Stereoscopic Planar Image Velocimetry (SPIV) has been applied to obtain the three
components of the instantaneous velocity vectors on a vertical plane above the burner
outlet where the flames propagate. The instantaneous temperature fields have been
determined through Laser Induced Rayleigh (LIRay) scattering. Planar Laser Induced
Fluorescence (PLIF) on acetone has been used to calculate the average equivalence ratio
distributions. Instantaneous turbulent burning velocities have been extracted from SPIV
results, while flame curvature and flame thermal thickness values have been calculated
using the instantaneous temperature fields. The probability distributions of these
quantities have been compared considering the separate influence of equivalence ratio
stratification and turbulence. It has been observed that increased levels of turbulence
determine higher turbulent burning velocities and flame front wrink领. Flames
characterized by stronger fuel stratification showed higher values in turbulent burning
velocities. From the curvature analysis emerged that increased fuel concentration
gradients favour flame wrink领, especially when associated with positive small radius
of curvature. This determines an increased surface area available for reaction that
promotes a faster propagation of the flame front in the oncoming combustible mixtures. 德国LaVision PIV/PLIF粒子成像测速场仪 PLIF平面激光诱导荧光火焰燃烧检测系统 三维立体PIV
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