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

Swirl Flame Response to Simultaneous Axial and Transverse Velocity Fluctuations

[+] Author and Article Information
Aditya Saurabh

Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: aditya.saurabh@tu-berlin.de

Jonas P. Moeck, Christian Oliver Paschereit

Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 17, 2016; final manuscript received September 12, 2016; published online January 18, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(6), 061502 (Jan 18, 2017) (7 pages) Paper No: GTP-16-1414; doi: 10.1115/1.4035231 History: Received August 17, 2016; Revised September 12, 2016

In this experimental study, we investigate the impact of transverse acoustic velocity fluctuations on flame response to axial velocity fluctuations. Such a scenario where a flame is under the influence of a 2D acoustic field occurs in annular gas turbine combustors during thermoacoustic instability. A generic premixed swirl flame is exposed to simultaneous transverse and axial acoustic forcing. The amplitude of axial forcing was kept constant, while the amplitude and relative phase (with respect to axial forcing) of the transverse forcing was systematically varied. Results obtained indicate that transverse velocity affects flame response, and that both the magnitude of transverse velocity and its phase with respect to axial forcing are important factors.

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Figures

Grahic Jump Location
Fig. 1

Sketch showing an azimuthal acoustic mode in an annular chamber with multiple burners. It can be visualized that the impact of transverse acoustics on individual flames can be studied in single burner rigs, as in the present study. At a given instant, different burners can be expected to experience different combinations of transverse—and possibly axial—acoustic velocity and pressure. (Color is available online.)

Grahic Jump Location
Fig. 2

An illustration depicting extreme cases of transverse forcing configurations: pressure antinode forcing, velocity antinode forcing, and traveling wave forcing

Grahic Jump Location
Fig. 3

The atmospheric transverse acoustic forcing combustion rig. The swirl flame stabilizes at the centerbody of the burner as indicated by the red curves. Acoustic forcing is provided from the speakers on each of the transverse ends and from the speaker mounted on the upstream duct. Acoustic field inside the ducts is determined using microphones. In addition, flame chemiluminescence fluctuations are acquired (not shown). (Color is available online.)

Grahic Jump Location
Fig. 4

The flame transfer function, F, magnitude (▲), corresponding spline fit (solid line), and (•) phase

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Fig. 5

Description of the acoustics generated at a transverse end in terms of f and g waves. The g-wave traveling toward the combustors is the summation of gref, the wave reflected from the boundary, and gsp, the g-wave from the speaker. Speaker inputs are adjusted to result in equal and 180 deg out-of-phase g-waves on the left and right sides of the combustor.

Grahic Jump Location
Fig. 6

Induced axial velocity in the burner v′ (top) and the transverse velocities generated in the left and right transverse ducts, u′left,U′right (magnitude—middle and phase difference—bottom) for an antisymmetric transverse acoustic forcing. Dashed lines correspond to the frequencies investigated (48 and 112 Hz).

Grahic Jump Location
Fig. 7

Variation in the flame response magnitude against variation in the relative phase between axial and transverse forcing, for increasing levels of transverse velocity forcing; 48 Hz. Error bars correspond to 95% confidence interval. The gray band represents the flame response to purely axial forcing (with 95% confidence interval). (Color is available online)

Grahic Jump Location
Fig. 8

Variation in the flame response magnitude against variation in the relative phase between axial and transverse forcing, for increasing levels of transverse velocity forcing; 112 Hz. Error bars correspond to 95% confidence interval. The gray band represents the flame response to purely axial forcing (with 95% confidence interval). (Color is available online)

Grahic Jump Location
Fig. 9

Variation in the phase of the flame response against variation in the relative phase between axial and transverse forcing, for increasing levels of transverse velocity forcing; 48 Hz. Error bars correspond to 95% confidence interval. The gray band represents the flame response to purely axial forcing (with 95% confidence interval). (Color is available online.)

Grahic Jump Location
Fig. 10

Variation in the phase of the flame response against variation in the relative phase between axial and transverse forcing, for increasing levels of transverse velocity forcing; 112 Hz. Error bars correspond to 95% confidence interval. The gray band represents the flame response to purely axial forcing (with 95% confidence interval). (Color is available online)

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