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Proceedings Paper

Optical combustion diagnostics applied to a flameproof enclosure model
Author(s): Michael Beyer
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Paper Abstract

The propagation of an explosion caused by an error can be successfully prevented by flameproof enclosures. This paper describes investigations applying different nonintrusive diagnostic methods to the combustion process in a turbulent jet emerging from the joint gap of a flameproof enclosure model. Experiments are carried out using a tuneable excimer laser operated either with ArF (193 nm) or KrF (248 nm). Rayleigh scattering is used to determine temperature distribution in the free jet, and laser-induced fluorescence of OH is used to observe the combustion and flow processes. The enclosure consists of two explosion vessels which are connected via a nozzle of variable dimensions. H2/O2/N2 mixtures with a stoichiometric H2/O2 ratio are investigated. The position of the ignition source in the smaller vessel is made use of to vary the explosion pressure prevailing in the enclosure at the moment when the flame front enters the joint. Prevention of an outside explosion depends on both the nozzle dimensions and the upstream explosion pressure at the moment when the flame front enters the joint. In the range of application of flameproof enclosures, the outside ignition takes place as a result of a flame quenching process in the nozzle and subsequent re- ignition in the turbulent mixing zone of fresh and exhaust gas that has escaped from the joint gap into the environment.

Paper Details

Date Published: 20 September 1995
PDF: 10 pages
Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); doi: 10.1117/12.221009
Show Author Affiliations
Michael Beyer, Physikalisch-Technische Bundesanstalt Braunschweig (Germany)

Published in SPIE Proceedings Vol. 2506:
Air Pollution and Visibility Measurements
Peter Fabian; Volker Klein; Maurus Tacke; Konradin Weber; Christian Werner, Editor(s)

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