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http://dx.doi.org/10.6108/KSPE.2022.26.6.062

Flow Symmetry Breaking Effect According to Instability in Annular Combustor Part.I : Characteristics of Nozzle Arrangement  

Huido Lee (School of Mechanical and Aerospace Engineering/Center for Aerospace Eng. Research, Sunchon National University)
Keeman Lee (School of Mechanical and Aerospace Engineering/Center for Aerospace Eng. Research, Sunchon National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.26, no.6, 2022 , pp. 62-73 More about this Journal
Abstract
This research proposes a method to control combustion instability in a gas turbine combustor having an annular combustor form and compares the effect of flow symmetric braking through nozzle arrangement and the corresponding change in equivalent ratio. To this end, the symmetry breaking effect was confirmed through mode analysis of FFT, Time signal, and phase trajectory. In addition, the unstable area and the stable area were identified through mode analysis, and this was shown on the contour map. The present research shows that instability occurs when the equivalent ratio and the arrangement of the nozzles are symmetry or when the nozzles are continuously arranged, but if the arrangement and equivalent ratio are not symmetry, the combustion instability decreases dramatically even if the difference in the equivalent ratio is small.
Keywords
Annular Combustor; Thermo-acoustic Instability; Symmetry Breaking; Longitudinal Instability;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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