Parametric Study of Alternating Flow Patterns in Non-Reacting Multiple-Swirl Flows

Dolan, Brian; Gomez, Rodrigo Villalva; Gutmark, Ephraim

doi:10.1007/s10494-017-9856-4

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…The performance of the multi-swirl LDI combustor depends on numerous design factors, such as the quantity and dimensions of injector elements, the type of air swirler (radial or axial), the design of the swirler (number of swirl vanes, swirler angle, and direction) and the type of fuel nozzle. Experiments and simulations were carried out to compare the effect of these variables on combustor performance in terms of flame stability, NOx, and CO emissions [26][27][28][29][30]. The effect of spacing between the swirlers on the flow field is studied by Kao et al [26] for a linear array of five nozzles.…”

Section: Introductionmentioning

confidence: 99%

“…They reported a large degree of unsteadiness due to highly turbulent flow close to the combustion chamber inlet. Dolan et al [28] involved non-reacting RANS simulations on a two-nozzle configuration. They noted the presence of alternating flow patterns in relation to the nozzle exit flare angles of 105 degrees (corresponding to a swirl number of 0.79) and 120 degrees (corresponding to swirl numbers of 0.69 and 0.79).…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Flow, Combustion and Emission Characteristics of Novel Multi-Swirl LDI burners.

Perikathra,

Mahalingam

2024

Preprint

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Academic investigations and development have been directed towards exploring alternatives that can enhance aircraft engines' efficiency while minimizing emissions. We have developed two novel multi-swirl LDI burners, named LDI-3AB and LDI-4C, for low-emission aero propulsion systems, which consists of numerous lean direct injection modules with distributed fuel injection surrounded by airflow through hexagonal swirlers with a 45° vane angle. This study presents an experimental and numerical analysis of these burners' flow, combustion and emission characteristics under various operating conditions. Numerical analysis is carried out using the URANS with the realizable \(\kappa\)-\(\varepsilon\) turbulence model in combination with the FGM combustion model, and it is compared against the results of stereo PIV data. The numerical results correlated well with the experimental data, and all simulations accurately captured the flow patterns. The comparative study showed that LDI-4C exhibits vigorous mixing activity, which gives low mixture fraction values throughout the combustor length compared to the LDI-3AB burner. This is because the cross-fuel injection effectively distributes the fuel to the shear layer of the swirling air stream and helps in quick mixing. The LDI-4C always has a lower \(NO_{x}\) value at the exit of the combustion chamber than LDI-3AB due to low temperature and residence time and it has high \(CO_{2}\) production, and more \(O_{2}\) consumption indicates better combustion efficiency than the LDI-3AB burner.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Flow, Combustion and Emission Characteristics of Novel Multi-Swirl LDI burners.

Perikathra,

Mahalingam

2024

Preprint

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Experimental assessment of the lean blow-off in a fully premixed annular combustor

Ciardiello

Skiba

Gordon

et al. 2020

Experimental Thermal and Fluid Science

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The behaviour of the flame in an annular combustor with multiple bluff-body injectors with swirl was investigated to provide insights into lean blow-off (LBO) mechanisms when flames interact. Two different configurations, with 12 and 18 burners, and various bulk velocities and equivalence ratios were tested. Flame shape and main features were studied by means of 5 kHz OH * chemiluminescence imaging and the stability limits were identified and compiled into stability regime diagrams. As the equivalence ratio of the mixture was reduced the individual flames would first exhibit a transition from a stable "W-shape" state to a stable "V-shape" state before becoming unstable close to extinction. In the 18-burner configuration LBO was characterised by random detachment and re-stabilisation of the flames over multiple burners across the chamber, until complete lift-off. In the 12-burner configuration the flame anchors on a few burners in azimuthally symmetric locations, making the overall flame less prone to global extinction. Finally, the stability curves were computed using a correlation based on the Damkhöler (Da) number and compared to single burner configurations. The beginning of the blow-off transient was found to be similar to the LBO condition for a single burner in the 12-burner setup, while the 18-burner configuration was less stable for all the conditions investigated. However, it was found that correlations based on single burner extinction data do not fully work for the extinction of interacting flames. The results provide insights into the blow-off of realistic gas turbine engines and can be used for validating models of such processes.

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Injector-injector interactions on the flow field, spray characteristics, and subsequent flame pattern in an annular combustor

Wei

Yang

et al. 2022

International Journal of Heat and Fluid Flow

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Parametric Study of Alternating Flow Patterns in Non-Reacting Multiple-Swirl Flows

Cited by 7 publications

References 30 publications

Experimental and Numerical Investigation of Flow, Combustion and Emission Characteristics of Novel Multi-Swirl LDI burners.

Experimental and Numerical Investigation of Flow, Combustion and Emission Characteristics of Novel Multi-Swirl LDI burners.

Experimental assessment of the lean blow-off in a fully premixed annular combustor

Injector-injector interactions on the flow field, spray characteristics, and subsequent flame pattern in an annular combustor

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