Rayleigh Index Fields in Helically Perturbed Swirl-Stabilized Flames Using Doubly Phase Conditioned OH* Chemiluminescence Tomography

作者: B. D. Geraedts , C. M. Arndt , A. M. Steinberg

DOI: 10.1007/S10494-016-9727-4

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摘要: This paper demonstrates a method for calculating thermoacoustic energy transfer (viz. Rayleigh Index) fields in complex swirl-stabilized flames having asymmetric 3D flow structures using high-repetition-rate OH* chemiluminescence measurements. Measurements were acquired variety of perfectly premixed methane-air flames, each which contained helical velocity disturbance that was coupled with precessing vortex core (PVC). The azimuthal position the PVC and relative to viewing angle determined by tracking centoid. Tomographic reconstruction multiply-phase-conditioned mean then performed determine shape helically-perturbed heat release field at different phases over cycle. These fields, combination measured pressured signals, allowed calculation distribution. Complex patterns found, generally involved considerable periphery burner (i.e. towards outer recirculation zone). total found scale limit-cycle oscillation amplitude. provides relatively simple robust diagnostic determining combustor regions driving oscillations.

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