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Effects of conical lids on vortex breakdown in an enclosed cylindrical chamber
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10.1063/1.2387107
/content/aip/journal/pof2/18/11/10.1063/1.2387107
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/11/10.1063/1.2387107
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the chamber with the (a) flat lid, (b) concave-cone lid, and (c) convex-cone lid.

Image of FIG. 2.
FIG. 2.

Example of the computational mesh.

Image of FIG. 3.
FIG. 3.

Comparison between numerical results and experimental results by Escudier for the case of the whole end wall rotating.

Image of FIG. 4.
FIG. 4.

Contours of streamlines and angular momentum in the meridional plane for , and (a) flat lid, (b) concave lid with , and (c) concave lid with . The contour levels are nonuniformly spaced, with 20 positive and 20 negative levels determined by and .

Image of FIG. 5.
FIG. 5.

The swirling velocity and pressure distributions along the axis for at different ; the top of the axis is defined as the pressure reference point, where the pressure is set to zero.

Image of FIG. 6.
FIG. 6.

Contours of streamlines and angular momentum in the meridional plane for , and (a) flat lid, (b) convex lid with , and (c) convex lid with . The contour levels are nonuniformly spaced, with 20 positive and 20 negative levels determined by and .

Image of FIG. 7.
FIG. 7.

Contours of streamlines in the meridional plane for and convex lid with the height ratio and as indicated. The contour levels are nonuniformly spaced, with 20 positive and 20 negative levels determined by and .

Image of FIG. 8.
FIG. 8.

The swirling velocity and pressure distributions along the axis for at different ; the top of the axis is defined as the pressure reference point, where the pressure is set to zero.

Image of FIG. 9.
FIG. 9.

Contours of streamlines and angular momentum in the meridional plane in the chamber with spherical-cap lids at , (a) a concave lid with , ; (b) a convex lid with , .

Image of FIG. 10.
FIG. 10.

Onset of vortex breakdown for the swirling flow in the chamber with the different lids in the parameter plane (, ) and as indicated.

Image of FIG. 11.
FIG. 11.

The critical aspect ratio for the first onset of vortex breakdown as a function of .

Image of FIG. 12.
FIG. 12.

Onset of vortex breakdown for the swirling flow in the chamber with the different lids in the parameter plane (, ) and as indicated.

Image of FIG. 13.
FIG. 13.

Onset of vortex breakdown with variation height ratio .

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/content/aip/journal/pof2/18/11/10.1063/1.2387107
2006-11-03
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of conical lids on vortex breakdown in an enclosed cylindrical chamber
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/11/10.1063/1.2387107
10.1063/1.2387107
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