Instantaneous temperature visualization of a turbulent flame using multidirectional interferometer

Junta Doi; Seishiro Sato

doi:10.1117/12.583299

17 March 2005 Instantaneous temperature visualization of a turbulent flame using multidirectional interferometer

Junta Doi, Seishiro Sato

Proceedings Volume 5580, 26th International Congress on High-Speed Photography and Photonics; (2005) https://doi.org/10.1117/12.583299
Event: 26th International Congress on High-Speed Photography and Photonics, 2004, Alexandria, Virginia, United States

Abstract

We have reconstructed a three-dimensional instantaneous temperature distribution inside a turbulent flame of a propane-air premixed burner using multidirectional holographic interferograms and visualized by constructing a geometric model of the three-dimensional isothermal surfaces. To reconstruct a three-dimensional asymmetric temperature field, the interference fringe data were acquired using an eight-directional Twyman-Green interferometer, over a full range of viewing angles, around the object flame, and all data are simultaneously acquired. A ruby laser, having a beam with a 20-30 ns pulse width, was used to obtain clear fringe patterns for this type of turbulent phenomena. The temperature distribution was reconstructed from the refractive index distribution, obtained from the fringe patterns, based on a computed tomography technique of a convolution reconstruction algorithm. Isothermal profiles were calculated in horizontal cross sections from the temperature data. All of the multiple isothermal contour lines in each horizontal section were approximated with polygons and then stacked up vertically to form polyhedra of the solid model format, having side facets of corresponding isothermal values. Computer graphics of the solid models, not only of the initial isothermal solids, but also of the solids resulting from multiple Boolean operations on them, were used to show the distribution in detail. This development will be of help in studying the local structure of the instantaneous turbulent flame and in integrating the experimental modeling with the numerical simulation.

Citation Download Citation

Junta Doi and Seishiro Sato "Instantaneous temperature visualization of a turbulent flame using multidirectional interferometer", Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); https://doi.org/10.1117/12.583299

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