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

Analysis of Measured Flame Transfer Functions With Locally Resolved Density Fluctuation and OH-Chemiluminescence Data

[+] Author and Article Information
Johannes Peterleithner

Institute for Thermal Turbomachinery
and Machine Dynamics,
Graz University of Technology,
Inffeldgasse 25/a,
Graz 8010, Austria
e-mail: Johannes.peterleithner@tugraz.at

Nicolai V. Stadlmair, Thomas Sattelmayer

Lehrstuhl für Thermodynamik,
Technische Universität München,
Garching 85748, Germany

Jakob Woisetschläger

Institute for Thermal Turbomachinery
and Machine Dynamics,
Graz University of Technology,
Graz 8010, Austria

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 14, 2015; final manuscript received August 6, 2015; published online September 22, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(3), 031504 (Sep 22, 2015) (9 pages) Paper No: GTP-15-1301; doi: 10.1115/1.4031346 History: Received July 14, 2015; Revised August 06, 2015

The goal of this study is to analyze flame transfer functions (FTFs) locally by quantifying the heat release rate with OH*-chemiluminescence and density fluctuation measurements using laser vibrometry. In this study, both techniques are applied to a swirl burner configuration with known FTFs acquired by multimicrophone-method (MMM) measurements for perfectly premixed and partially premixed cases. The planar fields of the quantities are compared to the FTFs in order to improve the understanding regarding the specific amplitude and phase values. On the global scale values of heat release expected from the MMM are satisfactorily reproduced by both methods for the premixed cases, whereas OH*-chemiluminescence data cannot be used as indicator for heat release in the partially premixed case, where equivalence ratio fluctuations are present. Vibrometry is not affected by fluctuations of equivalence ratio but additionally reveals the periodic oscillation of the conical annular jet of the cold reactants in the combustor filled with hot products.

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Fig. 3

Flow field (nonreacting case) and reaction zone from line-of-sight OH*-chemiluminescence in the combustor [20]

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Fig. 2

Coordinate system used for the vibrometer measurements and measurement points at an area of 75 × 70 mm (a). A single shot (b) and a time averaged OH* image (c) of chemiluminescence.

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Fig. 1

Schematic of the single burner test rig with modular swirl burner system

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Fig. 4

Flame transfer function FTFs measured with the multimicrophone method

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Fig. 5

Normalized heat release fluctuations extracted from the FTF

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Fig. 6

Integral OH*-chemiluminescence OH* detected by the photomultiplier

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Fig. 7

Phase-resolved OH*-chemiluminescence and density fluctuations, line-of-sight data

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Fig. 8

Convectively transported equivalence ratio wave at 200 Hz, (TPM200), line-of-sight data with Φ′ calculated according to Eq. (1)

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Fig. 9

Global OH*-chemiluminiescence fluctuations. The fluctuations are normalized by the PPM200 fluctuation amplitude.

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Fig. 10

Global density fluctuations. The fluctuations are normalized by the PPM200 fluctuation amplitude.

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Fig. 11

Phase-resolved OH*-chemiluminiescence and density fluctuations, Abel-deconvoluted data



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