Simultaneous Single-Shot LIF-Imaging of OH and UHC in a Prevaporized, Partially Premixed, Swirl-Stabilized n-Heptane Flame PUBLIC ACCESS

[+] Author Affiliations
Rudolf Lachner, Daniel Theisen, Rainer Fink, Dieter Rist

Technische Universität München, Garching, Germany

Achim Schmid, Gerd Bittlinger

BMW Rolls-Royce AeroEngines, Dahlewitz, Germany

Paper No. 98-GT-560, pp. V003T06A053; 7 pages
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7864-4
  • Copyright © 1998 by ASME


The prevaporized, partially premixed, swirl-stabilized n-heptane flame in an atmospheric pressure combustor is investigated using a tuneable KrF excimer laser. Flashing the flame with a laser sheet tuned to the P2(8) line of OH (hydroxyl radical), single-shot images of the laser-induced signals are taken simultaneously with two ICCD-cameras aligned to the same measuring volume. One camera detects mainly the laser-induced fluorescence (LIF) from the 3→2 band of the OH plus signals from UHC (unburned hydrocarbons). Only broad-band emission from UHC is imaged onto the other camera. Comparing the two images, signals stemming from OH and UHC, respectively, can be distinguished. Pictures, taken in various planes along the main flow direction, reveal highly turbulent structures in the flame. High fluorescence signals from OH can obviously be found both in filament-like flame fronts lying between fresh combustible mixtures and hot combustion products as well as in broadened reaction regions.

Copyright © 1998 by ASME
Topics: Flames , Imaging , Heptane
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