Image processing for the characterization of flame stability in a non-premixed liquid fuel burner near lean blowout

Giorgi, Maria Grazia De; Sciolti, Aldebara; Campilongo, Stefano; Ficarella, Antonio

doi:10.1016/j.ast.2015.11.030

Cited by 50 publications

(12 citation statements)

References 26 publications

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“…The data were acquired during experiments that were carried out at the Green Engine laboratory of the University of Salento in Lecce – Italy, where a 300 kW liquid-fuelled swirling combustor was used in a non-premixed mode [2] , [3] . The sketch of the overall experimental apparatus is shown in Fig.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental data regarding the effects of urea addition into liquid fuel to combustion enhancement of a low NOx gas turbine combustor

et al. 2021

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental data regarding the effects of urea addition into liquid fuel to combustion enhancement of a low NOx gas turbine combustor

et al. 2021

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“…Hence, temperature contour can be used as a marker for flame identification in numerical studies. As far as flame identification in real life is concerned, high-speed visualisation systems involving CCDs in the visible spectrum (VIS, 400-700 nm) are particularly suitable to determine flame shape, brightness and oscillation frequency, which are related to combustion efficiency and flame stability (38) . The acquisition of flame signature in visible region is easier and cheaper, especially for real aero engine combustors which offer limited optical access for experimentation.…”

Section: Flame Identification and Estimation Methodologymentioning

confidence: 99%

Flame volume prediction and validation for lean blow-out of gas turbine combustor

Ahmed

Huang

2017

Aeronaut. j.

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Lean Blow-Out (LBO) limits are critically important in the operation of aero engines. Previously, Lefebvre's LBO empirical correlation has been extended to the flame volume concept by the authors. Flame volume takes into account the effects of geometric configuration, spatial interaction of mixing jets, turbulence, heat transfer and combustion processes inside the gas turbine combustion chamber. For these reasons, LBO predictions based on flame volume are more accurate. Although LBO prediction accuracy has improved, it poses a challenge associated with Vfestimation in real gas turbine combustors. This work extends the approach of flame volume prediction based on fuel iterative approximation with cold flow simulations to reactive flow simulations. Flame volume for 11 combustor configurations were simulated and validated against experimental data. To make prediction methodology robust, as required in preliminary design stage, reactive flow simulations were carried out with the combination of presumed Probability Density Function (PDF) and discrete phase model (DPM) in Fluent 15.0 The criterion for flame identification was defined. Two important parameters—critical injection diameter (Dp,crit) and critical temperature (Tcrit)—were identified and their influence on reactive flow simulation was studied for Vfestimation. Results exhibit ±15% error in Vf estimation with experimental data.

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“…A liquid-fueled gas-turbine derived combustor (modified for laboratory investigations with a thermal power of 300 kW) was used for experimental purposes; the burner [27,28], shown in Figure 1, is located at the Green Engine Laboratory of the University of Salento (Lecce, Italy). The cylindrical combustion chamber has an axial dimension of 29 cm and a diameter of 14 cm.…”

Section: Combustor Facility and Flame Conditionsmentioning

confidence: 99%

Pollutant Formation during the Occurrence of Flame Instabilities under Very-Lean Combustion Conditions in a Liquid-Fuel Burner

et al. 2017

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Recent advances in gas turbine combustor design are aimed at achieving low exhaust emissions, hence modern aircraft jet engines are designed with lean-burn combustion systems. In the present work, we report an experimental study on lean combustion in a liquid fuel burner, operated under a non-premixed (single point injection) regime that mimics the combustion in a modern aircraft engine. The flame behavior was investigated in proximity of the blow-out limit by an intensified high rate Charge-Coupled Device (CCD) camera equipped with different optical filters to selectively record single species chemiluminescence emissions (e.g., OH*, CH*). Analogous filters were also used in combination with photomultiplier (PMT) tubes. Furthermore this work investigates well-mixed lean low NO x combustion where mixing is good and generation of solid carbon particulate emissions should be very low. An analysis of pollutants such as fine particles and gaseous emissions was also performed. Particle number concentrations and size distributions were measured at the exhaust of the combustion chamber by two different particle size measuring instruments: a scanning mobility particle sizer (SMPS) and an Electrical Low Pressure Impactor (ELPI). NO x concentration measurements were performed by using a cross-flow modulation chemiluminescence detection system; CO concentration emissions were acquired with a Cross-flow modulation Non-dispersive infrared (NDIR) absorption method. All the measurements were completed by diagnostics of the fundamental combustor parameters. The results herein presented show that at very-lean conditions the emissions of both particulate matter and CO was found to increase most likely due to the occurrence of flame instabilities while the NO x were observed to reduce.

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Image processing for the characterization of flame stability in a non-premixed liquid fuel burner near lean blowout

Cited by 50 publications

References 26 publications

Experimental data regarding the effects of urea addition into liquid fuel to combustion enhancement of a low NOx gas turbine combustor

Experimental data regarding the effects of urea addition into liquid fuel to combustion enhancement of a low NOx gas turbine combustor

Flame volume prediction and validation for lean blow-out of gas turbine combustor

Pollutant Formation during the Occurrence of Flame Instabilities under Very-Lean Combustion Conditions in a Liquid-Fuel Burner

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