FLEET velocimetry for combustion and flow diagnostics

Applied Optics
Nicholas J DeLucaJames R Gord

Abstract

We report the use of femtosecond laser electronic excitation tagging (FLEET) for velocimetry at a 100-kHz imaging rate. Sequential, single-shot, quantitative velocity profiles of an underexpanded supersonic nitrogen jet were captured at a 100-kHz rate. The signal and lifetime characteristics of the FLEET emission were investigated in a methane flame above a Hencken burner at varying equivalence ratios, and room temperature gas mixtures involving air, methane, and nitrogen. In the post-flame region of the Hencken burner, the emission lifetime was measured as two orders of magnitude lower than lab air conditions. Increasing the equivalence ratio above 1.1 leads to a change in behavior, with a doubled lifetime. By measuring the emission in a cold methane flow, a short-lived signal was measured that decayed after the first microsecond. As a proof of concept for velocimetry in a reacting environment, the exhaust of a pulsed detonator was measured by FLEET. Quantitative velocity information was obtained that corresponded to a maximum centerline velocity of 1800 m/s for the detonation wave. Extension of FLEET to larger scale, complex flow environments is now a viable option.

References

Nov 23, 2007·Optics Letters·N DamJ J Meulen
May 15, 1996·Optics Letters·R W PitzJ Segall
Sep 29, 2011·Applied Optics·James B MichaelRichard B Miles
Jul 15, 2015·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Richard B MilesArthur Dogariu

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Citations

Jan 1, 2018·Applied Physics. B, Lasers and Optics·Jordi EstevadeordalSukesh Roy
Mar 11, 2021·Applied Optics·Stephen W GribS Alexander Schumaker
Jun 26, 2019·Journal of Applied Physics·Christopher J PetersRichard B Miles

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