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Spectroscopic Examination and Analysis of Unconfined Swirling Flames
Ashwani Gupta,Sean Archer,Kuniyuki Kitagawa 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
Spectroscopic techniques have been used to examine the dynamic behavior of unconfined swirling flows and flames under fuel-lean combustion conditions. Specific spectroscopic diagnostics used include 3-D stereo particle image velocimetry (PIV) for the flow field, optical emission spectroscopy for CH, OH and C2 chemiluminescence, and infrared thermometry for the temperature. The effect of the radial distribution of the combustion air swirl is examined under burning and non-burning conditions in an experimental double concentric swirl burner that simulates one swirl cup of a practical gas turbine combustor using propane as the fuel. Results show the roles of the co- and the counter-swirl distributions in a burner on the flow structure, both with and without combustion. Both the swirl distribution and combustion significantly influence the flow field, as well as the spatial distributions of CH, OH, C2, and the thermal field in flames. Combustion causes a significant increase in the velocity magnitudes and in the entrained mass flow rate for the co-swirl distribution.0