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

An Experimental and Computational Study of a Swirl-Stabilized Premixed Flame

[+] Author and Article Information
Ashoke De, Shengrong Zhu

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

Sumanta Acharya1

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803; Turbine Innovation and Energy Research Center, Louisiana State University, Baton Rouge, LA 70803acharya@me.lsu.edu

1

Corresponding author.

J. Eng. Gas Turbines Power 132(7), 071503 (Apr 09, 2010) (8 pages) doi:10.1115/1.4000141 History: Received April 24, 2009; Revised April 28, 2009; Published April 09, 2010; Online April 09, 2010

An unconfined strongly swirled flow is investigated for different Reynolds numbers using particle image velocimetry (PIV) and large eddy simulation (LES) with a thickened-flame (TF) model. Both reacting and nonreacting flow results are presented. In the LES-TF approach, the flame front is resolved on the computational grid through artificial thickening and the individual species transport equations are directly solved with the reaction rates specified using Arrhenius chemistry. Good agreement is found when comparing predictions with the experimental data. Also the predicted root mean square (rms) fluctuations exhibit a double-peak profile with one peak in the burnt and the other in the unburnt region. The measured and predicted heat release distributions are in qualitative agreement with each other and exhibit the highest values along the inner edge of the shear layer. The precessing vortex core (PVC) is clearly observed in both the nonreacting and reacting cases. However, it appears more axially elongated for the reacting cases and the oscillations in the PVC are damped with reactions.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sectional view of the swirl injector

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Figure 2

Streamline patterns for nonreacting flow condition [D: center-body diameter)]: (a) Re=10,144 and (b) Re=13,339

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Figure 3

Nonreacting flow results for Re=13,339 at different axial locations [r1=(r/2D)×25.4;  X2,  X3,  X4=(X/2D)×25.4]: Experimental data (△); lines are LES predictions: fine mesh (—), coarse mesh (- – – –). Mean axial velocity U/Uo, mean tangential velocity W/Uo, axial velocity fluctuation u′/Uo, and tangential velocity fluctuation w′/Uo

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Figure 4

Mean temperature field streamline patterns for reacting flow condition: (a) Re=10,144 and (b) Re=13,339

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Figure 5

Snapshots of isovorticity surface at ω=13 s−1 for nonreacting flow (left) and reacting flow (right) conditions: (a) Re=10,144 and (b) Re=13,339

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Figure 6

Snapshots of gas expansion (top), baroclinic production (middle), and diffusion term (bottom) for nonreacting (upper half) and reacting flow (lower half) conditions for Re=13,339

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Figure 7

Spectrum of axial velocity fluctuations for non reacting and reacting cases for Re=10,144

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Figure 8

Reacting flow results for Re=13,339 at different axial locations [r1=(r/2D)×25.4;  X2,  X3,  X4=(X/2D)×25.4]: Experimental data (△); lines are LES predictions (—). Axial velocity U/Uo and axial velocity fluctuation u′/Uo

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Figure 9

Mean species concentration for Re=13,339 at two axial locations [r1=(r/2D)×25.4;  X1,  X4=(X/2D)×25.4]: CH4 (—), O2 (– – –), H2O(⋅⋅–), CO2(⋅-⋅-), and 10×CO (– –)

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Figure 10

Experimental CH-chemiluminescence measurement (left), computational mean heat release (W/m3) predictions at center plane (middle), and computational mean heat release (W/m3) predictions averaged across flame (right) for Re=13,339

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