Control of Fin Shock Induced Flow Separation Using Vortex Generators

Pickles, Joshua D.; Narayanaswamy, Venkateswaran

doi:10.2514/1.j059624

Cited by 13 publications

(2 citation statements)

References 33 publications

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“…There have been relatively fewer investigations of 3D-SBLI control; however, some recent appraisals provide a guide for future activity. Both passive and active efforts to date appear to require that the actuator be placed relatively close to the interaction for effectiveness; results using VGs on a fin-on-cylinder, swept SBLI demonstrate this effectively (Pickles & Narayanaswamy 2020). This approach may introduce immense challenges when flow conditions change at offdesign conditions.…”

Section: Flow Controlmentioning

confidence: 99%

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Gaitonde

Adler

2023

Annu. Rev. Fluid Mech.

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Advances in measuring and understanding separated, nominally two-dimensional (2D) shock-wave/turbulent-boundary-layer interactions (STBLI) have triggered recent campaigns focused on three-dimensional (3D) STBLI, which display far greater configuration diversity. Nonetheless, unifying properties emerge for semi-infinite interactions, taking the form of conical asymptotic behavior where shock-generator specifics become insignificant. The contrast between 2D and 3D separation is substantial; the skewed vortical structure of 3D STBLI reflects the essentially 2D influence of the boundary layer on the 3D character of the swept shock. As with 2D STBLI, conical interactions engender prominent spectral content below that of the turbulent boundary layer. However, the uniform separation length scale, which is crucial to normalizing the lowest-frequency dynamics in 2D STBLI, is absent. Comparatively, the spectra of 3D STBLI are more representative of the mid-frequency, convective, shear-layer dynamics in 2D, while phenomena associated with 2D separation-shock breathing are muted. Asymptotic behavior breaks down in many regions important to 3D-STBLI dynamics, occurring in a configuration-dependent manner. Aspects of inceptive regions near shock generators and symmetry planes are reviewed. Focused efforts toward 3D modal and nonmodal analyses, moving-shock/boundary-layer interactions, fluid/structure interactions, and flow control are suggested as directions for future work. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Flow Controlmentioning

confidence: 99%

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Gaitonde

Adler

2023

Annu. Rev. Fluid Mech.

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“…Recent studies (e.g. Funderburk & Narayanaswamy 2019; Pickles & Narayanaswamy 2020) indicate that vortex-generator control that energizes the boundary layer is much less effective in three-dimensional (3-D) SWBLI. However, the few works investigating the control of 3-D separation considered either mechanical vortex generators or jets injected normal to the surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow

Sebastian

Schreyer

2022

J. Fluid Mech.

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In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24 $^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups.

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Methodology to image the panel surface pressure power spectra in weakly coupled fluid/structure interactions

Varigonda

Narayanaswamy

2021

Exp Fluids

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Control of Fin Shock Induced Flow Separation Using Vortex Generators

Cited by 13 publications

References 33 publications

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow

Methodology to image the panel surface pressure power spectra in weakly coupled fluid/structure interactions

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