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

The Three-Dimensional Structure of Swirl-Stabilized Flames in a Lean Premixed Multinozzle Can Combustor

[+] Author and Article Information
Janith Samarasinghe

Turbulent Combustion Lab,
The Pennsylvania State University,
University Park, PA 16802
e-mail: rjs5309@psu.edu

Stephen J. Peluso

Turbulent Combustion Lab,
The Pennsylvania State University,
University Park, PA 16802
e-mail: sjp249@psu.edu

Bryan D. Quay

Turbulent Combustion Lab,
The Pennsylvania State University,
University Park, PA 16802
e-mail: bdq100@psu.edu

Domenic A. Santavicca

Turbulent Combustion Lab,
The Pennsylvania State University,
University Park, PA 16802
e-mail: das8@psu.edu

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 2, 2015; final manuscript received August 19, 2015; published online September 22, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(3), 031502 (Sep 22, 2015) (10 pages) Paper No: GTP-15-1230; doi: 10.1115/1.4031439 History: Received July 02, 2015; Revised August 19, 2015

Flame structure can have a significant effect on a combustor's static stability (resistance to blowoff) and dynamic stability (combustion instability) and therefore is an important aspect of the combustion process that must be taken into account in the design of gas turbine combustors. While the relationship between flame structure and flame stability has been studied extensively in single-nozzle combustors, relatively few studies have been conducted in multinozzle combustor configurations typical of actual gas turbine combustion systems. In this paper, a chemiluminescence-based tomographic reconstruction technique is used to obtain three-dimensional images of the flame structure in a laboratory-scale five-nozzle can combustor. Analysis of the 3D images reveals features of the complex, three-dimensional structure of this multinozzle flame. Effects of interacting swirling flows, flame–flame interactions, and flame–wall interactions on the flame structure are also discussed.

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Figures

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Fig. 1

Key fluid dynamic features of an annular swirl flow: (A) outer recirculation zone, (B) inner recirculation zone, (C) reactant jet, (D) inner shear layer, (E) outer shear layer, and (F) centerbody wake. Modified from Ref. [5].

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Fig. 2

(a) Schematics of V- and M-flames and (b) V- and M-flames observed in the multinozzle combustor

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Fig. 3

Schematics and photographs of the multinozzle combustor

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Fig. 4

Schematic of multi-angle imaging setup

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Fig. 5

Projection images of unforced multinozzle flame obtained from different viewing angles around the combustor

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Fig. 6

Pseudo color scale used for all chemiluminescence images

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Fig. 7

Two-dimensional horizontal and vertical slices of the reconstructed three-dimensional multinozzle flame image

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Fig. 8

Enlarged view of vertical slice through the center of the multinozzle combustor

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Fig. 9

Horizontal slices at incremental axial distances from the dump plate

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Fig. 10

Angle of the interaction region in the direction of swirl

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Fig. 11

Comparison between horizontal chemiluminescence image slices of the multinozzle flame and LDV data from a nine-nozzle LDI combustor [24]

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Fig. 12

Isolating the middle flame and division into vertical two-dimensional slices around the circumference

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Fig. 13

Plots of (a) flame root angle and (b) chemiluminescence intensity of vertical slices around the circumference of the middle flame as a function of rotation angle

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Fig. 14

Isolating a single outer flame and division into vertical two-dimensional slices around the circumference

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Fig. 15

(a) Dimensions used to calculate confinement ratio and (b) variation of confinement ratio (Cr) with rotation angle (θrot)

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Fig. 16

(a) Flame brush of a vertical flame slice, (b) calculation of extent of mean flame position and, (c) flame brush with mean flame position overlaid

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Fig. 17

Two-dimensional vertical slices of the outer half of an outer flame with mean flame position overlaid

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Fig. 18

Plots of (a) flame root angle and (b) chemiluminescence intensity of vertical slices around the circumference of a single outer flame as a function of rotation angle

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