抄録
In previous works, 3D-CT (Three Dimensional Computer Tomography) reconstruction of instantaneous 3D light emission distributions of turbulent premixed flames have been successfully obtained by a simultaneous photography with a custom-made 40-lens camera. Furthermore time-series 3D-CT distributions have been reconstructed by using a single high speed camera combined with a multi-mirror optical system. The techniques, in which light emission from target was captured, however, had an essential disadvantage for high speed detection of flames in terms of the shortage of the quantity of light, resulting in blurring image. In present study, in order to provide a suitable technique for 3D observation of high speed turbulent flames, non-scanning 3D-CT technique using a multi-directional quantitative schlieren system with flash light source, is proposed for instantaneous density distribution of unsteady premixed flames. This "Schlieren 3D-CT" is based on (i)simultaneous acquisition of flash-light schlieren images taken from numerous directions, and (ii) 3D-CT reconstruction of the images by an appropriate CT algorithm. In this paper, with custom-made 20 directional schlieren camera, instantaneous density distributions of a high-speed turbulent flame, which can be used as an industrial furnace burner flame, have been CT-reconstructed.
