Optical Diagnostics Applied to a Gas Turbine Pilot Burner

Seyfried, Hans; Brackmann, Christian; Lindholm, Annika; Linne, Mark; Aldén, Marcus; Barreras, Félix; Bank, Ralf von der

doi:10.2514/1.30032

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…1 General features of LPP combustion deduced from the measurements given next: a) flow and flame patterns, which appear to be complicated, but the relevant physics reduce to that of (b) and b) the shear layer that contains the premixed main flame, in which most of the fuel burns. [1,2] Yes No PLIF, PIV, 4.5 atm, Jet-A Seyfried et al [3] No Yes PLIF, 3.2 atm, kerosene, pilot only Meier et al [4] No Yes PLIF, 6 atm, kerosene LPP liquid fuel computations --------LP (i.e., gaseous fuel) flowfield measurements Stopper et al [9] Yes Yes PLIF, PIV, 6.0 atm, preheated Cheng et al [10], Johnson et al [11], and Littlejohn and Cheng [12] Yes No PIV, 8 atm, preheated…”

Section: Concept Of Lean Premixed Prevaporized Combustionmentioning

confidence: 99%

“…The present work is one of the first to apply both PIV and PLIF to an LPP combustor. Seyfreid et al [3] recorded the PLIF signal from kerosene vapor in an LPP device to identify where the liquid fuel was vaporizing. Meier et al [4] imaged OH to mark the flame locations in a kerosene-fueled staged combustor that had main and pilot flames and is similar to an LPP device.…”

Section: Concept Of Lean Premixed Prevaporized Combustionmentioning

confidence: 99%

“…T HERE have been relatively few previous studies of lean premixed prevaporized (LPP) combustors that have provided images of the locations of flames, shear layers and recirculation zones [1][2][3][4]. Such measurements are needed to explain why LPP can to lead to significant reductions in NOx emissions [5][6][7][8] and to find ways to reduce the combustion instabilities that also can occur [5].…”

Section: Introductionmentioning

confidence: 99%

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Unsteady Aspects of Lean Premixed Prevaporized Gas Turbine Combustors: Flame-Flame Interactions

Dhanuka

Temme

Driscoll

2011

Journal of Propulsion and Power

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This work quantifies several sources of unsteadiness that exist within a lean premixed prevaporized gas turbine combustor that was operated at elevated pressures using Jet-A fuel. Flame-flame interactions and shear layer vortex shedding, which can be sources of combustion instabilities, are quantified with particle image velocimetry and planar laser-induced fluorescence diagnostics. Flame-flame interactions occur because lean premixed prevaporized aircraft combustors employ a premixed main flame, which is anchored by the nonpremixed pilot flame. The measured degree of unsteadiness is the standard deviation of flame surface density, flame length, vorticity in shear layer, and recirculation zone size. The flame surface density profile was broad, indicating that large flame motions occur. Flame length increases nonlinearly with fuel flow rate. Intense vortices in the shear layer are more than twice the average vorticity, indicating the need for unsteady modeling. Chamber pressure and liquid fuel flow rates were varied. Velocity fields for the five reacting cases were similar, but they differed from the two nonreacting cases. Heat release causes the recirculation zone shape to change from ellipsoidal (for the reacting cases) to toroidal (for the nonreacting cases). Methods were developed to image Jet-A spray flames at 3 atm using formaldehyde fluorescence.

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Section: Concept Of Lean Premixed Prevaporized Combustionmentioning

confidence: 99%

Section: Concept Of Lean Premixed Prevaporized Combustionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unsteady Aspects of Lean Premixed Prevaporized Gas Turbine Combustors: Flame-Flame Interactions

Dhanuka

Temme

Driscoll

2011

Journal of Propulsion and Power

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“…There have been relatively few previous studies of lean premixed, prevaporized (LPP) combustors that have provided images of the locations of flames, shear layers and recirculation zones [1][2][3][4]. ________________________________________ operation most of the fuel is burned in a premixed flame (called the Main flame) that is anchored by a smaller non-premixed Pilot flame.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Aspects of Lean Premixed-Prevaporized (LPP) Gas Turbine Combustors: Flame-Flame Interactions

Dhanuka

Temme

Driscoll

et al. 2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This work quantifies several sources of unsteadiness that exist within a Lean Premixed-Prevaporized (LPP) gas turbine combustor that was operated at elevated pressures using Jet-A fuel. Flame-flame interactions and shear layer vortex shedding, which can be sources of combustion instabilities, are quantified with PIV and PLIF diagnostics. Flame-flame interactions occur because LPP aircraft combustors employ a premixed Main flame that is anchored by the non-premixed Pilot flame. The measured degree of unsteadiness is the standard deviation of: a) flame surface density, b) flame length, c) vorticity in shear layer, and d) recirculation zone size. The flame surface density profile was broad, indicating that large flame motions occur. Flame length increases non-linearly with fuel flowrate. Intense vortices in the shear layer are more than twice the average vorticity, indicating the need for unsteady modeling. Chamber pressure and liquid fuel flow rates were varied. Velocity fields for the five reacting cases were similar but they differed from the two non-reacting cases. Heat release causes the recirculation zone shape to change from ellipsoidal (for the reacting cases) to toroidal (for the non-reacting cases). Methods were developed to image Jet-A spray flames at 3 atm. using formaldehyde fluorescence.

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An experimental study on the spray characteristics of the air-blast atomizer

Dong

et al. 2015

Applied Thermal Engineering

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Optical Diagnostics Applied to a Gas Turbine Pilot Burner

Cited by 11 publications

References 10 publications

Unsteady Aspects of Lean Premixed Prevaporized Gas Turbine Combustors: Flame-Flame Interactions

Unsteady Aspects of Lean Premixed Prevaporized Gas Turbine Combustors: Flame-Flame Interactions

Unsteady Aspects of Lean Premixed-Prevaporized (LPP) Gas Turbine Combustors: Flame-Flame Interactions

An experimental study on the spray characteristics of the air-blast atomizer

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