Numerical investigation on flow mechanism in a supersonic fluidic oscillator

Sang, Yongjun; Shan, Yongkui; Zhang, Jingzhou; Tan, Xiaoming; Lyu, Yuan-wei

doi:10.1016/j.cja.2020.10.015

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…The issue of blade cooling in hybrid mesh turbomachinery can find non-standard solutions. It is noticeable that special attention is paid to studying the processes of gas jet interaction with a barrier [60] and the Coanda effect [61][62][63]. The use of the Coanda effect is considered a promising method for increasing aircraft lift force [64][65][66].…”

Section: Introductionmentioning

confidence: 99%

Designing Mesh Turbomachinery with the Development of Euler’s Ideas and Investigating Flow Distribution Characteristics

Sazonov

Mokhov²,

Gryaznova³

et al. 2022

Civ Eng J

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This research discusses developing an Euler turbine-based hybrid mesh turbomachinery. Within the framework of mechanical engineering science, turbomachinery classification and a novel method for mesh turbomachinery design were considered. In such a turbomachine, large blades are replaced by a set of smaller blades, which are interconnected to form flow channels in a mesh structure. Previous studies (and reasoning within the framework of inductive and deductive logic) showed that the jet mesh control system allows for operation with several flows simultaneously and provides a pulsed flow regime in flow channels. This provides new opportunities for expanding the control range and reducing the thermal load on the turbomachine blades. The novel method for performance evaluation was confirmed by the calculation: the possibility of implementing pulsed cooling of blades periodically washed by a hot working gas flow (at a temperature of 1000°C) and a cold gas flow (at a temperature of 20°C) was shown. The temperature of the blade walls remained 490–525°C. New results of ongoing research are focused on creating multi-mode turbomachinery that operates in complicated conditions, e.g., in offshore gas fields. Gas energy is lost and dissipated in the throttle at the mouth of each high-pressure well. Within the framework of ongoing research, the environmentally friendly net reservoir energy of high-pressure well gas should be rationally used for operating a booster compressor station. Here, the energy consumption from an external power source can be reduced by 50%, according to preliminary estimates. Doi: 10.28991/CEJ-2022-08-11-017 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Designing Mesh Turbomachinery with the Development of Euler’s Ideas and Investigating Flow Distribution Characteristics

Sazonov

Mokhov²,

Gryaznova³

et al. 2022

Civ Eng J

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“…Tomac and Gregory (2019) used the ability of a pair of phase-synchronized fluidic oscillators to provide synchronised SJs. Recently, Sang et al (2021) made improvements to the geometry of the fluidic oscillator to generate two alternating but independent supersonic jets. This made it possible to speed up the jet by a convergent-divergent nozzle at the output of the oscillator.…”

Section: Introductionmentioning

confidence: 99%

Characterisation and comparison of unsteady actuators: a fluidic oscillator and a sweeping jet

Serrar¹,

Khlifi²,

Kourta

2021

HFF

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Purpose The purpose of this study is to compare two unsteady actuators: an oscillator and a sweeping jet. Both actuators can produce an oscillating jet of different amplitudes and frequencies without any moving parts, making them an attractive actuator concept. The Coanda effect phenomenon can explain the operating principles of these two unsteady actuators. Design/methodology/approach A numerical study was conducted to compare the amplitudes and frequencies of fluidic and sweeping jet (SJ) oscillators to obtain an efficient actuator to control separated flows at high Reynolds numbers. For this goal, two-dimensional unsteady Reynolds-averaged Navier-Stokes simulations were carried out using computational fluid dynamics (CFD) fluent code to evaluate the actuator performances. The discrete fast Fourier transform method determined the oscillation frequencies. Findings The oscillation frequencies gradually increase as the inlet pressure increases. The characteristics and dimensions of the vortices produced in the mixing chamber and feedback loops vary overtime when the injected fluid is swept sideways. The frequencies supplied by the SJ are stronger than those obtained by the fluidic oscillator, which may contribute to improving the aerodynamic performance at a lower power supply cost. Originality/value The existence of the splitter in the fluidic oscillator led to the production of separate pulses, which would be useful in various industrial applications, including active control of combustion and mixing processes while other applications such as flow separation control require SJs. With the latter actuator higher and interesting frequencies can be obtained, leading to efficient flow control.

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Numerical study of the effect of geometric scaling of a fluidic oscillator on the heat transfer and frequency of impinging sweeping jet

Joulaei

Nili-Ahmadabadi

2023

Applied Thermal Engineering

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Numerical investigation on flow mechanism in a supersonic fluidic oscillator

Cited by 8 publications

References 22 publications

Designing Mesh Turbomachinery with the Development of Euler’s Ideas and Investigating Flow Distribution Characteristics

Designing Mesh Turbomachinery with the Development of Euler’s Ideas and Investigating Flow Distribution Characteristics

Characterisation and comparison of unsteady actuators: a fluidic oscillator and a sweeping jet

Numerical study of the effect of geometric scaling of a fluidic oscillator on the heat transfer and frequency of impinging sweeping jet

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