Control of combustion instabilities by local injection of hydrogen

Barbosa, Séverine; García, M. de la Cruz; Ducruix, Sébastien; Labegorre, Bernard; Lacas, F.

doi:10.1016/j.proci.2006.07.085

Cited by 53 publications

(16 citation statements)

References 14 publications

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“…6,7 Damping combustion instabilities is one method to ensure a safe combustor operation. This has been done successfully by active [8][9][10][11][12] or passive 13,14 damping methods. However, since these methods have to be specifically adjusted to a given burner system, it would be preferable to avoid combustion instabilities by an adequate combustor design.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of combustion instabilities in lean swirl-stabilized partially-premixed flames in single- and multiple-burner setup

Kraus

Harth

Bockhorn

2016

International Journal of Spray and Combustion Dynamics

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In the present work, combustion instabilities of a modular combustor are investigated. The combustor operates with partially premixed, swirl-stabilized flames and can be operated in single-and different multiple-burner setups. The design parameters of the combustor prevent large-scale flame-flame interactions in the multiple-burner arrangements. The objective is to investigate how the interaction of the swirl jets affects the thermoacoustic stability of the combustor. Results of measurements of pressure oscillations and high-speed OH*-chemiluminescence imaging for the single-burner setup and two multiple-burner setups are discussed. Additionally, results of investigations with different flame characteristics are presented. These are achieved by varying the ratio of the mass flow rates through the swirlers of the doubleconcentric swirl nozzle. Several unstable modes with high pressure amplitudes are observed in the single-burner setup as well as in the multiple-burner setups. Numerical studies of the acoustic behavior of the combustor setups were performed that indicate that the different geometries show similar acoustic behaviors. The results lead to the conclusion that the interaction of the swirl jets in the multiple-burner setups affects the thermoacoustic response spectrum of the flame even in the absence of large-scale flame-flame interactions. Based on the findings in earlier studies, it is concluded that the differences in the flame response characteristics are induced by the reduction of the swirl intensity in the multiple-burner arrangements, which is caused by the exchange of momentum between the adjacent swirl jets.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of combustion instabilities in lean swirl-stabilized partially-premixed flames in single- and multiple-burner setup

Kraus

Harth

Bockhorn

2016

International Journal of Spray and Combustion Dynamics

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“…H2 addition increases the lean operation limits, reducing the risk of flame blow-off, and has been observed in previous studies to improve flame ignitability and stability, as well as reduce pressure and heat release perturbations [14,[29][30][31][32][33][34][35][36][37]. Barbosa et al [35] investigated the effect of injecting hydrogen in a lean premixed propaneair flame on the combustion oscillations. The authors reported a significant reduction in the amplitude of pressure oscillations but a negligible change in the heat release oscillations, which was attributed to the injected hydrogen decoupling the acoustic and heat release oscillations.…”

Section: Introductionmentioning

confidence: 93%

Investigating the effect of local addition of hydrogen to acoustically excited ethylene and methane flames

Hussain

Talibi

Balachandran

2019

International Journal of Hydrogen Energy

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While lean combustion in gas turbines is known to reduce NOx, it makes combustors more prone to thermo-acoustic instabilities, which can lead to deterioration in engine performance. The work presented in this study investigates the effectiveness of secondary injection of hydrogen to imperfectly premixed methane and ethylene flames in reducing heat release oscillations. Both acoustically forced and unforced flames were studied, and simultaneous OH and H atom PLIF (planar laser induced fluorescence) was conducted. The tests were carried out on a laboratory scale bluff-body combustor with a central V-shaped bluff body. Two-microphone method was used to estimate velocity perturbations from pressure measurements, flame boundary images were captured using high speed Mie scattering, while global heat release fluctuations were determined from OH* chemiluminescence. The results showed that hydrogen addition considerably reduced heat release oscillations for both methane and ethylene flames at all the forcing frequencies tested, with the exception of methane flames forced at 315 Hz, where oscillations increased with hydrogen addition. The addition of hydrogen reduced the extent of flame roll-up for both methane and ethylene flames, however, this reduction was larger for methane flames. NOx exhaust emissions were observed to increase with hydrogen addition for both methane and ethylene flames, with absolute NOx concentrations higher for ethylene flames, due to higher flame temperatures.

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“…Examples of actuators used to achieve these physical property changes (note that these same actuators can be and are used in the closed-loop studies as well) include valves that oscillate the air (or fuel) fl ow rate into the combustor (e.g., Bloxsidge et al, 1988;Tuncer et al, 2005;Uhm and Acharya, 2004), speakers that excite acoustic oscillations with desired phase and amplitude within the combustor (e.g., Paschereit et al, 1999), synthetic jet actuators (Ritchie et al, 2000) that introduce vortical features at the small scale to enhance mixing, and secondary or primary fuel injection manipulations (e.g., Auer et al, 2005;Barbosa et al, 2007;Cohen and Rey, 1999;Cohen et al, 2001;Ghoniem et al, 2005;Gutmark et al, 1998;Hathout et al, 2002;Jones et al, 1999;Kim et al, 2000;Lal et al, 2003aLal et al, , 2004Lang et al, 1987;Langhorne et al, 1990;Richards et al, 1999;Yi and Gutmark, 2007a, b;Yu and Wilson, 2002;Yu et al, 1996;Zinn and Neumeier, 1997) that modulate the injection rate of all or a fraction of the supplied fuel. As this reference list suggests, controlling the fuel fl ow rate or modulating the fuel (primary or secondary) has become a major area of ACS for combustion control since this approach directly targets the source of combustion.…”

Section: Experimental Studies Of Control Of Combustion Instabilitymentioning

confidence: 99%

Fundamentals and Applications of Modern Flow Control

Joslin¹,

Miller²,

Miller³

2009

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Control of combustion instabilities by local injection of hydrogen

Cited by 53 publications

References 14 publications

Experimental investigation of combustion instabilities in lean swirl-stabilized partially-premixed flames in single- and multiple-burner setup

Experimental investigation of combustion instabilities in lean swirl-stabilized partially-premixed flames in single- and multiple-burner setup

Investigating the effect of local addition of hydrogen to acoustically excited ethylene and methane flames

Fundamentals and Applications of Modern Flow Control

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