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Research Papers

Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

[+] Author and Article Information
Patrick Nau

Institute of Combustion Technology,
German Aerospace Center (DLR),
Stuttgart 70569, Germany
e-mail: patrick.nau@dlr.de

Zhiyao Yin, Oliver Lammel, Wolfgang Meier

Institute of Combustion Technology,
German Aerospace Center (DLR),
Stuttgart 70569, Germany

1Corresponding author.

Manuscript received June 22, 2018; final manuscript received June 26, 2018; published online December 4, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(4), 041021 (Dec 04, 2018) (9 pages) Paper No: GTP-18-1278; doi: 10.1115/1.4040716 History: Received June 22, 2018; Revised June 26, 2018

Phosphor thermometry has been developed for wall temperature measurements in gas turbines and gas turbine model combustors. An array of phosphors has been examined in detail for spatially and temporally resolved surface temperature measurements. Two examples are provided, one at high pressure (8 bar) and high temperature and one at atmospheric pressure with high time resolution. To study the feasibility of this technique for full-scale gas turbine applications, a high momentum confined jet combustor at 8 bar was used. Successful measurements up to 1700 K on a ceramic surface are shown with good accuracy. In the same combustor, temperatures on the combustor quartz walls were measured, which can be used as boundary conditions for numerical simulations. An atmospheric swirl-stabilized flame was used to study transient temperature changes on the bluff body. For this purpose, a high-speed setup (1 kHz) was used to measure the wall temperatures at an operating condition where the flame switches between being attached (M-flame) and being lifted (V-flame) (bistable). The influence of a precessing vortex core (PVC) present during M-flame periods is identified on the bluff body tip, but not at positions further inside the nozzle.

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Figures

Grahic Jump Location
Fig. 1

(a) Schematic of the optical setup for simultaneous phosphor thermometry and OH LIF measurements [23]. (b) Phosphor coating on the base plate and bluff body of the combustor. Measurement positions 1–5 on the bluff body are marked.

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Fig. 2

Schematic of the FLOX® model combustor with coordinate system, dimensions, and optical arrangement for wall temperature measurements

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Fig. 3

Emission spectra of the investigated phosphors after excitation at 355 nm (YAG:Dy and SV67), 266 nm (YAG:Eu and YAG:Tb), or 532 nm (ruby). Spectra of YAG:Dy and YAG:Tb were measured in a furnace at 1100 K. The spectrum of YAG:Eu is adapted from Kissel et al. [26] and measured at room temperature, as well as the spectra of SV67 and ruby.

Grahic Jump Location
Fig. 4

Calibration curves for the investigated phosphors. A polynomial fitted to the measured data points is drawn as a line.

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Fig. 5

Sensitivity of the investigated phosphors calculated with Eq. (2) from the calibration curves (decay rate τ against temperature T) shown in Fig. 4

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Fig. 6

Decay curves of YAG:Tb and YAG:Eu at 1100 K. The inset shows the influence of the fitting window (tstart = c1 × τ and tend = c2 × τ as defined in Ref. [18]) on the obtained decay rate.

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Fig. 7

Average OH* chemiluminescence images taken during the V- and M-flame periods adopted from Yin et al. [23]

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Fig. 8

Time traces of the wall temperature (left) on the bluff body for positions 1 (bluff body tip, y = 0 mm) to 5 (y = −2 mm). The gray regions in the time traces denote M-shape flame operation and were used for the calculation of the fast Fourier transformation (right).

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Fig. 9

Temperature on a ceramic probe for different flame conditions. Error bars include errors from the calibration procedure and the measurement precision. The relative standard deviation of individual laser shots is shown in the bottom.

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Fig. 10

Temperatures on the combustor quartz walls. The temperature field was interpolated between the measurement points (YAG:Eu: squares and YAG:Dy: diamonds).

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