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Experimental study of highly turbulent isothermal opposed-jet flows
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10.1063/1.3484253
/content/aip/journal/pof2/22/10/10.1063/1.3484253
http://aip.metastore.ingenta.com/content/aip/journal/pof2/22/10/10.1063/1.3484253
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the opposed-jet assembly.

Image of FIG. 2.
FIG. 2.

Phase plot of velocity components at different axial locations along the centerline. Triangles: ; circles: ; squares: . The reference location at corresponds to the mean stagnation plane and the negative sign indicates locations between the mean stagnation plane and the bottom nozzle. Case NN (a); case TN (b); case TB (c).

Image of FIG. 3.
FIG. 3.

(a) Radial profiles of mean axial and radial velocity components (TB case) at different distances from the mean stagnation plane assumed as . Circles: ; squares: ; triangles: . (b) rms values along the burner centerline.

Image of FIG. 4.
FIG. 4.

Percentage of the total turbulent kinetic energy vs POD mode (TB case).

Image of FIG. 5.
FIG. 5.

Vector representations of modes 1 (a) and 2 (b) for case TB. Snapshots of the vector field reconstructed with only modes 0 and 1 (c and d). Snapshots of the vector field reconstructed with only modes 0 and 2 (e and f). TB case. Vector fields are undersampled for readability.

Image of FIG. 6.
FIG. 6.

Phase plot of the POD coefficients, and , relative to mode 1 (abscissa) and mode 2 (ordinate), respectively. TB case.

Image of FIG. 7.
FIG. 7.

Snapshot of the velocity field, represented by the velocity vectors. Superimposed are the flow sectional streamlines originating from the top nozzle and from the bottom nozzle (thin lines). The thick gray line is stagnation line, the white circles are nodes/foci, and the black circles are stagnation points.

Image of FIG. 8.
FIG. 8.

Instantaneous sectional streamlines superimposed to vector field in the presence of strong three-dimensional effects. Superimposed are the flow sectional streamlines originating from the top nozzle and from the bottom nozzle (thin lines). The thick gray line is stagnation line, the white circles are nodes/foci, and the black circles are stagnation points.

Image of FIG. 9.
FIG. 9.

Histograms of the intercept of the stagnation line with the centerline for the three cases: NN, no plate (plain line), TN, plate in top burner (dashed line), and TB plate on both sides (dotted line).

Image of FIG. 10.
FIG. 10.

Coordinate system for conditional statistics showing (a) the mean stagnation streamline and its intersection with the instantaneous stagnation line and (b) three instantaneous realizations of the stagnation lines, some velocity vectors tangent to the stagnation line and their components along x and z, u and v, respectively.

Image of FIG. 11.
FIG. 11.

Comparison of the three data analyses. Axial (a) and radial (b) velocity fluctuations along the centerline (burner axis): nonconditional statistics (solid black), POD (dotted gray), and SLCS (dashed black).

Image of FIG. 12.
FIG. 12.

Comparison of the three data analyses for the radial profiles of axial and radial velocity fluctuations. [(a) and (b)] Radial profiles at different distances from the mean stagnation line assumed as . Circles: ; squares: ; triangles: . (a) Nonconditional statistics. (b) POD filtered statistics. (c) Conditional statistics (gray) vs nonconditional statistics (black) along the stagnation line. Circles: axial velocity fluctuation; triangles: radial velocity fluctuations.

Image of FIG. 13.
FIG. 13.

Comparison of the three data analyses for the axial profiles for the nonconditional (plain line), POD (dotted line), and conditional (dashed line) estimates of the longitudinal integral scale (a), transversal Taylor scale (b), integral scale based Reynolds number (c), and Taylor scale based Reynolds number (d).

Image of FIG. 14.
FIG. 14.

Profiles of axial and radial velocity gradients along the stagnation line. (a) Nonconditional statistics. (b) POD filtered statistics. (c) Conditional mean and rms velocity gradient.

Image of FIG. 15.
FIG. 15.

Profiles of axial and radial velocity gradients along the stagnation streamline. (a) Nonconditional statistics. (b) POD filtered statistics. (c) Conditional mean and rms velocity gradient.

Image of FIG. 16.
FIG. 16.

Coordinate system for local conditional statistics. (a) One instantaneous realization of the stagnation line, two stagnation points, the stagnation point local sectional streamlines, and vortex. (b) Local stagnation line, local stagnation streamline, the stagnation point local sectional streamlines (thin lines), stagnation point (black circle), local coordinate system (s,n), and respective direction vectors (black).

Image of FIG. 17.
FIG. 17.

Axial and radial velocity rms profiles along the local instantaneous stagnation line (a) and local instantaneous stagnation streamline (b).

Image of FIG. 18.
FIG. 18.

Velocity gradients along the local instantaneous stagnation line (a) and local instantaneous stagnation streamline (b).

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/content/aip/journal/pof2/22/10/10.1063/1.3484253
2010-10-14
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental study of highly turbulent isothermal opposed-jet flows
http://aip.metastore.ingenta.com/content/aip/journal/pof2/22/10/10.1063/1.3484253
10.1063/1.3484253
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