Flame features and oscillation characteristics in near-blowout swirl-stabilized flames using high-speed OH-PLIF and mode decomposition methods

• DOI: 10.1016/j.cja.2022.05.009
• Publication Date: 2022-05-26T16:36:59Z
• Authors: Zhen CAO; Xin YU; Jiangbo PENG; Bin HU; Zhonghao WANG; Yang YU; Long GAO; Minghong HAN; Xun YUAN; Guohua WU
• Keywords: Oscillation (cell signaling); Dynamic Mode Decomposition

Flame features and dynamics are important to the explanation prediction of a lean blowout (LBO) phenomenon. In this paper, recognition near-LBO flame oscillation characterization methods were proposed based on spectroscopic images. High-speed planar laser-induced fluorescence measurements OH used capture unique dynamic such as local extinction reignition feature entrained reactant pockets. The Zernike moment demonstrated good performance in stability conditions, though geometric had more advantages characterize frequency characteristics. Low-frequency oscillations, especially at obvious self-excited around 200 Hz, found when approaching an LBO condition, which can be expected novel characteristic parameter flameout limit. Proper orthogonal decomposition (POD) mode (DMD) conduct analysis flames. POD modes spectra showed characteristics stable flames, basically line with those heat-release frequency. primary that radial vibration dominated flame, while rotation was exist flame. Analysis modal shedding agminated pockets responsible for generating oscillations.