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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Three-Dimensional Chemiluminescence Imaging of Unforced and Forced Swirl-Stabilized Flames in a Lean Premixed Multi-Nozzle Can Combustor

[+] Author and Article Information
Janith Samarasinghe

e-mail: rjs5309@psu.edu

Stephen Peluso

e-mail: sjp249@psu.edu

Michael Szedlmayer

e-mail: mts244@psu.edu

Alexander De Rosa

e-mail: ajd5455@psu.edu

Bryan Quay

e-mail: bdq100@psu.edu

Domenic Santavicca

e-mail: das8@psu.edu
Center for Advanced Power Generation,
The Pennsylvania State University,
University Park, PA 16802

Contributed by the Combustion and Fuels Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received June 27, 2013; final manuscript received July 5, 2013; published online September 6, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(10), 101503 (Sep 06, 2013) (7 pages) Paper No: GTP-13-1194; doi: 10.1115/1.4024987 History: Received June 27, 2013; Revised July 05, 2013

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.

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Figures

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Fig. 1

Schematic of multi-nozzle combustor

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Fig. 2

Color photographs of the five-nozzle flame viewed from the side (a) and from the exhaust looking down into the combustor (b)

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Fig. 3

Schematic drawing of multi-angle imaging setup

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Fig. 4

Unforced flame projection images from two different viewing angles 0 deg (a) and 44 deg (b)

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Fig. 5

Linear color bar for all chemiluminescence images

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Fig. 6

(a) Projection images showing a horizontal bin at location “z” and (b) array of horizontal bins at location z from 4 N projection images

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Fig. 7

Two-dimensional slice oriented perpendicular to the combustor axis obtained from inverse Radon transform

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Fig. 8

Visualization of the three-dimensional reconstruction of the five-nozzle flame

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Fig. 9

Vertical slices at the indicated locations: (a), (b), (c), (d), and (e)

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Fig. 10

Horizontal slices at the indicated locations: (a), (b), (c), and (d)

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Fig. 11

Comparison of reconstructed (a) and measured (b) downstream projection images

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Fig. 12

Two-dimensional horizontal (a) and vertical (b) slices of the three-dimensional reconstruction obtained using 46 projection images spaced every 2 deg

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Fig. 13

Horizontal slices of 5% forced multi-nozzle flames at 100 Hz

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Fig. 14

Vertical slices of 5% forced multi-nozzle flames at 100 Hz

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