Interaction of the Acoustic Properties of a Combustion Chamber With Those of Premixture Supply

Lawn, Chris

doi:10.1006/jsvi.1998.2182

Cited by 20 publications

(3 citation statements)

References 7 publications

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“…The sound field in a gas turbine combustor can be considered as one-dimensional because of the typically large wavelength compared to the characteristic diameter of the combustor. For this reason one-dimensional acoustic models [44,51,96,104,136] have been used to describe the acoustics of a combustion system.…”

Section: One-dimensional Acoustic Wave Propagationmentioning

confidence: 99%

Acoustic pressure oscillations induced by confined turbulent premixed natural glas flames

Kampen¹

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Section: One-dimensional Acoustic Wave Propagationmentioning

confidence: 99%

Acoustic pressure oscillations induced by confined turbulent premixed natural glas flames

Kampen¹

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“…At the excited frequencies, these coherent contributions are due to acoustic plane waves. Thus they can be compared with the ratio jp w /p f j for these waves and this was calculated over the whole of the spectrum using the methods described by Lawn [17]. The burner supply system was modelled as a cylinder of the diameter of the inlet pipe (51 mm), followed by a sudden contraction at the entry to the tapered section.…”

Section: Acoustic Analysismentioning

confidence: 99%

The thermo-acoustic response of a premixed swirl burner

Lawn

2000

Proceedings of the Institution of Mechanical Engineers, Part A:

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Application of the theory of thermo-acoustic excitation of flames requires a detailed knowledge of the flame response to plane-wave velocity fluctuations of a given frequency through the burner. A model of the type of swirl burner used in some designs of industrial gas turbine is investigated, chemiluminescent emission being used as a marker of the hear release from both methane and propane premixed flames. The effects of the equivalence ratio and the withdrawal of the swirler so as to allow an annulus of unswirled premixture are also examined. It is found that there are two distinct modes of self-excitation. The response of different burner configurations in the mode with the higher frequency is analysed in terms of four parameters. These characterize the position and spread of the axial distribution of heat release fluctuations, and the origin and effective velocity of convection of disturbances. From these parameters, the Rayleigh integral can be calculated and this defines the frequency range over which excitation is possible. If the acoustic conditions require that the flame is lengthened, retracting the swirler, reducing the equivalence ratio or changing from propane to methane are all shown to be possible control measures for this particular burner.

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“…Modern premixed gas turbine combustors are usually operated near the lean blowout limit due to emission requirements [1]. Lean premixed combustion decreases the adiabatic flame temperature thus reducing the production rate of nitric oxides which is highly temperature dependent [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamics, NOx and Flashback Characteristics of Confined Pre-Mixed Hydrogen Enriched Methane Flames

Tunçer

Acharya

Uhm

2007

Volume 2: Turbo Expo 2007

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The operating regime of a gas turbine combustor is highly sensitive to fuel composition changes. In particular, the addition of hydrogen, a major constituent of syngas, has a major effect on flame behavior due to the higher burning rates associated with hydrogen. A laboratory scale pre-mixed test rig is constructed in order to study such effects. The fuel composition is incremented with increasing hydrogen starting from 100% methane. It is observed that increased RMS pressure levels and higher susceptibility to flashback occurs with increasing hydrogen volume fraction. Furthermore, hydrogen enrichment can cause an abrupt change in the dominant acoustic mode. Phase locked hydroxyl PLIF measurements have been performed with respect to the dominant acoustic instability limit cycle. These measurements are complemented with real time heat release, emissions and flashback measurements. Particular emphasis is put on time resolving the thermoacoustic instability induced flashback cycle of the wedgeshaped flame front and the temporal events associated with flashback.

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Interaction of the Acoustic Properties of a Combustion Chamber With Those of Premixture Supply

Cited by 20 publications

References 7 publications

Acoustic pressure oscillations induced by confined turbulent premixed natural glas flames

Acoustic pressure oscillations induced by confined turbulent premixed natural glas flames

The thermo-acoustic response of a premixed swirl burner

Dynamics, NOx and Flashback Characteristics of Confined Pre-Mixed Hydrogen Enriched Methane Flames

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