Investigation of the Effect of Chemical Kinetics and Combustion Model on the Flame Transfer Function of a Diluent Premixed Gas Turbine Using LES

Document Type : Original Article

Authors

Khajeh Nasiredine Toosi University of Technology, Department of Aerospace Engineering, Combustion and Propulsion Research Laboratory, Tehran, Iran

Abstract

One of the methods of investigating combustion instability is to simulate the flame response to acoustic oscillations. In the present study, in order to model the acoustic oscillations, the artificial excitation method "single frequency harmonic velocity" in the longitudinal direction has been used. The effect of this oscillation on the flame is expressed by numerical solution of LES in the form of flame transfer function (FTF) that chemical kinetics and combustion model have a great effect on determining this function. The combustion simulation results for methane premixed flame showed that although the 17-component EDC combustion model has twice the computational cost compared to the 6-component TF combustion model, it reduces the numerical solution error for calculating the FTF function to less than 5%. After simulation by using Fourier transform of FTF, the amplitude and phase are calculated. The FTF amplitude shows two maximum values at 30-20 Hz and 170 Hz and a minimum point at 80-110 Hz. Combustion instability can be investigated by solving the acoustic equation (Helmholtz) and placing the amplitude and phase of the FTF function as the heat release term in this equation.
 

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References

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History

  • Receive Date: 19 December 2021
  • Revise Date: 29 January 2022
  • Accept Date: 20 March 2022

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