Experimental Study on Lifted Flames Operated with Liquid Kerosene at Elevated Pressure and Stabilized by Outer Recirculation

Kasabov, Plamen; Zarzalis, Nikolaos; Habisreuther, Peter

doi:10.1007/s10494-013-9444-1

Cited by 15 publications

(15 citation statements)

References 16 publications

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“…[ 11] studied lifted flames at pressures up to 6 bar and observed that the lift-off height decreases with pressures up to 6 bar. However, the configuration used by Kasabov et al [ 11] featured preheating, swirl, and a confinement, rendering the data not readily comparable to other studies dealing with more canonical configurations.…”

Section: Introductionmentioning

confidence: 78%

“…Studies of lifted flames at pressures different than atmospheric are scarce [ 11,12,13] but highly relevant given that most practical combustors operate at elevated pressure and flames become lifted either by design or induced by instability [ 14]. Wang et al [ 12] reported that the lift-off height is sensitive to pressure but only sub-atmospheric pressure conditions were examined.…”

Section: Introductionmentioning

confidence: 99%

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Pressure effects and transition in the stabilization mechanism of turbulent lifted flames

Guiberti

Boyette

Roberts

et al. 2019

Proceedings of the Combustion Institute

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This study reports novel measurements on the effects of pressure on the lift-off behavior and the stabilization mechanism of turbulent non-premixed methane jet flames. A high-pressure combustion duct (HPCD) was operated within the range of pressure P = to 7 bar using jet velocities of 4 m.s-1  Uj  30 m.s-1 and co-flow velocities of 0.23 m.s-1  Uc  0.60 m.s-1. Lift-off heights were measured from chemiluminescence pictures while joint images of hydroxyl and velocity, performed using joint PLIF-OH/PIV, were used to extract information about the stabilization mechanism. It is shown that while the lift-off height generally increases with pressure, the impact of pressure depends on the magnitude of the co-flow velocity. For Uc = 0.30 m.s-1 , the flame's base remains near the nozzle over the entire pressure range and the measured flame speeds indicate that edge-flame stabilization is dominant. The slope of the lift-off height vs jet velocity curves is positive. For Uc = 0.60 m.s-1 and P > 2 bar, the flame stabilizes further downstream and a transition to turbulent premixed flame propagation appears to have occurred. At these conditions, the slope of the lift-off height vs jet velocity curves becomes negative. This reversal at high pressure is a new result for methane. More importantly, the transition in the stabilization mechanism with increasing Uc is consistent with results reported earlier for ethylene and appears to be independent of the fuel.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Pressure effects and transition in the stabilization mechanism of turbulent lifted flames

Guiberti

Boyette

Roberts

et al. 2019

Proceedings of the Combustion Institute

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“…A schematic representation of the low-swirl burner test rig investigated at KIT is reported in Figure 1: this concept has been investigated in different works in the last years [15][16][17]). In the current paper the latest investigations carried out by Sedlmaier and coworkers is taken as reference [16,18].…”

Section: Test Case: Kit Low-swirl Burner Description Of Investigated Geometrymentioning

confidence: 99%

“…In this study, the lift-off height is defined as the location at which the intensity of chemiluminescence reaches the 10% of the entire reaction zone light intensity. This definition is preferred since it takes into account the hot main reaction zone, while simply considering hot combustion product concentration might be misleading due to the recirculation field near the nozzle exit [17].…”

Section: Experimental Findingsmentioning

confidence: 99%

“…The most interesting practical implementations of lean burn lifted flames for GT applications are those based on low-swirl partially premixed mixtures studied by [12][13][14] and more recently by the Engler-Bunte Institut (EBI) at the Karlsruher Institut für Technologie (KIT) [15,16], where the extension to spray flames has been also investigated [17,18]. The use of low-swirl conditions for the main mixture flow allows to promote fuel-air mixing and to induce a controlled jet expansion which produces a velocity field where the flame front could be stabilized at a certain distance from the burner exit.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling of Gaseous Partially Premixed Low-Swirl Lifted Flame at Elevated Pressure

Langone

Sedlmaier

Nassini

et al. 2020

Volume 4B: Combustion, Fuels, and Emissions

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Lifted flames have been investigated in the past years for their benefits in terms of NOx emissions reduction for gas turbine applications. In a lifted flame, the flame front stabilized on a position that is significantly detached from the nozzle exit, improving the premixing process before the reaction zone. The distance between the flame front and the nozzle exit is called lift-off height and it represents the main parameter that characterize this type of flame. In the present work, a partially premixed lifted flame employing air-methane mixture is investigated through numerical simulation. Indeed, even if lifted jet flames have been widely studied in the literature, there are only a few examples of lifted partially premixed flames. Nevertheless, this kind of flames assumes an important role considering the current gas turbine applications, since their benefits in terms of stability and low pollutant emissions. This study has been performed with LES calculations using a commercial software suite and the numerical results are compared with experimental data coming from a dedicated campaign held at Karlsruher Institute für Technologie (KIT) on a novel low-swirl injector nozzle. Quenching effects due to strain, curvature and heat loss have been introduced into the combustion model thanks to a correction of the source term in the progress variable equation within the FGM model. The comparison between numerical results and experimental data have been performed in terms of lift-off height and OH* chemiluminescence maps, showing the capability to properly predict the overall flow and to catch flame lift-off even if with an underpredicted height. This points out promising capability of the numerical model in the representation of lifted flames, allowing further investigations of the flame structure otherwise not available from experimental techniques.

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Enhancement of Blowout Limits in Lifted Swirled Flames in Methane-Air Combustor by the Use of Sinusoidally Driven Plasma Discharges

Giorgi

Bonuso

Mehdi

et al. 2021

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Experimental Study on Lifted Flames Operated with Liquid Kerosene at Elevated Pressure and Stabilized by Outer Recirculation

Cited by 15 publications

References 16 publications

Pressure effects and transition in the stabilization mechanism of turbulent lifted flames

Pressure effects and transition in the stabilization mechanism of turbulent lifted flames

Numerical Modeling of Gaseous Partially Premixed Low-Swirl Lifted Flame at Elevated Pressure

Enhancement of Blowout Limits in Lifted Swirled Flames in Methane-Air Combustor by the Use of Sinusoidally Driven Plasma Discharges

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