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Instability mode and flame structure analysis of various fuel compositions in a model gas turbine combustor

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Abstract

An experimental study was conducted under various operating conditions with a model gas turbine combustor to examine the relation between combustion instability and fuel composition. Mode analysis was conducted in unstable conditions based on measured dynamic data, and the flame structure was visualized by OH-chemiluminescence and the phase-resolved OH-PLIF measurement technique. Heat input and inlet air temperature variation experiments using various fuel compositions showed that combustion instability occurs under certain conditions and the instability frequency varies based on fuel composition. Fuel composition influences the combustion dynamic characteristics and three kinds of instability frequency ranges were found under the same geometry and heat input conditions. These instabilities are the 3rd, 4th, and 6th harmonics of the fundamental longitudinal mode, and the composition of the fuel affects the occurrence of various modes. Dump plane temperature characteristics were also studied at unstable conditions and the reason for the temperature variation was found using flame visualization techniques.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-742, Korea

    Jisu Yoon, Seongpil Joo, Jeong** Kim & Youngbin Yoon

  2. Department Safety Engineering, Incheon National University, Incheon, 406-772, Korea

    Min-Chul Lee

Authors
  1. Jisu Yoon
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  2. Min-Chul Lee
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  3. Seongpil Joo
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  4. Jeong** Kim
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  5. Youngbin Yoon
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Corresponding author

Correspondence to Youngbin Yoon.

Additional information

This paper was presented at the AJCPP-2014, Jeju Grand Hotel, Jeju, Korea, March 5–8, 2014. Recommended by Guest Editor Heuy Dong Kim

Youngbin Yoon is a professor of Seoul National University, Korea. He received his Ph.D. from University of Michigan, USA in 1994. His research fields are liquid rocket engine injectors, combustion dynamics in gas turbine and ramjet engines, low emission combustor, turbulent diffusion flames and laser diagnostics.

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Yoon, J., Lee, MC., Joo, S. et al. Instability mode and flame structure analysis of various fuel compositions in a model gas turbine combustor. J Mech Sci Technol 29, 899–907 (2015). https://doi.org/10.1007/s12206-015-0203-1

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  • DOI: https://doi.org/10.1007/s12206-015-0203-1

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