Flame Propagation in Swirling Flows—effect of Local Extinction on the Combustion Induced Vortex Breakdown

Kröner, Martin; Sattelmayer, Thomas; Fritz, Jassin; Kiesewetter, Frank; Hirsch, Christoph

doi:10.1080/00102200601149902

Cited by 42 publications

(23 citation statements)

References 24 publications

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“…Multiple physical processes, including vorticity generation [38][39][40][41][42][43]49], aerodynamically induced back pressure [27,28,44], flame wall interactions [16][17][18][19][20][21], coherent structures [47,48], flame stretch and heat release fluctuations [42,45] have been identified as highly influential effects. The configuration analysed in the experimental part of this paper, features flashback in the core flow and also involves strong flame wall interaction [47,48,51].…”

Section: Discussionmentioning

confidence: 99%

“…Further experimental validation was provided by Konle et al [38] by implementing highspeed PIV and LIF techniques. Investigation of CIVB processes was, then, extended to the interplays between turbulence and chemistry [40,42]. It should be also noted that there exist some numerical evidence indicated that flame stretch and heat release and also reorientation of vorticity filament could be of significance in CIVB [41,44].…”

Section: Introductionmentioning

confidence: 98%

“…Vortex breakdown in reactive flows has been investigated in a number of works [36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Karimi

McGrath

Brown

et al. 2016

Flow Turbulence Combust

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Circumferential upstream propagation of a premixed flame in a region confined between two concentric tubes is considered. The cold flow in this configuration features rotational motion and the flame is modelled as an interface separating the burned and unburned gases. Through an analytical solution of the integral form of the governing equations, it is shown that the static pressure increases across the flame. Hence, the circumferential propagation of the flame is associated with the generation of an adverse pressure gradient. The theoretical prediction of the pressure increase is, further, supported by the experimental observations and discussed in the context of the theory of flame back pressure. The results extend the recent findings on the generation of adverse pressure gradient during the axial propagation of swirling flames, to the circumferential direction. It is argued that the demonstrated pressure gain across the flame can significantly facilitate flame flashback.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Karimi

McGrath

Brown

et al. 2016

Flow Turbulence Combust

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“…To reduce NO x emissions by enhanced premixing of fuel and air, new burner concepts introduce a mixing zone downstream of the point of swirl generation and fuel injection and upstream of the combustion chamber. A danger in the application of this concept is the flame propagation into the mixing zone [5,6]. In the presented work, two types of axial flashback into a mixing tube are studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of flow field scaling on flashback of swirl flames

Blesinger

Koch

Bauer

2010

Experimental Thermal and Fluid Science

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“…According to Kröner and Konle et al [5][6][7][8], swirl-premixed burner systems are mostly prone to CIVB flashback for natural gas fuel. However, in the latest investigation [9,10], it has been found that boundary layer flashback is another dominant failure mechanism for hydrogen fuel besides CIVB flashback.…”

Section: Introductionmentioning

confidence: 99%

CIVB flashback analysis of hydrogen flame based on azimuthal vorticity at mixing zone exit

Xiao

ShuangXi

YuFeng

et al. 2014

Sci. China Technol. Sci.

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Swirl-premixed combustion systems exhibit potential to meet future regulations on pollution emissions. However, combustion induced vortex breakdown (CIVB) flashback is frequently observed in these systems, especially for high hydrogen content fuel. In this study, a swirl-premixed burner with diverging centerbody was used to investigate CIVB flashback based on azimuthal vorticity at mixing zone exit. Through 2D axisymmetric model, it was found that there was a maximal azimuthal vorticity at mixing zone exit for each equivalence ratio. The physical meaning of these maximal azimuthal vorticity values was the minimally required azimuthal vorticity to trigger CIVB flashback. At the same time, the required azimuthal vorticity declined with the increase of equivalence ratio since turbulent burning velocity started to control flashback. Nevertheless, azimuthal vorticity offered by heat release increased with the increase of equivalence ratio, which promoted flame propagating upstream continually. azimuthal vorticity, mixing zone exit, premixed hydrogen flame, CIVB flashback Citation: Tian X J, Xing S X, Cui Y F, et al. CIVB flashback analysis of hydrogen flame based on azimuthal vorticity at mixing zone exit.

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Flame Propagation in Swirling Flows—effect of Local Extinction on the Combustion Induced Vortex Breakdown

Cited by 42 publications

References 24 publications

Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Influence of flow field scaling on flashback of swirl flames

CIVB flashback analysis of hydrogen flame based on azimuthal vorticity at mixing zone exit

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