Three-dimensional chemiluminescence imaging of unforced and forced swirl-stabilized flames in a lean premixed multi-nozzle can combustor

Janith Samarasinghe, Stephen Peluso, Michael Szedlmayer, Alexander De Rosa, Bryan Quay, Domenic Santavicca

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    46 Scopus citations

    Abstract

    A tomographic image reconstruction technique has been developed to measure the 3D distribution of CH* chemiluminescence of unforced and forced turbulent premixed flames. Measurements are obtained in a lean premixed, swirl-stabilized multi-nozzle can combustor. Line-of-sight images are acquired at equally spaced angle increments using a single intensified charge-coupled device camera. 3D images of the flames are reconstructed by applying a filtered back projection algorithm to the acquired line-of-sight images. Methods of viewing 3D images to characterize the structure, dynamics, interaction and spatial differences of multi-nozzle flames are presented. Accuracy of the reconstruction technique is demonstrated by comparing reconstructed line-of-sight images to measured line-of-sight downstream-view images of unforced flames. The effect of the number of acquired projection images on the quality of the reconstruction is assessed. The reconstructed 3D images of the unforced multi-nozzle flames show the structure of individual flames as well as the interaction regions between flames. Forced flame images are obtained by phase-synchronizing the camera to the forcing cycle. The resulting 3D reconstructions of forced flames reveal the spatial and temporal response of the multi-nozzle flame structure to imposed velocity fluctuations, information which is essential to identifying the underlying mechanisms responsible for this behavior.

    Original languageEnglish (US)
    Article number101503
    JournalJournal of Engineering for Gas Turbines and Power
    Volume135
    Issue number10
    DOIs
    StatePublished - Nov 28 2013

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Fuel Technology
    • Aerospace Engineering
    • Energy Engineering and Power Technology
    • Mechanical Engineering

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