Investigation of the applicability of conditioned particle image velocimetry under conditions close to lean blow-off

Abstract In recent years, conditioned particle image velocimetry (CPIV) has attracted much attention for flame front extraction. It is an economical and straightforward technique because the can be obtained simply from Mie-scattering images. current work, hydroxyl planar laser-induced fluorescence (OH-PLIF) measurements were taken simultaneously to study applicability of CPIV under conditions with varying equivalence ratios, reliable working range method source bias clarified quantitatively. The premixed dimethyl ether (DME)/air flames stabilized on a two-dimensional bluff body tested. found that accuracy worsens as ratio decreases. supposed related structure aerodynamics. extraction deviation in upstream region stable more significant than downstream area due intensified interaction between shear layer near body. However, approaching lean blow-off (LBO), part smaller area, which “back-support” hot recirculation zone (RZ). addition, difference results by OH-PLIF usually preheat concave-wrinkled location filled CH 2 O radicals, especially close LBO, used estimate spatial distribution O. Graphical