Abstract
To improve the understanding of flame propagation through a nonpremixed vortex ring, the characteristics of fuel concentration in a vortex ring have been investigated experimentally. The vortex ring was generated by the ejection of propane with a single stroke motion of a speaker. Planar laser-induced fluorescence (PLIF) technique was adopted by seeding acetone as a tracer to fuel stream, in which the PLIF signal intensity is directly proportional to the concentration of acetone. This technique provides non-intrusive and instantaneous measurement of concentration field. Results showed that fuel concentration and its gradient decreased with the evolution of a vortex ring. When a nonpremixed flame propagated through a vortex ring, the flame location coincides with the inner most spiral mixing layer of fuel and air in a vortex ring.
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Ho Jin Choi: He is a Ph.D. candidate in the School of Mechanical and Aerospace Engineering at Seoul National University, Seoul, Korea. He received his M.S. degree in 1998 from the Department of Mechanical Engineering, Seoul National University. His research interests include flame propagation, laser diagnostics and flow visualization.
Young-Sung Ko: He is a senior-researcher in the Division of Propulsion System Research and Development at Korea Aerospace Research Institute. He received his Ph.D. degree in the Department of Mechanical Engineering, Seoul National University in 1998. His research interests include flame propagation, laser diagnostics, laser-ignition, gasturbine combustor and liquid rocket engine.
Suk Ho Chung: He received his B.S. degree in Mechanical Engineering in 1976 from Seoul National University, and his Ph.D. degree in Mechanical Engineering in 1983 from Northwestern University. He is a professor since 1984 in the School of Mechanical and Aerospace Engineering, Seoul National University. His research interests cover combustion, pollutant formation and laser diagnostics.
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Choi, H.J., Ko, Y.S. & Chung, S.H. Visualization of concentration field in a vortex ring using acetone PLIF. J Vis 5, 145–152 (2002). https://doi.org/10.1007/BF03182423
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DOI: https://doi.org/10.1007/BF03182423