Response of a swirl-stabilized flame to simultaneous perturbations in equivalence ratio and velocity at high oscillation amplitudes

Ćosić, Bernhard; Steffen, Thomas; Moeck, Jonas P.; Paschereit, Christian Oliver

doi:10.1016/j.combustflame.2014.09.025

Cited by 66 publications

(33 citation statements)

References 59 publications

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“…It is shown how the sequence of reactant convective transport, mixing, and reaction events during an oscillation cycle is related to the pressure variation. This feedback mechanism is known as fuel flow rate and equivalence ratio oscillation coupled with a convective time delay, and was previously described in the literature [Candel 2002, Ćosić 2015, Lieuwen 1998, Lieuwen 2005, Sattelmayer 2003, Schürmans 2004. This analysis establishes a quantitative means of evaluating coupling mechanism predicted by simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the thermo-acoustic oscillations are expected to cause cyclical variations in the mixture fraction statistics, as was seen in previous studies [Ćosić 2015, Franzelli 2012, Lieuwen 1998, Sattelmayer 2003]. To present an overview of the phase-correlated Reynoldsaveraged values of the mixture fraction distribution, the results from the point measurements were interpolated to yield two-dimensional plots using the software "Origin 9.1".…”

Section: Variations Of Mixture Fraction and Temperaturementioning

confidence: 99%

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Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Section: Variations Of Mixture Fraction and Temperaturementioning

confidence: 99%

Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

et al. 2015

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“…Their thermoacoustic dynamics has been investigated in countless studies, e.g. [5,7,26,9,16]. Recently, an increasing number of studies dealing with the combustion process taking place in the second stage have been published.…”

Section: Introductionmentioning

confidence: 99%

“…One of the method advantages is, that the non-linear flame response which is characterised by a flame describing function (FDF) can be obtained by measuring the heat release rate response due to excitation with varying oscillation level (e.g. [7]). Nevertheless one disadvantage is the considerable computational cost because many simulations have to be performed to cover the range of excitation frequency and amplitude of interest.…”

Section: Introductionmentioning

confidence: 99%

“…A commonly used method to experimentally and numerically obtain the FTF is imposing sinusoidal harmonic excitation upstream of the flame and measuring the corresponding heat release rate response (e.g. [7,16,12]). One of the method advantages is, that the non-linear flame response which is characterised by a flame describing function (FDF) can be obtained by measuring the heat release rate response due to excitation with varying oscillation level (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Autoignition flame dynamics in sequential combustors

Schulz

Noiray

2018

Combustion and Flame

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This numerical study deals with the heat release rate response of a sequential combustor flame to temperature perturbations. These flames are found in the new generation of gas turbine combustors, which are based on sequential combustion technologies. It is shown that the temperature perturbations T upstream of the fuel injection induce mixture fraction oscillations Z which also propagate toward the reaction zone, and that the combination of these two perturbations yields a strongly nonlinear heat release rate response Q . Large Eddy Simulation (LES) were performed using an Analytically Reduced Chemistry (ARC) mechanism, which includes 22 transported species in combination with the Dynamic Thickened Flame model (DTF). The burner flame transfer function (BFTF) giving the flame response with respect to T is obtained using a broadbandexcitation-based system identification (SI) as well as harmonic single frequency excitations. A simplified configuration with perfectly premixed conditions is considered to quantify the respective contributions of the different types of perturbation. These simulations highlight (i) the strong nonlinearity of the flame response to temperature perturbations, and (ii) the difficulty to break down the global flame response into independent driving mechanisms by making use of "simplified" configurations.

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Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

Kumar

Chong

Karmakar

2021

Intl J of Energy Research

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Biofuels are carbon-neutral alternative fuels, which have emerged as an important source of energy for the aviation industry to reduce greenhouse gas emissions. Butanol is considered an emerging biofuel with properties that are suited for application in gas turbine engines. It is traditionally produced through the fermentation process of biomass (acetone-butanol-ethanol fermentation). To examine the feasibility of butanol as operating fuel, the combustion characteristics of butanol and butanol/Jet A-1 blends are examined in a labscale swirl stabilized burner, with emphasis on the effect of preheating because of the variation of inlet air temperature during flight operation. To rich the constant air temperature to 150 C, the incoming air (main air) is preheated and investigated for various equivalence ratios. Compared to neat Jet A-1, the flames of the butanol/Jet A-1 blends have shown a better effect on global emission characteristics with comparable temperature distribution on adding butanol to Jet A-1. A 50% butanol-loaded blends show a reduction of 29% CO and 24% NOx compared to neat Jet A-1 whereas 30% loading follows a similar trend, and the pollutant emission is slightly higher than the 50% blend case.Additionally, both 30% and 50% butanol blends show a comparable flame temperature distribution, which is higher than neat Jet A-1.

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Response of a swirl-stabilized flame to simultaneous perturbations in equivalence ratio and velocity at high oscillation amplitudes

Cited by 66 publications

References 59 publications

Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

Experimental analysis of thermo-acoustic instabilities in a generic gas turbine combustor by phase-correlated PIV, chemiluminescence, and laser Raman scattering measurements

Autoignition flame dynamics in sequential combustors

Combustion characteristics of butanol‐ Jet A‐1 fuel blends in a swirl‐stabilized combustor under the influence of preheated swirling air

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