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Thermo-Acoustic Instability Simulation in Gas Turbine

Published online by Cambridge University Press:  05 May 2011

N. Akbari  and
N. S. Mehdizadeh
N. Akbari*
Affiliation:
Aerospace Eng. Department of Amirkabir University of Technology, Center of Excellence in Computational Aerospace Engineering, P.O. Box. 15875–4413, Tehran, Iran
N. S. Mehdizadeh*
Affiliation:
Aerospace Eng. Department of Amirkabir University of Technology, Center of Excellence in Computational Aerospace Engineering, P.O. Box. 15875–4413, Tehran, Iran
*
*Ph.D. student
**Assistant Professor, corresponding author
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Abstract

The main aims of this research are, at first, combustion instability study based on equivalence ratio oscillation, and, secondly, investigation various frequency modes of combustion instability, taking combustion chamber geometry into account. Considering the configuration of the simulated combustion chamber, excitation probability of the longitudinal modes is higher than that of transversal modes. The reason of this fact is that the resonance frequency values of the longitudinal modes are less than those of transversal modes. So, the most important frequency mode, during combustion instability, is the first longitudinal mode. In this paper thermo-acoustic instability model is utilized for pre-mixed gas turbines combustion chamber, founded on equivalence ratio oscillation. For this purpose Lieuwen method is developed in order to attain the phase difference between pressure and heat release oscillations. Results concluded from combustion instability simulation for the first longitudinal mode, considering its importance, are compared with experimental data and good agreement is observed.

Keywords

Combustion instabilityGas turbineThermo-acousticEquivalence ratio oscillation.

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Type
Articles
Information
Journal of Mechanics , Volume 25 , Issue 4 , December 2009 , pp. 433 - 440
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2009

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References

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