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Cinematographic imaging of hydroxyl radicals in turbulent flames by planar laser-induced fluorescence up to 5 kHz repetition rate

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Abstract

Temporally resolved measurements of transient phenomena in turbulent flames, such as extinction, ignition or flashback, require cinematographic sampling of two-dimensional scalar fields. Hereby, repetition rates must exceed typical flame-inherent frequencies. The high sensitivity planar laser-induced fluorescence (PLIF) has already proved to be a practical method for scalar imaging. The present study demonstrates the feasibility of generating tuneable narrowband radiation in the ultraviolet (UV) spectral range at repetition rates up to 5 kHz. Pulse energies were sufficiently high to electronically excite hydroxyl radicals (OH) produced in a partially-premixed turbulent opposed jet (TOJ) flame. Red-shifted fluorescence was detected two-dimensionally by means of an image-intensified CMOS camera. Sequences comprising up to 4000 frames per run were recorded. Besides statistically stationary conditions, extinction of a turbulent flame due to small Damköhler numbers is presented showing the potential of the technique.

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Authors and Affiliations

  1. FG Energie- und Kraftwerkstechnik, TU Darmstadt, Petersenstraße 30, 64287, Darmstadt, Germany

    C. Kittler & A. Dreizler

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  1. C. Kittler
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  2. A. Dreizler
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Correspondence to A. Dreizler.

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PACS

42.62.Fi; 33.50.Dq; 06.60.Jn

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Kittler, C., Dreizler, A. Cinematographic imaging of hydroxyl radicals in turbulent flames by planar laser-induced fluorescence up to 5 kHz repetition rate. Appl. Phys. B 89, 163–166 (2007). https://doi.org/10.1007/s00340-007-2803-7

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  • DOI: https://doi.org/10.1007/s00340-007-2803-7

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