International Journal of Aeronautical and Space Sciences

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Predicting the Frequency of Combustion Instability Using the Measured Reflection Coefficient through Acoustic Excitation

  • Bae, Jinhyun (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Yoon, Jisu (Korea Institute of Machinery & Materials) ;
  • Joo, Seongpil (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Jeoungjin (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Jeong, Chanyeong (Mechatronics R&D Center, Samsung Electronics Co., Ltd.) ;
  • Sohn, Chae Hoon (Department of Mechanical Engineering, Sejong University) ;
  • Borovik, Igor N. (Department of Rocket Engines, Moscow Aviation Institute) ;
  • Yoon, Youngbin (Department of Mechanical and Aerospace Engineering, Seoul National University)
  • Received : 2017.07.12
  • Accepted : 2017.12.07
  • Published : 2017.12.30
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Abstract

In this study, the reflection coefficient (RC) and the flame transfer function (FTF) were measured by applying acoustic excitation to a duct-type model combustor and were used to predict the frequency of the combustion instability (CI). The RC is a value that varies with the excitation frequency and the geometry of the combustor as well as other factors. Therefore, in this study, an experimentally measured RC was used to improve the accuracy of prediction in the cases of 25% and 75% hydrogen in a mixture of hydrogen and methane as a fuel. When the measured RCs were used, an unstable condition was correctly predicted, which had not been predicted when the RCs had been assumed to be a certain value. The reason why the CI occurred at a specific frequency was also examined by comparing the peak of the FTF with the resonance frequency, which was calculated using Helmholtz's resonator analysis and a resonance frequency equation. As the CI occurred owing to the interaction between the perturbation in the rate of heat release and that in the pressure, the CI was frequent when the peak of the FTF was close to the resonance frequency such that constructive interference could occur.

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References

  1. Im, J., "Current Status of Space Launch Vehicles and Analysis of Lunch Failures", Current Industrial and Technological Trends in Aerospace, Vol. 9, No. 2, 2011, pp. 3-15.
  2. Crocco, L., "Theoretical Studies on Liquid-Propellant Rocket Instability", Symposium (International) on Combustion, Vol. 10, No. 1, 1965, pp. 1101-1128. DOI:10.1016/S0082-0784(65)80249-1
  3. Ducruix, S., Durox, D. and Candel, S., "Theoretical and Experimental Determinations of the Transfer Function of a Laminar Premixed Flame", Proceedings of the Combustion Institute, Vol. 28, No. 1, 2000, pp. 765-773. DOI:10.1016/S0082-0784(00)80279-9
  4. Kim, D., "Linear Stability Analysis in a Gas Turbine Combustor Using Thermoacoustic Models", Journal of the Korean Society of Combustion, Vol. 17, No. 2, 2012, pp. 17-23.
  5. Kim, K. T., Lee, J. G., Quay, B. D. and Santavicca, D. A., "Spatially Distributed Flame Transfer Functions for Predicting Combustion Dynamics in Lean Premixed Gas Turbine Combustors", Combustion and Flame, Vol. 157, No. 9, 2010, pp. 1718-1730. DOI:10.1016/j.combustflame.2010.04.016
  6. Poinsot, T., Le Chatelier, C., Candel, S. M. and Esposito, E., "Experimental Determination of the Reflection Coefficient of a Premixed Flame in a Duct", Journal of Sound and Vibration, Vol. 107, No. 2, 1986, pp. 265-278. DOI:10.1016/0022-460X(86)90237-3
  7. Li, J., Yang, D., Luzzato, C. and Morgans, A. S., "Open-Source Combustion Instability Low-Order Simulator (OSCILOS-Long)-Technical report", Technical Report, 2015, pp. 1-48.
  8. Nanthagopal, K., Subbarao, R., Elango, T., Baskar, P. and Annamalai, K., "Hydrogen-Enriched Compressed Natural Gas (HCNG): A Futuristic Fuel for Internal Combustion Engines", Thermal Science, Vol. 15, No. 4, 2011, pp.1145-1154. DOI:10.2298/TSCI100730044N
  9. Standard, B., "Acoustics Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes-Part 2: Transfer Function Method", BS EN ISO (10534-2), 2001.
  10. Norris, A. N. and Sheng, I. C., "Acoustic Radiation from a Circular Pipe with an Infinite Flange", Journal of Sound and Vibration, Vol. 135, No. 1, 1989, pp. 85-93. DOI:10.1016/0022-460X(89)90756-6
  11. Gaydon, A. G. and Wolfhard, H. G., Flames: Their Structure, Radiation and Temperature, 4th ed., Chapman and Hall, London, 1979.
  12. Kojima, J., Ikeda, Y. and Nakajima, T., "Spatially Resolved Measurement of OH*, CH*, and C2* Chemiluminescence in the Reaction Zone of Laminar Methane/Air Premixed Flames", Proceedings of the Combustion Institute, Vol. 28, No. 2, 2000, pp. 1757-1764. DOI:10.1016/S0082-0784(00)80577-9
  13. Yoon, J., Lee, M., Joo, S., Kim, J. and Yoon, Y., "Instability Mode and Flame Structure Analysis of Various Fuel Compositions in a Model Gas Turbine Combustor", Journal of Mechanical Science and Technology, Vol. 29, No. 3, 2015, pp. 899-907. DOI:10.1007/s12206-015-0203-1