Acoustoelastic interaction in combustion chambers: Modeling and experiments

R.A. Huls, J.F. van Kampen, Peter van der Hoogt, Jacobus B.W. Kok, Andries de Boer

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

To decrease NOx emissions from combustion systems, lean premixed combustion is used. A disadvantage is the higher sensitivity to combustion instabilities, leading to increased sound pressure levels in the combustor and resulting in an increased excitation of the surrounding structure: the liner. This causes fatigue, which limits the lifetime of the combustor. This paper presents a joint experimental and numerical investigation of this acoustoelastic interaction problem for frequencies up to 1 kHz. To study this problem experimentally, a test setup has been built consisting of a single burner, 500 kW, 5 bar combustion system. The thin structure (liner) is contained in a thick pressure vessel with optical access for a traversing laser vibrometer system to measure the vibration levels of the liner. The acoustic excitation of the liner is measured using pressure sensors measuring the acoustic pressures inside the combustion chamber. For the numerical model, the finite element method with full coupling between structural vibration and acoustics is used. The flame is modeled as an acoustic volume source corresponding to a heat release rate that is frequency independent. The temperature distribution is taken from a Reynolds averaged Navier Stokes (RaNS) computational fluid dynamics (CFD) simulation. Results show very good agreement between predicted and measured acoustic pressure levels. The predicted and measured vibration levels also match fairly well.
Original languageUndefined
Pages (from-to)1-8
JournalJournal of engineering for gas turbines and power
Volume130
Issue number5
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-249469
  • IR-72324

Cite this

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title = "Acoustoelastic interaction in combustion chambers: Modeling and experiments",
abstract = "To decrease NOx emissions from combustion systems, lean premixed combustion is used. A disadvantage is the higher sensitivity to combustion instabilities, leading to increased sound pressure levels in the combustor and resulting in an increased excitation of the surrounding structure: the liner. This causes fatigue, which limits the lifetime of the combustor. This paper presents a joint experimental and numerical investigation of this acoustoelastic interaction problem for frequencies up to 1 kHz. To study this problem experimentally, a test setup has been built consisting of a single burner, 500 kW, 5 bar combustion system. The thin structure (liner) is contained in a thick pressure vessel with optical access for a traversing laser vibrometer system to measure the vibration levels of the liner. The acoustic excitation of the liner is measured using pressure sensors measuring the acoustic pressures inside the combustion chamber. For the numerical model, the finite element method with full coupling between structural vibration and acoustics is used. The flame is modeled as an acoustic volume source corresponding to a heat release rate that is frequency independent. The temperature distribution is taken from a Reynolds averaged Navier Stokes (RaNS) computational fluid dynamics (CFD) simulation. Results show very good agreement between predicted and measured acoustic pressure levels. The predicted and measured vibration levels also match fairly well.",
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author = "R.A. Huls and {van Kampen}, J.F. and {van der Hoogt}, Peter and Kok, {Jacobus B.W.} and {de Boer}, Andries",
year = "2008",
doi = "10.1115/1.2938391",
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volume = "130",
pages = "1--8",
journal = "Journal of engineering for gas turbines and power",
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}

Acoustoelastic interaction in combustion chambers: Modeling and experiments. / Huls, R.A.; van Kampen, J.F.; van der Hoogt, Peter; Kok, Jacobus B.W.; de Boer, Andries.

In: Journal of engineering for gas turbines and power, Vol. 130, No. 5, 2008, p. 1-8.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Acoustoelastic interaction in combustion chambers: Modeling and experiments

AU - Huls, R.A.

AU - van Kampen, J.F.

AU - van der Hoogt, Peter

AU - Kok, Jacobus B.W.

AU - de Boer, Andries

PY - 2008

Y1 - 2008

N2 - To decrease NOx emissions from combustion systems, lean premixed combustion is used. A disadvantage is the higher sensitivity to combustion instabilities, leading to increased sound pressure levels in the combustor and resulting in an increased excitation of the surrounding structure: the liner. This causes fatigue, which limits the lifetime of the combustor. This paper presents a joint experimental and numerical investigation of this acoustoelastic interaction problem for frequencies up to 1 kHz. To study this problem experimentally, a test setup has been built consisting of a single burner, 500 kW, 5 bar combustion system. The thin structure (liner) is contained in a thick pressure vessel with optical access for a traversing laser vibrometer system to measure the vibration levels of the liner. The acoustic excitation of the liner is measured using pressure sensors measuring the acoustic pressures inside the combustion chamber. For the numerical model, the finite element method with full coupling between structural vibration and acoustics is used. The flame is modeled as an acoustic volume source corresponding to a heat release rate that is frequency independent. The temperature distribution is taken from a Reynolds averaged Navier Stokes (RaNS) computational fluid dynamics (CFD) simulation. Results show very good agreement between predicted and measured acoustic pressure levels. The predicted and measured vibration levels also match fairly well.

AB - To decrease NOx emissions from combustion systems, lean premixed combustion is used. A disadvantage is the higher sensitivity to combustion instabilities, leading to increased sound pressure levels in the combustor and resulting in an increased excitation of the surrounding structure: the liner. This causes fatigue, which limits the lifetime of the combustor. This paper presents a joint experimental and numerical investigation of this acoustoelastic interaction problem for frequencies up to 1 kHz. To study this problem experimentally, a test setup has been built consisting of a single burner, 500 kW, 5 bar combustion system. The thin structure (liner) is contained in a thick pressure vessel with optical access for a traversing laser vibrometer system to measure the vibration levels of the liner. The acoustic excitation of the liner is measured using pressure sensors measuring the acoustic pressures inside the combustion chamber. For the numerical model, the finite element method with full coupling between structural vibration and acoustics is used. The flame is modeled as an acoustic volume source corresponding to a heat release rate that is frequency independent. The temperature distribution is taken from a Reynolds averaged Navier Stokes (RaNS) computational fluid dynamics (CFD) simulation. Results show very good agreement between predicted and measured acoustic pressure levels. The predicted and measured vibration levels also match fairly well.

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