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Research Papers

Measurements of Periodic Reynolds Stress Oscillations in a Forced Turbulent Premixed Swirling Flame

[+] Author and Article Information
Christopher Douglas

Ben T. Zinn Combustion Lab,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: cmdouglas@gatech.edu

Jamie Lim, Travis Smith, Benjamin Emerson, Timothy Lieuwen

Ben T. Zinn Combustion Lab,
Georgia Institute of Technology,
Atlanta, GA 30332

Naibo Jiang, Christopher Fugger, Tongxun Yi, Josef Felver

Spectral Energies, LLC,
Dayton, OH 45430

Sukesh Roy

Spectral Energies, LLC,
Dayton, OH 45430
e-mail: sukesh.roy@spectralenergies.com

James Gord

Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mail: james.gord@us.af.mil

Manuscript received June 22, 2018; final manuscript received June 25, 2018; published online August 31, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(1), 011001 (Aug 31, 2018) (9 pages) Paper No: GTP-18-1303; doi: 10.1115/1.4040686 History: Received June 22, 2018; Revised June 25, 2018

This work is motivated by the thermoacoustic instability challenges associated with ultra-low emissions gas turbine (GT) combustors. It demonstrates the first use of high-speed dual-plane orthogonally-polarized stereoscopic-particle image velocimetry (PIV) and synchronized OH planar laser-induced fluorescence in a premixed swirling flame. We use this technique to explore the effects of combustion and longitudinal acoustic forcing on the time- and phase-averaged flow field—particularly focusing on the behavior of the Reynolds stress in the presence of harmonic forcing. We observe significant differences between ensemble-averaged and time-averaged Reynolds stress. This implies that the large-scale motions are nonergodic, due to coherent oscillations in Reynolds stress associated with the convection of periodic vortical structures. This result has important implications on hydrodynamic stability models and reduced-order computational fluid dynamics simulations, which do show the importance of turbulent transport on the problem, but do not capture these coherent oscillations in their models.

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References

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Figures

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Fig. 1

Schematic of the diagnostics layout and coordinate system (not to scale)

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Fig. 2

Sequential instantaneous field from dual-plane stereoscopic PIV and OH-PLIF for case 3. Contours represent out-of-plane velocity, vectors in-plane velocity, and lines flame position.

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Fig. 3

Time-mean velocity field for each of the four cases. For the reacting cases, lines show the 20% and 80% OH-PLIF PVF contours. Velocities are normalized by the nominal flow speed of 25 m/s.

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Fig. 4

Experimental time-mean Reynolds stress tensors. PVF contour lines are overlaid for the reacting cases.

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Fig. 5

Coherent part of the velocity fields for each of the four cases. For the reacting cases, lines show the 20% and 80% OH-PLIF phase-averaged PVF contours.

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Fig. 6

Coherent part of the experimental Reynolds stress tensors (top) and vv-component of the coherent Reynolds stress tensors for the forced cases as a function of phase (bottom). Phase-averaged PVF contour lines are overlaid for the reacting cases.

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