Experimental Characterization of an Isothermal Swirler Flowfield

Woodmansee, M. A.; Ball, Irven C.; Barlow, K.W.

doi:10.2514/1.19105

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Laser-based tools offer the potential to measure most of the important quantities necessary to gain a deeper insight into complex chemical and physical processes in turbulent flames. The flow field can be measured by Laser Doppler Velocimetry (LDV) or Particle Imaging Velocimetry (PIV) (Ji and Gore, 2002;Mueller et al, 1998;Woodmansee et al, 2007), mixing process and flame structure by Planar Laser-Induced Fluorescence (PLIF), while laser Raman scattering permits to determine the major species concentrations, temperature, and mixture fraction. Up to now, due to laser technology limitations, these information were usually sampled with a repetition rate of an average of 10 Hz (except for LDV), giving combustion statistical quantities that significantly helped in understanding turbulent flames.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

Barbosa,

Scouflaire,

Ducruix

2008

Preprint

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The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of gas turbine combustors. This analysis is carried out using High Frequency PIV (HFPIV) measurements in a reactive situation. While this information is usually available at a rather low rate, temporally resolved PIV measurements are necessary to better understand highly turbulent swirled flows, which are unsteady by nature. Thanks to recent technical improvements, a PIV system working at 12 kHz has been developed to study this experimental combustor flow field. Statistical quantities of the burner are first obtained and analyzed, and the measurement quality is checked, then a temporal analysis of the velocity field is carried out, indicating that large coherent structures periodically appear in the combustion chamber. The frequency of these structures is very close to the quarter wave mode of the chamber, giving a possible explanation for combustion instability coupling. The frequency of these structures is very close to the quarter wave mode of the chamber, giving a possible explanation for combustion instabilities coupling.

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Section: Introductionmentioning

confidence: 99%

Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

Barbosa,

Scouflaire,

Ducruix

2008

Preprint

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Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature

Liu

Qian

Xue

et al. 2019

Journal of Thermal Science and Engineering Applications

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Large eddy simulation (LES) of nonreacting turbulent flow in a multiswirler model combustor is carried out at elevated pressure and high temperature. Flow interaction between the main stage and the pilot stage is discussed based on the time-averaged and instantaneous flowfield. Flow dynamics in the multiswirling flow are analyzed using a phase-averaged method. Proper orthogonal decomposition (POD) is used to extract dominant flow features in the multiswirling flow. Numerical results show that the main stage and the pilot stage flows interact with each other generating a complex flowfield. Flow interaction can be divided into three regions: converging region, merging region, and combined region. A precessing vortex core (PVC) is successfully captured in the pilot stage. PVC rotates with a first dominant frequency of 2756 Hz inducing asymmetric azimuthal flow instabilities in the pilot stage. POD analyses for the velocity fields also show dominant high-frequency modes (mode 1 and mode 2) in the pilot stage. However, the dominant energetic flow is damped rapidly downstream of the pilot stage such that it has a little effect on the main stage flow.

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Flow Dynamics in a Multiswirler Model Combustor Based on Large Eddy Simulation and Proper Orthogonal Decomposition Analysis

Liu

Wang

Qian

et al. 2019

Journal of Engineering for Gas Turbines and Power

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Swirling flow is often employed in gas turbine combustion chambers for the sake of improving flame stability. Swirling flow induces not only recirculation zones but also large coherent structures, which show close relationship with flow dynamics and combustion instability. The flow dynamics including precessing vortex core (PVC) in simple swirlers is extensively studied, while the flow instability characteristics in a multiswirler combustor are not fully reported. In this paper, large eddy simulation (LES) of nonreacting turbulent swirling flow is conducted in a multiswirler burner, which comprises a pilot stage and a main stage. Flow dynamics in the multiswirler combustor are analyzed based on phase-averaged evolution of instantaneous flowfield. LES results are compared with particle image velocimetry (PIV) data in terms of mean and root mean square (RMS) velocities. Proper orthogonal decomposition (POD) is employed to identify the coherent structures in the multiswirling flow. Results show that LES results are in good agreement with particle image velocimetry (PIV) data. Main stage and pilot stage flow interact with each other generating highly turbulent swirling flow. PVC is successfully captured at the boundary of main recirculation zone (MRZ) in the pilot stage with a dominant frequency of 1915 Hz. The PVC leads to periodic azimuthal flow instability. POD analyses for the velocity fields show dominant high-frequency modes (modes 1 and 2) in the pilot stage. However, the dominant energetic flow is damped rapidly downstream of the pilot stage that it has little effect on the main stage flow.

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Experimental Characterization of an Isothermal Swirler Flowfield

Cited by 3 publications

References 15 publications

Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV

Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature

Flow Dynamics in a Multiswirler Model Combustor Based on Large Eddy Simulation and Proper Orthogonal Decomposition Analysis

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