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

doi:10.2514/6.2009-742

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 proceeding › Conference contribution › Academic › peer-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 language	English
Title of host publication	47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Subtitle of host publication	5-8 January 2009, Orlando, Florida
Editors	Rob Vermeland
Place of Publication	Reston, VA, USA
Publisher	American Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)	1-56347-969-9
DOIs	https://doi.org/10.2514/6.2009-742
Publication status	Published - 5 Jan 2009
Event	47th AIAA Aerospace Sciences Meeting 2009: including The New Horizons Forum and Aerospace Exposition - Orlando, United States Duration: 5 Jan 2009 → 8 Jan 2009 Conference number: 47

Conference

Conference	47th AIAA Aerospace Sciences Meeting 2009
Country	United States
City	Orlando
Period	5/01/09 → 8/01/09

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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.",

author = "Erik Smid and {van Noort}, Hans and Avraham Hirschberg and {van Emden}, Ellen and {de Vries}, Hein and Herman Stobbe and Guido Zwart and Harry Hoeijmakers",

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doi = "10.2514/6.2009-742",

language = "English",

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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 proceeding › Conference contribution › Academic › peer-review

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AU - Smid, Erik

AU - van Noort, Hans

AU - Hirschberg, Avraham

AU - van Emden, Ellen

AU - de Vries, Hein

AU - Stobbe, Herman

AU - Zwart, Guido

AU - Hoeijmakers, Harry

PY - 2009/1/5

Y1 - 2009/1/5

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.

U2 - 10.2514/6.2009-742

DO - 10.2514/6.2009-742

M3 - Conference contribution

SN - 1-56347-969-9

BT - 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

A2 - Vermeland, Rob

PB - American Institute of Aeronautics and Astronautics Inc. (AIAA)

CY - Reston, VA, USA

ER -

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