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Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor

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Abstract

Wall temperatures were measured with thermographic phosphors on the quartz walls of a model combustor in ethylene/air swirl flames at 3 bar. Three operating conditions were investigated with different stoichiometries and with or without additional injection of oxidation air downstream of the primary combustion zone. YAG:Eu and YAG:Dy were used to cover a total temperature range of 1000–1800 K. Measurements were challenging due to the high thermal background from soot and window degradation at high temperatures. The heat flux through the windows was estimated from the temperature gradient between the in- and outside of the windows. Differences in temperature and heat flux density profiles for the investigated cases can be explained very well with the previously measured differences in flame temperatures and flame shapes. The heat loss relative to thermal load is quite similar for all investigated flames (15–16%). The results complement previous measurements in these flames to investigate soot formation and oxidation. It is expected, that the data set is a valuable input for numerical simulations of these flames.

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Acknowledgements

The authors gratefully acknowledge funding from the European Union within the project SOPRANO, “Soot Processes and Radiation in Aeronautical innovative combustion”, Horizon 2020 Grant agreement no. 690724.

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Authors and Affiliations

  1. German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70565, Stuttgart, Germany

    Patrick Nau, Zhiyao Yin, Klaus Peter Geigle & Wolfgang Meier

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  1. Patrick Nau
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  2. Zhiyao Yin
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  3. Klaus Peter Geigle
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  4. Wolfgang Meier
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Correspondence to Patrick Nau.

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Nau, P., Yin, Z., Geigle, K.P. et al. Wall temperature measurements at elevated pressures and high temperatures in sooting flames in a gas turbine model combustor. Appl. Phys. B 123, 279 (2017). https://doi.org/10.1007/s00340-017-6856-y

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