Flame structure and emissions characteristics of a lean premixed gas turbine combustor

Foglesong, Robert E.; R., Frazier, Timothy; Flamand, Luis; Peters, James E.; Lucht, Robert P.

doi:10.2514/6.1999-2399

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…Dump combustors are widely used in gas turbine engines and ramjet engines due to their suitable geometrical feature for flame stabilisation. Modern gas turbine engines are commonly operated under fuel-lean premixed flames or partially premixed flames to avoid environmental problems (1)(2)(3) . Premixed flames in the vicinity of blow-off limit often become unstable.…”

Section: Introductionmentioning

confidence: 99%

Combustion instability characteristics in a dump combustor using different hydrocarbon fuels

2019

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The combustion instability characteristics in a model dump combustor with an exhaust nozzle were experimentally investigated. The first objective was to understand the effects of operating conditions and geometric conditions on combustion instability. The second objective was to examine more generalised parameters that affect the onset of combustion instability. Three different premixed gases consisting of air and hydrocarbon fuels (C2H4, C2H6, C3H8) were burnt in the dump combustor at various inlet velocity, equivalence ratio and combustion chamber length. Dynamic pressure transducer and photomultiplier tube with a bandpass filter were used to measure pressure fluctuation and CH* chemiluminescence data. Peak frequencies and their maximum power spectral densities of pressure fluctuations at same equivalence ratios showed different trends for each fuel. However, the dynamic combustion characteristics of pressure fluctuations displayed consistent results under similar characteristics chemistry times regardless of the used hydrocarbon fuels. The results showed that characteristic chemistry time and characteristic convection time influenced combustion instabilities. It was found that the convective-acoustic combustion instability could be prevented by increasing the characteristic chemistry time and characteristic convection time.

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Section: Introductionmentioning

confidence: 99%

Combustion instability characteristics in a dump combustor using different hydrocarbon fuels

2019

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“…Gas turbine engines are generally designed to work at low equivalence ratios to reduce NOX formation due to strict emission regulations (Lefebvre 1977;Foglesong et al 1999;Lieuwen and Yang 2005) and ramjet engines are operated in the vicinity of a stoichiometric condition to increase the combustion efficiency (Bondaryuk and Il'yashenko 1960).…”

Section: Introductionmentioning

confidence: 99%

Flame Length Scaling of C2H4-Air Premixed Flames under Acoustic Forcing

Hwang

Ahn

Yoon

2018

JAFM

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An experimental study has been carried out to investigate the effects of inlet velocity, equivalence ratio, and acoustic forcing on flame lengths and flame center lengths in a dump combustor. A premixed gas of ethylene and air was supplied to a combustor through an inlet section and an acoustic driver was used to generate acoustic forcing to simulate unstable combustion. By changing these parameters, combustion tests were performed and flame images were taken using an ICCD camera with a bandpass filter corresponding to a CH* chemiluminescence band. Flame lengths/flame center lengths were obtained from the flame images and were analyzed with respect to dimensional parameters. For a more general finding, the flame length and flame center length were normalized by the inlet width. The dimensional parameters were also replaced with nondimensional parameters such as the Reynolds number, Strouhal number, Damköhler number, and normalized inlet velocity fluctuation, since dimensional parameters have a complex influence on these non-dimensional parameters. The normalized flame lengths and flame center lengths could be expressed well as a function of the non-dimensional parameters. It was found that an increase in the Reynolds number and a decrease in the Strouhal number, Damköhler number and normalized inlet velocity fluctuation caused the flame length/flame center length to become greater.

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Combustion instability mechanism of a lean premixed gas turbine combustor

Seo

2003

KSME International Journal

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Flame structure and emissions characteristics of a lean premixed gas turbine combustor

Cited by 8 publications

References 5 publications

Combustion instability characteristics in a dump combustor using different hydrocarbon fuels

Combustion instability characteristics in a dump combustor using different hydrocarbon fuels

Flame Length Scaling of C2H4-Air Premixed Flames under Acoustic Forcing

Combustion instability mechanism of a lean premixed gas turbine combustor

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