An experimental study on a coaxial flow with inner swirl: Vortex evolution and flow field mixing attributes

Giannadakis, Athanasios; Naxakis, Andreas; Romeos, Alexandros; Perrakis, Konstantinos

doi:10.1016/j.ast.2019.105373

Cited by 12 publications

(1 citation statement)

References 41 publications

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“…The essence of PIV measurement is to characterize the flow structure by acquiring the flow characteristics of the tracer particles. Stokes number (Stk) is introduced as the criterion for selecting tracer particles [32]. Stk is the ratio of particle relaxation time to fluid characteristic time, which represents the ratio of particle inertia and diffusion.…”

Section: Combustor Model and Experiments Systemmentioning

confidence: 99%

Experimental Investigation on Flame Chemiluminescence and Flow Characteristics of a Reverse-Flow Combustor

et al. 2022

International Journal of Aerospace Engineering

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The reverse-flow combustor is extensively applied in small engines due to its compact structure. The cold-state flow characteristics, the ignition process, and flame chemiluminescence characteristics of the reserve-flow combustor were investigated experimentally. Using the particle imaging velocimeter, the cold-state time-averaged flow fields at three different total pressure loss coefficients ζ B are examined. The ignition processes of the combustor, as well as flame characteristics during stable combustion at different equivalent ratios φ , are analyzed based on flame chemiluminescence imaging when ζ B is 3%. As ζ B increases from 1% to 5%, the flow field of the combustor remains almost unchanged while the flow velocity increases. For ζ B =3%, the ignition time T drops from 26 ms to 16 ms with an increase of φ . In addition, the ignition performance is enhanced. Proportions of the T2 phase (quasi-stable phase) are 73%, 68%, and 66%, respectively, suggesting that the quasi-stable phase is the key to successful ignition. As φ increases, the flame becomes thinner and shorter. Furthermore, standard deviations of continuous image areas of CH ∗ and OH ∗ drop from 0.0143 and 0.0132 to 0.0115 and 0.0109, respectively, which indicates the enhancement of combustion stability. According to the brightness distributions of CH ∗ and OH ∗ along the axial direction of the combustor at different equivalent ratios, the production of OH ∗ is significantly affected by the temperature. It can be adopted as an important sign of heat release during combustion.

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Section: Combustor Model and Experiments Systemmentioning

confidence: 99%

Experimental Investigation on Flame Chemiluminescence and Flow Characteristics of a Reverse-Flow Combustor

et al. 2022

International Journal of Aerospace Engineering

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Experimental investigation of flow field characteristics in a mixed-flow trapped vortex combustor

Jiang

2020

Aerospace Science and Technology

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Performance of a novel mixed-flow trapped vortex combustor for turboshaft engine

Jiang

2020

Aerospace Science and Technology

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An experimental study on a coaxial flow with inner swirl: Vortex evolution and flow field mixing attributes

Cited by 12 publications

References 41 publications

Experimental Investigation on Flame Chemiluminescence and Flow Characteristics of a Reverse-Flow Combustor

Experimental Investigation on Flame Chemiluminescence and Flow Characteristics of a Reverse-Flow Combustor

Experimental investigation of flow field characteristics in a mixed-flow trapped vortex combustor

Performance of a novel mixed-flow trapped vortex combustor for turboshaft engine

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