustion phase is moved from the moderated turbulence regime to the thickened reaction regime.
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Yongjin Cho: He received his MS degree in School of Mechanical and Aerospace Engineering in 2002 from Seoul National University. His research interests are laser diagnostics such as simultaneous PIV and PLIF, bluff-body stabilized supersonic flame and turbulent flame in the opposed impinging jet combustor.
Ji-Ho Kim: He received his Ph. D degree and MS degree in School of Mechanical and Aerospace Engineering at Seoul National University in 2003 and 1998, respectively. His research interests are laser diagnostics such as simultaneous PIV and PLIF, bluff-body stabilized supersonic flame, and numerical simulation for model scramjet engine.
Taeyoung Cho: He is a master candidate in School of Mechanical and Aerospace Engineering at Seoul National University. His research interests are laser diagnostics such as simultaneous PIV and PLIF, bluff-body stabilized supersonic flame.
Insang Moon: He received MS degree from Department of Astronomy at Yonsei University in 1988 majoring in optimum orbit transfer and ME degree from Department of Aerospace Engineering in 1998 at University of Michigan and Ph. D degree from the same University in 2003 majoring in heterogeneous combustions. Currently, he is in Post Doctoral course of Seoul National University researching laser diagnostics, such as PIV and PLIF, and NOx reduction in a small combustor.
Youngbin Yoon: After MS degree in Department of Aerospace Engineering in 1987 at Seoul National University, he received Ph. D degree in Department of Aerospace Engineering in 1994 at University of Michigan. After obtaining Ph. D, he worked as a researcher in University of California, Davis. And then he joined Seoul National University and currently is an associate professor. His research interests are visualization, laser diagnostics, supersonic combustion, turbulent diffusion flames and liquid rocket injectors.
Changjin Lee: After MS degree in School of Mechanical and Aerospace Engineering in 1985 at Seoul National University, he received Ph. D degree in Department of Aeronautical & Astronautical Engineering in 1992 at University of Illinois at Urbana-Champaign. He joined as a faculty of Department of Aerospace in Konkuk University and currently is professor. His research interests are flame instability, hybrid combustion, and solid propellant combustion modeling.
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Cho, Y., Kim, J.H., Cho, T. et al. Analysis of turbulent premixed flame structure using simultaneous PIV-OH PLIF. J Vis 7, 43–54 (2004). https://doi.org/10.1007/BF03181484
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DOI: https://doi.org/10.1007/BF03181484