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Influence of outlet geometry on strongly swirling turbulent flow through a circular tube
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10.1063/1.2400075
/content/aip/journal/pof2/18/12/10.1063/1.2400075
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/12/10.1063/1.2400075

Figures

Image of FIG. 1.
FIG. 1.

Basic layout of swirl generator and pipe assembly with details of the swirl generator and the double-elbow outlet (all dimensions in mm).

Image of FIG. 2.
FIG. 2.

Visualization of low-swirl vortex breakdown for , , and .

Image of FIG. 3.
FIG. 3.

Dependence of Reynolds number for vortex breakdown on geometric swirl number and orifice:pipe diameter ratio . LDA measurements were carried out for parameter combinations corresponding to the symbols (●) and (∎).

Image of FIG. 4.
FIG. 4.

Streamline patterns with axial-velocity profiles superimposed (a) , fully open outlet; (b) , outlet contraction. (◆) denotes zero axial velocity, (∎) a stagnation point, and () .

Image of FIG. 5.
FIG. 5.

(a) Radial distributions of mean swirl velocity and swirl-velocity fluctuations at all locations from for low swirl, , fully open outlet. (b) Radial distributions of mean swirl velocity and swirl-velocity fluctuations at all locations for low swirl, , concentric outlet contraction.

Image of FIG. 6.
FIG. 6.

(a) Radial distributions of mean axial velocity and axial-velocity fluctuations at locations, , fully open outlet. (b) Radial distributions of mean axial velocity and axial-velocity fluctuations, , concentric outlet contraction.

Image of FIG. 7.
FIG. 7.

Streamline patterns constructed from axial-velocity distributions with axial-velocity profiles superimposed: (a) , fully open outlet; (b) , outlet contraction. (◆) denotes zero axial velocity; (∎) a stagnation point, and () .

Image of FIG. 8.
FIG. 8.

(a) Radial distributions of mean swirl velocity and swirl-velocity fluctuations for high swirl , fully open outlet. (b) Radial distributions of mean swirl velocity and swirl-velocity fluctuations for high swirl , concentric outlet contraction.

Image of FIG. 9.
FIG. 9.

(a) Radial distributions of mean axial velocity and axial-velocity fluctuations for high swirl , fully open outlet. (b) Radial distributions of mean axial velocity and axial-velocity fluctuations for high swirl , concentric outlet contraction.

Image of FIG. 10.
FIG. 10.

Path of vortex core for high swirl for (a) eccentric contraction and (b) annular outlet contraction.

Image of FIG. 11.
FIG. 11.

(a) Radial distributions of mean swirl velocity for high swirl , eccentric contraction and for concentric outlet. (b) Radial distributions of mean axial velocity for high swirl , eccentric contraction and for concentric outlet. (c) Radial distributions of mean swirl velocity and swirl-velocity fluctuations for high swirl , eccentric outlet contraction. (d) Radial distributions of mean axial velocity and axial-velocity fluctuations for high swirl , eccentric outlet contraction.

Image of FIG. 12.
FIG. 12.

(a) Radial distributions of mean swirl velocity for high swirl , annular outlet contraction and for fully open outlet. (b) Radial distributions of mean axial velocity for high swirl , annular outlet contraction and for fully open outlet. (c) Radial distributions of mean swirl velocity and swirl-velocity fluctuations for high swirl , annular outlet contraction. (d) Radial distributions of mean axial velocity and axial-velocity fluctuations for high swirl , annular outlet contraction.

Image of FIG. 13.
FIG. 13.

(a) Radial distributions of mean swirl velocity for high swirl , double 90° elbow outlet, and fully open outlet. (b) Radial distributions of mean axial velocity for high swirl , double 90° elbow outlet, and fully open outlet. (c) Radial distributions of mean swirl velocity and swirl-velocity fluctuations for high swirl , double 90° elbow outlet. (d) Radial distributions of mean axial velocity and axial-velocity fluctuations for high swirl , double 90° elbow outlet.

Image of FIG. 14.
FIG. 14.

Method used to determine the position of the vortex core.

Tables

Generic image for table
Table I.

Flow parameters for LDA measurements.

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/content/aip/journal/pof2/18/12/10.1063/1.2400075
2006-12-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of outlet geometry on strongly swirling turbulent flow through a circular tube
http://aip.metastore.ingenta.com/content/aip/journal/pof2/18/12/10.1063/1.2400075
10.1063/1.2400075
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