Abstract
Simultaneous multi-plane measurement of planar laser induced fluorescence (PLIF) and stereoscopic particle image velocimetry (PIV) to investigate three-dimensional structures of turbulent premixed flames is introduced in this manuscript. Wavelength-based dualplane stereoscopic PIV, which can provide nine components of velocity gradients, was developed and combined with dual-plane CH PLIF and single-plane OH PLIF. The simultaneous measurement was applied to methane-air turbulent premixed flames in the swirl-stabilized combustor. three-dimensional flame structures including the spire structure which has been shown by the previous direct numerical simulation (DNS) of turbulent premixed flame was clarified. Magnitude of strain rate, which is evaluated from nine velocity gradients, shows high value in unburnt region except for the region engulfed by burnt gas. Moreover, quad-plane PLIF which has been developed to investigate threedimensional flame structure in more detail is introduced in this manuscript.
