On the Operational Characteristics of a Multi-annular Swirl Burner

Gupta, A. K.; Béer, J.M.; Swithenbank, J.

doi:10.1080/00102207808946830

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…As a predominant flow mechanism found both in premixed and nonpremixed practical combustion systems, swirl provides an effective means to control flame stability as well as the combustion intensity. [10][11][12][13][14] For premixed combustion, the recirculation zone generated by the sufficiently intense swirling motion plays an important role in the flame stabilization process, as it retains a steady supply of radicals and hot combustion products to continuously ignite the fresh reactants. Flame stabilization also benefits from the generation of a compact swirling flame with much higher combustion intensity than in a non-swirling case.…”

Section: -2mentioning

confidence: 99%

Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor

Han¹,

Cai²,

Wang³

et al. 2014

Chinese Phys. B

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Numerically-aided experimental studies are conducted on a swirl-stabilized combustor to investigate the dilution effects on flame stability, flame structure, and pollutant emissions of premixed CH 4 /air flames. Our goal is to provide a systematic assessment on combustion characteristics in diluted regimes for its application to environmentally-friendly approaches such as biogas combustion and exhaust-gas recirculation technology. Two main diluting species, N 2 and CO 2 , are tested at various dilution rates. The results obtained by means of optical diagnostics show that five main flame regimes can be observed for N 2 -diluted flames by changing excess air and dilution rate. CO 2 -diluted flames follow the same pattern evolution except that all the domains are shifted to lower excess air. Both N 2 and CO 2 dilution affect the lean blowout (LBO) limits negatively. This behavior can be counter-balanced by reactant preheating which is able to broaden the flammability domain of the diluted flames. Flame reactivity is degraded by increasing dilution rate. Meanwhile, flames are thickened in the presence of both diluting species. NO x emissions are significantly reduced with dilution and proved to be relevant to flame stability diagrams: slight augmentation in NO x emission profiles is related to transitional flame states where instability occurs. Although dilution results in increase in CO emissions at certain levels, optimal dilution rates can still be proposed to achieve an ideal compromise.

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Section: -2mentioning

confidence: 99%

Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor

Han¹,

Cai²,

Wang³

et al. 2014

Chinese Phys. B

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“…Swirling jet flow is the result of an impartation of a tangential or azimuthal velocity component by use of a swirl generator positioned upstream of the reactor or expansion chamber. Various modes of generation have been utilized to accomplish this task [1] : (1) guide vanes, (2) tangential entry swirler, (3) rotating honeycomb [10] or thick perforated disc, (4) high-speed rotation of a pipe [9] , and the multi-annular swirler [2] . Swirl of sufficient strength will produce a large adverse pressure gradient in the direction of flow, which will promote a reverse of flow or vortex breakdown.…”

Section: Introductionmentioning

confidence: 99%

Development of fully 3-D numerical model for cross-field swirling flow simulation

Leu

2008

Journal of Information and Optimization Sciences

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Swirling flow plays an important role in many engineering applications. Its function not only can increase the fuel/air mixing effect, but also can create a recirculation region in the downstream to stabilize the flame. Since the geometry of the boiler is irregular and with several wall-burners, a fully 3-D numerical model for flow field simulation is required. For validation, the axi-symmetric swirling flow field is first calculated and used to compare with Lilley's measured date. Next, the confinement geometry is changed from round to rectangle and the injection area ratio is varied to study the recirculation flow behavior. In the following, the effect of four swirling flow injection interactions on the whole flow field structure will be discussed. The results show that the case with single entry the rectangular boundary creates a secondary flow and squeezing the recirculation zone to force it stretches. The degree of squeezing depends upon the expansion area ratio. However, the results with four entries show that the shape of recirculation zone of each burner is strongly dependent on the whole cross-field structure. In addition, the interactions of four swirl jets result in the formation of a central recirculation zone. The degree of the effect is strongly related to the inlet swirl strength.

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“…Nevertheless, we would recommend extreme caution in the use of the «-e model in highly swirling flows [3].…”

mentioning

confidence: 99%

Discussion: “Flow Aerodynamics Modeling of an MHD Swirl Combustor: Calculations and Experimental Verification” (Gupta, A. K., Bee´r, J. M., Louis, J. F., Busnaina, A. A., and Lilley, D. G., 1982, ASME J. Fluids Eng., 104, pp. 385–391)

Boysan

Swithenbank

1982

Journal of Fluids Engineering

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On the Operational Characteristics of a Multi-annular Swirl Burner

Cited by 8 publications

References 3 publications

Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor

Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor

Development of fully 3-D numerical model for cross-field swirling flow simulation

Discussion: “Flow Aerodynamics Modeling of an MHD Swirl Combustor: Calculations and Experimental Verification” (Gupta, A. K., Bee´r, J. M., Louis, J. F., Busnaina, A. A., and Lilley, D. G., 1982, ASME J. Fluids Eng., 104, pp. 385–391)

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On the Operational Characteristics of a Multi-annular Swirl Burner

Cited by 8 publications

References 3 publications

Flow characterization and dilution effects of N 2 and CO 2 on premixed CH 4 /air flames in a swirl-stabilized combustor

Flow characterization and dilution effects of N 2 and CO 2 on premixed CH 4 /air flames in a swirl-stabilized combustor

Development of fully 3-D numerical model for cross-field swirling flow simulation

Discussion: “Flow Aerodynamics Modeling of an MHD Swirl Combustor: Calculations and Experimental Verification” (Gupta, A. K., Bee´r, J. M., Louis, J. F., Busnaina, A. A., and Lilley, D. G., 1982, ASME J. Fluids Eng., 104, pp. 385–391)

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Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor

Flow characterization and dilution effects of N ₂ and CO ₂ on premixed CH ₄ /air flames in a swirl-stabilized combustor