Influence of jet parameters of fluidic oscillator-type fuel injector on the mixing performance in a supersonic flow field

Lee, Sangyoon; Roh, Tae‐Seong; Lee, Hyoung Jin

doi:10.1016/j.ast.2023.108154

Cited by 8 publications

(2 citation statements)

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“…In recent years, many researchers have been working on the analysis, design, and applications of FOs. For instance, Lee et al [29], performed a numerical study of the influence of jet parameters of fluidic oscillator-type fuel injector on the mixing performance in a supersonic flow field. Their results showed that the influence of the sweeping jet angle on the mixing performance is more notable than that of the oscillating frequency, and they concluded that an appropriate combination of the frequency and sweeping jet angle is needed to maximize the mixing performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications

Karimzadegan,

Mirzaei,

Bergada

2024

Applied Sciences

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To activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection, and the momentum coefficient, need to be tuned. Presently, two main devices are capable of injecting pulsating flow with a momentum coefficient sufficient to delay the boundary layer separation: these are zero-net-mass-flow Actuators (ZNMFAs) and fluidic oscillators (FOs). In the present study, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, and fluid is considered to be incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effects of dimensional modifications on outlet width and mixing chamber wedge inclination angle are addressed. Modifications of the outlet width were observed to create large variations in FO performance. The origin of self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact, we can conclude by saying that the current FO configuration is pressure-driven, although the mass flow forces appear to be much more relevant than in previously studied FO configurations.

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Section: Introductionmentioning

confidence: 99%

Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications

Karimzadegan,

Mirzaei,

Bergada

2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…In recent years many researchers have been working on analysis, design, and applications of FO's. For instance, Lee et al [29], performed a numerical study of the influence of jet parameters of fluidic oscillator-type fuel injector on the mixing performance in a supersonic flow field. Their results showed that the influence of the sweeping jet angle on the mixing performance is more notable than that of the oscillating frequency and they concluded that an appropriate combination of the frequency and sweeping jet angle to maximize the mixing performance is needed.…”

Section: Introductionmentioning

confidence: 99%

Fluidic Oscillator Performance under Several Mixing Chamber Dimensional Modifications

Karimzadegan,

Mirzaei,

Bergadà

2024

Preprint

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In Active Flow Control (AFC) applications, to activate the boundary layer the use of pulsating flow has notorious energy advantages versus constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection and momentum coefficient need to be tuned. Two main devices are nowadays capable of injecting pulsating flow with the sufficient momentum coefficient to delay the boundary layer separation, these are the Zero Net Mass Flow actuators (ZNMFA) and the Fluidic Oscillators (FO). In the present research, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, fluid is considered as incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effect of outlet width and mixing chamber wedge inclination angle dimensional modifications is addressed, modifications of the outlet width are observed to create large variations on the FO performance. The origin of the self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact we can conclude saying that the current FO configuration is pressure driven although the mass flow forces appear to be a much more relevant than in previous FO configurations studied.

show abstract