External flow velocity and synthetic jets parameters influence on cavity flow structure and acoustics characteristics using RANS/ILES

Lyubimov, D. A.; Fedorenko, A. E.

doi:10.1177/1475472x18763858

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…In addition, k-ω SST turbulence model could be an alternative method after DES model. Similar flow phenomena has also been stated by Lyubimov and Fedorenko 25 in terms of open cavity.…”

Section: Resultssupporting

confidence: 86%

Examination of air flow characteristics over an open rectangular cavity between the plates

Göktepeli

Atmaca

2023

International Journal of Aeroacoustics

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Air flow characteristics of an open cavity have been numerically examined by using different turbulence models of Detached Eddy Simulation (DES), k-ε Realizable, k-ω Shear Stress Transport (SST) and Large Eddy Simulation (LES) based on an experimental study of open literature. Numerical results of transient analyses have been compared to experimental results at cavity length-based Reynolds number of Re = 4600. Pressure distributions, streamline patterns, streamwise velocity components, mean velocity values and their vectors have been given in terms of contour graphics. Moreover, velocity profiles have been presented. Pressure fluctuations have been triggered by flow separation and its reattachment. Due to upstream separation of boundary layer, there was curved boundary layer obtained between the outer potential-flow-like and the recirculation zones. As a result, negative velocity values are evidence for rotational flows affected by formation of secondary flows in the cavity. Furthermore, lower pressure region has been observed as a result of rotational flow which was powerful in the open cavity. Numerical results of DES and LES turbulence models are in good agreement with the results of reference study. As the numerical results obtained by LES turbulence model are approximately same with those of experimental reference study, LES turbulence model is mostly recommended. As an option to these turbulence models, k-ω SST model could be utilized for limited computer capacity. However, k-ε Realizable model is not sufficient for capturing rotational flows which are very effective in terms of present case.

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“…In addition, k-ω SST turbulence model could be an alternative method after DES model. Similar flow phenomena has also been stated by Lyubimov and Fedorenko 25 in terms of open cavity.…”

Section: Resultssupporting

confidence: 86%

Examination of air flow characteristics over an open rectangular cavity between the plates

Göktepeli

Atmaca

2023

International Journal of Aeroacoustics

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“…RANS/ILES high-resolution method 9 was applied in this work. Monotone difference scheme MP9 11 with upwind ninth-order approximation was used to calculate flow parameters on cell faces.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental studies 7,8 showed that SJs may be set in diffuser channels because of their vortex mechanism of action on separation zones. Another RANS/ILES investigation by Lyubimov and Fedorenko 9 showed that SJs are able to reduce pressure pulsations in the cavity. Besides, positive effect on sound pressure level (SPL) characteristics was found.…”

Section: Introductionmentioning

confidence: 99%

Investigation of synthetic jets influence on noise level and its spectral properties for off-design supersonic jet by RANS/ILES method

Benderskiy

Lyubimov

Pol’nyakov

2019

International Journal of Aeroacoustics

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Hybrid Reynolds-Averaged Navier-Stokes/Implicit Large Eddy Simulation (RANS/ILES) highresolution method was applied to investigate synthetic jets influence on potential core length and noise level in supersonic underexpanded jet from converging-diverging nozzle. In this work, temperature and pressure of ambient air were as follows: P ¼ 100 kPa, T ¼ 300 K. Nozzle pressure ratio was NPR ¼ 4 and total temperature at the nozzle inlet was T Ã in ¼ 300 K. Investigation of the accuracy of simulation was carried out before the investigation of synthetic jet influence. Synthetic jets were simulated using approximate boundary condition. Synthetic jets were injected from eight rectangular slits inside nozzle with step of 45 in azimuthal direction. The long sides of the slits were oriented along the longitudinal axis of the nozzle. The amplitude and frequency range of synthetic jets were as follows: q ¼ 50.200 m/s, f ¼ 60.300 Hz. Simulation results showed that the application of synthetic jets noticeably reduces the potential core length. Reducing the potential core length by 24% was achieved on one of the considered operating modes. An explanation for the mechanism of the action of synthetic jets on mixing layer of main jet flow was proposed. Synthetic jets influence on overall sound pressure and narrowband noise was revealed in near and far field. Operating modes, which decrease screech level on several observation angles, were found.

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Improved Delayed Detached-Eddy Investigations on the Flow Control of the Leading-Edge Flat Spoiler of the Cavity in the Low-Aspect-Ratio Aircraft

et al. 2022

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The internal weapon bay is widely used in modern aircraft; however, because the unsteady flows of the cavity would cause dangerous store separation and intense aerodynamic noise, the leading-edge spoiler is an easy and efficient passive flow-control method. The flow control of the leading-edge flat spoiler before the cavity of a low-aspect-ratio flying-wing aircraft is investigated based on numerical simulation. Numerical results show that the leading-edge flat spoiler completely changes the cavity flow; it obviously lifts up the shear layer and reduces the pressure inside the cavity. For the store separation from the weapon bay, the leading-edge flat spoiler is a very good passive flow-control method that curbs the nose-up trend of the store and produces a safe and stable store separation. Besides, the leading-edge spoiler reduces the noise in the rear of the cavity (max 8.2 dB), but increases the noise in the middle of the cavity (max 11.3 dB). In addition, the leading-edge spoiler brings in a large drag increase to the aircraft (39.41% when the height of spoiler is 0.2 m), which would affect the operational stability of the aircraft. The results of this paper could provide a reference for the flow control of weapon bays and the design of aircraft.

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External flow velocity and synthetic jets parameters influence on cavity flow structure and acoustics characteristics using RANS/ILES

Cited by 4 publications

References 14 publications

Examination of air flow characteristics over an open rectangular cavity between the plates

Examination of air flow characteristics over an open rectangular cavity between the plates

Investigation of synthetic jets influence on noise level and its spectral properties for off-design supersonic jet by RANS/ILES method

Improved Delayed Detached-Eddy Investigations on the Flow Control of the Leading-Edge Flat Spoiler of the Cavity in the Low-Aspect-Ratio Aircraft

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