Tomographic reconstruction of 2D-OH*-chemiluminescence distributions in turbulent diffusion flames

作者：Anikin N B; Suntz R^*; Bockhorn H

来源：Applied Physics B: Lasers and Optics , 2012, 107(3): 591-602.

DOI：10.1007/s00340-012-5003-z

A recently developed fast tomographic reconstruction device (Anikin et al. in Appl. Phys. B 100:675, 2010) has been applied to detect 2-D chemiluminescence distributions of OHau in reaction zones of a near laminar and a turbulent diffusion flame. A series of single-shot experiments has been carried out in both flames offering cold gas flow velocities of 0.43 m/s and 4 m/s and flame diameters up to 60 mm, respectively. %26lt;br%26gt;The emission of OHau-chemiluminescence originating from the reaction zones of the flame fronts was registered by ten Kepler-telescopes surrounding the object under investigation at different pre-defined angles. The signals emerging from each telescope are collected by a fiber cable consisting of 90 single fibers arranged side by side in a single row, respectively. The signals originating from the ten cables/10x90=900 fibers represent the corresponding Radon transforms. These signals are imaged by a relay-optics onto the photocathode of a single image intensified CCD-camera. The output data of the camera are used for the reconstructions of the 2D-distributions of OHau-emission using a numerical procedure solving the inverse problem of tomography (Anikin et al. in Appl. Phys. B 100:675, 2010, and references therein). From the experimental results it is shown that the reconstructions obtained at exposure times down to 200 mu s reproduce fine structures of the flames with a spatial resolution of similar to 1 mm. Therefore, the method is a useful tool for the detailed investigation of turbulent combustion.

• 出版日期2012-6