碳氢湍流火焰中多反应区成像测量技术研究
Detection and imaging of multi-reaction zones is an essential tool for understanding the detailed structureof complicated flames. In this work a combined 4-camera technique is presented for multi-reaction zonesimaging. The technique combines highly advanced laser-based diagnostics tools, namely Rayleigh scattering,laser-induced predissociation fluorescence (LIPF) of OH, LIF of PAH, and LIF of formaldehyde (CH2O). Theapplication of this combined technique in turbulent non-homogeneous hydrocarbon flames is quite new. Thetechnique shows its ability to detect simultaneously rich, lean and diffusion reaction zones. The 3 reactionzones can be spatially resolved, providing essential information about their interaction and overall flamestability. Therefore, the detection and study of triple flame structures in non-homogeneous turbulent flamesbecomes possible. An example of a triple flame structure in a turbulent lifted non-premixed methane flameis presented. The present work proves that the developed technique is a powerful tool for multi-reactionzone measurements in turbulent and laminar flames.