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Published June 2016 | public
Journal Article

High-speed OH-PLIF imaging of deflagration-to-detonation transition in H_2–air mixtures

Abstract

Planar laser-induced fluorescence (PLIF) is considered a standard experimental technique in combustion diagnostics. However, it has only been occasionally applied to explosion experiments with fast combustion regimes. It has been shown that single-shot OH-PLIF with high pulse energies yields clear fluorescence images of fast deflagrations and also detonations. This paper presents the first application of high-speed OH-PLIF at 20 kHz repetition rate to a deflagration-to-detonation transition experiment. Hydrogen–air mixtures at initial atmospheric pressure and ambient temperature are investigated. Satisfactory results are obtained for flame speeds up to about 500 m/s. Flame instabilities and turbulence–flame interactions are observed. Two factors limit the applicability of HS OH-PLIF toward higher flame speeds: excessive flame luminescence masking the HS OH-PLIF signal and strong absorption of laser light by the flame. The variation in OH-PLIF signal-to-background ratio across a DDT process is studied using a 1D laminar premixed flame simulation extended by spectroscopic models.

Additional Information

© 2016 Springer-Verlag Berlin Heidelberg. Received: 9 September 2015; Revised: 17 May 2016; Accepted: 21 May 2016; Published online: 2 June 2016. The presented work is funded by the German Federal Ministry of Economic Affairs and Energy (BMWi) on the basis of a decision by the German Bundestag (Project No. 1501425) and by the German Research Foundation (DFG) in the framework of Sonderforschungsbereich Transregio 40, which is gratefully acknowledged.

Additional details

Created:
August 20, 2023
Modified:
October 20, 2023