3D-CT Measurement of Premixed Flames Using a Multi-directional Quantitative Schlieren Optical System (Solo-measurement of Density and Combined-measurement of Density and Light-emission Distributions)

A non-scanning 3D-CT technique using a multi-directional quantitative schlieren system, is proposed to obtain instantaneous density distributions of unsteady premixed flames. This “schlieren 3D-CT” is based on (i)simultaneous acquisition of schlieren images taken from numerous directions, (ii) reproduction of projection images from the schlieren images, and (iii) 3D-CT reconstruction of the projections by an appropriate algorithm. In this paper, 3D-CT reconstruction of an axisymmetric steady flame is made with a single-directional quantitative schlieren system. Also combined reconstruction of density and light-emission-intensity distributions of non- axisymmetric steady flame is made. These investigations are conducted as a preliminary research relevant to a massive system having 20 schlieren systems, suitable for the observation of high speed turbulent flames.