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

Spatiotemporal Distribution of Soot Temperature for Flames Using Optical Pyrometry Under Unsteady Inlet Airflow Conditions

[+] Author and Article Information
Arda Cakmakci, Michael Knadler

Combustion Research Laboratory,
School of Aerospace Systems,
University of Cincinnati,
Cincinnati, OH 45220

Jong Guen Lee

Combustion Research Laboratory,
School of Aerospace Systems,
University of Cincinnati,
Cincinnati, OH 45220
e-mail: Jongguen.lee@uc.edu

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 12, 2016; final manuscript received August 24, 2016; published online December 7, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(5), 051502 (Dec 07, 2016) (8 pages) Paper No: GTP-16-1406; doi: 10.1115/1.4034969 History: Received August 12, 2016; Revised August 24, 2016

Two pyrometric tools for measuring soot temperature response in fuel-rich flames under unsteady inlet airflow conditions are developed. High-speed pyrometry using a high-speed color camera is used in producing soot temperature distributions, with its results compared with those of global soot temperature response measured using a multiwavelength pyrometer. For the former, the pixel red, green, and blue (RGB) values pertaining to respective bandwidths of red, green, and blue filters are used to calculate temperature and for the latter, the emission from whole flame at 660 nm, 730 nm, and 800 nm is used to measure temperature. The combustor, running on jet-A fuel, achieves unsteady inlet airflow using a siren running at frequencies of 150 and 250 Hz and with modulation levels (root mean square (RMS)) 20–50% of mean velocity. Spatiotemporal response of flame temperature measured by the high-speed camera is presented by phase-averaged with average subtracted images and by fast Fourier transform (FFT) at the modulation frequencies of inlet velocity. Simultaneous measurement of combustor inlet air velocity and flame soot temperature using the multiwavelength pyrometer is used in calculating the flame transfer function (FTF) of flame temperature response to unsteady inlet airflow. The results of global temperature and temperature fluctuation from the three-color pyrometer show qualitative agreement with the local temperature response measured by the high-speed camera. Over the range of operating conditions employed, the overall flame temperature fluctuation increases linearly with respect to the inlet velocity fluctuation. The two-dimensional map of flame temperature under unsteady combustion determined using a high-speed digital color camera shows that the local temperature fluctuation during unsteady combustion occurs over relatively small region of flame and its level is greater (∼10% to 20%) than that of overall temperature fluctuation (∼1%).

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References

Figures

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Fig. 1

Cross-sectional view of combustion rig

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Fig. 2

Global three-color pyrometer assembly

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Fig. 3

Measured signal ratio versus monochromatic spectral intensity ratio of a blackbody: (a) I800/730, (b) I800/660, and (c)I730/660

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Fig. 4

Temperature (K) versus channel ratio (G/R)

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Fig. 5

Normalized temperature fluctuations versus inlet velocity fluctuations

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Fig. 6

Evolution of phase-averaged flame temperature fluctuation for 150 Hz at 25% modulation

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Fig. 7

Evolution of phase-averaged flame temperature fluctuation for 250 Hz at 23% modulation

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Fig. 8

Evolution of phase-averaged flame temperature fluctuation for 150 Hz at 52% modulation

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Fig. 9

Axial COM location versus phase (deg)

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Fig. 10

Video FFT result-evolution of flame temperature fluctuation for inlet flow modulation at 150 Hz with 25% of mean velocity

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Fig. 11

Video FFT result-evolution of flame temperature fluctuation for inlet flow modulation at 250 Hz with 23% of mean velocity

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Fig. 12

Video FFT result-evolution of flame temperature fluctuation for inlet flow modulation at 150 Hz with 52% of mean velocity

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