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Modeling of natural acoustic frequencies of a gas-turbine plant combustion chamber

  • Steam Turbine, Gas Turbine, Steam-Gas Plants and Accessory Equipment
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Abstract

The paper presents results of determination of natural acoustic frequencies of a gas-turbine plant annular combustion chamber model using 3D-simulation. At the beginning, a calculation procedure for determining natural acoustic frequencies of the gas-turbine plant combustion chamber was worked out. The effect of spatial inhomogeneity of the flow parameters (fluid composition, pressure, temperature) arising in combustion and some geometrical parameters (cooling holes of the flame tube walls) on the calculation results is studied. It is found that the change of the fluid composition in combustion affects the acoustic velocity not more than 5%; therefore, the air with a volume variable temperature can be taken as a working fluid in the calculation of natural acoustic frequencies. It is also shown that the cooling holes of the flame tube walls with diameter less than 2 mm can be neglected in the determination of the acoustic modes in the frequency range of up to 1000 Hz. This reduces the number of the grid-model elements by a factor of six in comparison with a model that considers all of the holes. Furthermore, a method of export of spatial inhomogeneity of the flow parameters from a CFD solver sector model to the annular combustion chamber model in a modal solver is presented. As a result of the obtained model calculation, acoustic modes of the combustion chamber in the frequency range of up to 1000 Hz are determined. For a standard engine condition, a potentially dangerous acoustic mode with a frequency close to the ripple frequency of the precessing vortex core, which is formed behind the burner device of this combustion chamber, is detected.

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Authors and Affiliations

  1. Samara National Research University, Samara, 443086, Russia

    I. A. Zubrilin, N. I. Gurakov, R. A. Zubrilin & S. G. Matveev

Authors
  1. I. A. Zubrilin
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  2. N. I. Gurakov
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  3. R. A. Zubrilin
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  4. S. G. Matveev
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Correspondence to I. A. Zubrilin.

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Original Russian Text © I.A. Zubrilin, N.I. Gurakov, R.A. Zubrilin, S.G. Matveev, 2017, published in Teploenergetika.

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Zubrilin, I.A., Gurakov, N.I., Zubrilin, R.A. et al. Modeling of natural acoustic frequencies of a gas-turbine plant combustion chamber. Therm. Eng. 64, 372–378 (2017). https://doi.org/10.1134/S0040601517050093

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  • DOI: https://doi.org/10.1134/S0040601517050093

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