Two-dimensional distributions of temperature and soot volume fraction inversed from visible flame images

Abstract

The paper presents the inversion of two-dimensional (2-D) distributions of temperature and soot volume fraction from visible flame images. Experimental investigation was conducted in an axisymmetric, co-flow, ethylene/air laminar diffusion flame. A color digital camera was used to capture the flame image in visible spectrum. With consideration of the broad response spectrum of R, G, and B bands of the camera, the directional emissive power of R and G bands were calibrated and used to reconstruct 2-D distributions of temperature and soot volume fraction in the flame. The profiles of temperature and soot volume fraction reconstructed in this paper are both in good agreement with those obtained by multi-wavelength emission technique. The preliminary results showed that this technique is reliable and effective to diagnose combustion processes of sooting flames.