Experimental study on fluidic control of a diffuser: influence of slit geometry

Erik Smid, Hans van Noort, Avraham Hirschberg, Ellen van Emden, Hein de Vries, Herman Stobbe, Guido Zwart, Harry Hoeijmakers

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

Experiments on fluidic control in an asymmetric diffuser are described. For fluidic control, fluid injection through a cross-flow slit placed upstream of the diffuser is applied. Both continuous and oscillating fluid injection is considered. Geometries of slit edges, slit width and partitioning of the slit have been varied. The control strategies combine three elementary processes: momentum injection in the flow direction, removal of the boundary layer by suction and enhancement of turbulent mixing by means of large scale 3-D vortical-flow structures. Momentum injection is only beneficial when the injection velocity is higher than the main flow velocity. In particular velocities of half the main flow velocity turn out to be most detrimental. Suction remains quite efficient even at low velocities. This explains why oscillating flow with low amplitudes is more efficient than flow with moderately high amplitudes. Partitioning of the slit does clearly promote fluidic control by inducing 3-D vortical-flow structures.
Original languageEnglish
Title of host publication47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Subtitle of host publication5-8 January 2009, Orlando, Florida
EditorsRob Vermeland
Place of PublicationReston, VA, USA
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)1-56347-969-9
DOIs
Publication statusPublished - 5 Jan 2009
Event47th AIAA Aerospace Sciences Meeting 2009: including The New Horizons Forum and Aerospace Exposition - Orlando, United States
Duration: 5 Jan 20098 Jan 2009
Conference number: 47

Conference

Conference47th AIAA Aerospace Sciences Meeting 2009
CountryUnited States
CityOrlando
Period5/01/098/01/09

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Fluidics
Geometry
Flow structure
Flow velocity
Momentum
Oscillating flow
Fluids
Boundary layers
Experiments

Cite this

Smid, E., van Noort, H., Hirschberg, A., van Emden, E., de Vries, H., Stobbe, H., ... Hoeijmakers, H. (2009). Experimental study on fluidic control of a diffuser: influence of slit geometry. In R. Vermeland (Ed.), 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition: 5-8 January 2009, Orlando, Florida Reston, VA, USA: American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2009-742
Smid, Erik ; van Noort, Hans ; Hirschberg, Avraham ; van Emden, Ellen ; de Vries, Hein ; Stobbe, Herman ; Zwart, Guido ; Hoeijmakers, Harry. / Experimental study on fluidic control of a diffuser : influence of slit geometry. 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition: 5-8 January 2009, Orlando, Florida. editor / Rob Vermeland. Reston, VA, USA : American Institute of Aeronautics and Astronautics Inc. (AIAA), 2009.
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title = "Experimental study on fluidic control of a diffuser: influence of slit geometry",
abstract = "Experiments on fluidic control in an asymmetric diffuser are described. For fluidic control, fluid injection through a cross-flow slit placed upstream of the diffuser is applied. Both continuous and oscillating fluid injection is considered. Geometries of slit edges, slit width and partitioning of the slit have been varied. The control strategies combine three elementary processes: momentum injection in the flow direction, removal of the boundary layer by suction and enhancement of turbulent mixing by means of large scale 3-D vortical-flow structures. Momentum injection is only beneficial when the injection velocity is higher than the main flow velocity. In particular velocities of half the main flow velocity turn out to be most detrimental. Suction remains quite efficient even at low velocities. This explains why oscillating flow with low amplitudes is more efficient than flow with moderately high amplitudes. Partitioning of the slit does clearly promote fluidic control by inducing 3-D vortical-flow structures.",
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Smid, E, van Noort, H, Hirschberg, A, van Emden, E, de Vries, H, Stobbe, H, Zwart, G & Hoeijmakers, H 2009, Experimental study on fluidic control of a diffuser: influence of slit geometry. in R Vermeland (ed.), 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition: 5-8 January 2009, Orlando, Florida. American Institute of Aeronautics and Astronautics Inc. (AIAA), Reston, VA, USA, 47th AIAA Aerospace Sciences Meeting 2009, Orlando, United States, 5/01/09. https://doi.org/10.2514/6.2009-742

Experimental study on fluidic control of a diffuser : influence of slit geometry. / Smid, Erik; van Noort, Hans; Hirschberg, Avraham; van Emden, Ellen; de Vries, Hein; Stobbe, Herman; Zwart, Guido; Hoeijmakers, Harry.

47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition: 5-8 January 2009, Orlando, Florida. ed. / Rob Vermeland. Reston, VA, USA : American Institute of Aeronautics and Astronautics Inc. (AIAA), 2009.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - Experiments on fluidic control in an asymmetric diffuser are described. For fluidic control, fluid injection through a cross-flow slit placed upstream of the diffuser is applied. Both continuous and oscillating fluid injection is considered. Geometries of slit edges, slit width and partitioning of the slit have been varied. The control strategies combine three elementary processes: momentum injection in the flow direction, removal of the boundary layer by suction and enhancement of turbulent mixing by means of large scale 3-D vortical-flow structures. Momentum injection is only beneficial when the injection velocity is higher than the main flow velocity. In particular velocities of half the main flow velocity turn out to be most detrimental. Suction remains quite efficient even at low velocities. This explains why oscillating flow with low amplitudes is more efficient than flow with moderately high amplitudes. Partitioning of the slit does clearly promote fluidic control by inducing 3-D vortical-flow structures.

AB - Experiments on fluidic control in an asymmetric diffuser are described. For fluidic control, fluid injection through a cross-flow slit placed upstream of the diffuser is applied. Both continuous and oscillating fluid injection is considered. Geometries of slit edges, slit width and partitioning of the slit have been varied. The control strategies combine three elementary processes: momentum injection in the flow direction, removal of the boundary layer by suction and enhancement of turbulent mixing by means of large scale 3-D vortical-flow structures. Momentum injection is only beneficial when the injection velocity is higher than the main flow velocity. In particular velocities of half the main flow velocity turn out to be most detrimental. Suction remains quite efficient even at low velocities. This explains why oscillating flow with low amplitudes is more efficient than flow with moderately high amplitudes. Partitioning of the slit does clearly promote fluidic control by inducing 3-D vortical-flow structures.

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Smid E, van Noort H, Hirschberg A, van Emden E, de Vries H, Stobbe H et al. Experimental study on fluidic control of a diffuser: influence of slit geometry. In Vermeland R, editor, 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition: 5-8 January 2009, Orlando, Florida. Reston, VA, USA: American Institute of Aeronautics and Astronautics Inc. (AIAA). 2009 https://doi.org/10.2514/6.2009-742