Time-resolved study of mixing and reaction in an aero-engine model combustor at increased pressure
نویسندگان
چکیده
In this study, we experimentally investigate large-scale vortex structures, fuel-air mixing and reaction processes, which occur in a partially premixed swirl-stabilized ethylene/air flame laboratory-scale gas turbine model combustor. Time-resolved stereo-PIV, OH-PLIF, acetone/PAH-PLIF systems with repetition rate of 10 kHz are used to the behavior at 3 bar pressure an equivalence ratio Φ=1.2. For isothermal conditions, results strongly indicate that vortex-induced roll-up fuel is main driver process. reacting case, precessing core (PVC) double helical (DHV), both co-rotating swirl direction occurring simultaneously inner outer shear layer, respectively, identified by using proper orthogonal decomposition (POD) phase-averaging techniques. Acetone-PLIF measurements show exhibits motion resembles strong axial flapping frequency DHV conditions when considering measurement plane. The PVC cause regular sequence roll-up, mixture burned unburned gases, subsequent ignition mixture. pockets rich formed can eventually be oxidized OH-rich lean regions have potential prevent soot formation; however, process depends on intermittent within recirculation zone. Based additional visualization PAH-PLIF distributions, present study further reveals for first time complete formation gas, PAH GT It shown forms only certain high-PAH pockets. This indicates other factors, such as detailed composition PAHs or local temperatures, cannot resolved here, likely also play important role formation.
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ژورنال
عنوان ژورنال: Combustion and Flame
سال: 2021
ISSN: ['1556-2921', '0010-2180']
DOI: https://doi.org/10.1016/j.combustflame.2021.111474