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Experimental study of the formation and scaling of a round synthetic jet
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10.1063/1.2711481
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Affiliations:
1 Department of Mechanical Engineering, University of Wyoming, Laramie, Wyoming 82071
a) Also at: Enabling Technology and Research, Boeing Commercial Airplanes, Seattle, WA 98124.
Phys. Fluids 19, 045109 (2007)
/content/aip/journal/pof2/19/4/10.1063/1.2711481
http://aip.metastore.ingenta.com/content/aip/journal/pof2/19/4/10.1063/1.2711481

## Figures

FIG. 1.

Experimental setup of piston-cylinder synthetic jet actuator in water tank.

FIG. 2.

Dye flow visualization images at three values of and . Note that the field of view increases with increasing stroke. (a) , (b) , (c)

FIG. 3.

Dye flow visualization images at three values of and various values of . (a) , , ; (b) , , ; (c) , ,

FIG. 4.

Transition map for vortex rings formed in the synthetic jet: , laminar; , transitional; , turbulent.

FIG. 5.

Dye flow visualization images at three values of and . (a) , (b) , (c)

FIG. 6.

Phase-averaged azimuthal vorticity contours, , showing the location of the vortex ring formed during the expulsion portion of the actuator cycle. Two phase angles (162°, 342°) at three values of are shown; . The contour interval, , is . (a) & (d) , (b) & (e) , (c) & (f)

FIG. 7.

Phase-averaged azimuthal vorticity contours, , comparing the vortex rings for two values of the actuator Reynolds number; , . The contour interval, , is . (a) , (b)

FIG. 8.

Cross-stream profiles of the streamwise component of the velocity at the orifice for , 2.0, and 3.0; . (a) , (b) , (c)

FIG. 9.

A comparison of azimuthal vorticity contours and flow-field velocity vectors at and 3.0, . The contour interval, , is . (a)–(c) , (d)–(f)

FIG. 10.

A comparison of cross-stream profiles of the streamwise component of the velocity at the orifice for two values of , . (a) , (b)

FIG. 11.

The time evolution of the vortex ring diameter during one period of the actuator cycle, . : , 1.0; , 2.0; , 3.0.

FIG. 12.

The time evolution of the vortex ring diameter during one period of the actuator cycle, and 3.0. : , 1000; , 2500; , 5000; , 10000. (a) , (b)

FIG. 13.

The time evolution of the vortex ring trajectory for one period of the actuator cycle, .

FIG. 14.

The time evolution of the vortex ring trajectory for one period of the actuator cycle, .

FIG. 15.

Isocontours of the streamfunction, , derived from the time-averaged flow field for , 2.0, and 3.0; . The contour interval, , is 0.014. (a) , (b) , (c)

FIG. 16.

Isocontours of the streamfunction, , derived from the time-averaged flow field for , 5000, and 10000; . The contour interval, , is 0.014. (a) , (b) , (c)

FIG. 17.

A comparison of cross-stream profiles of the streamwise velocity for differing values of at . For clarity, the profiles for have been shifted along the axis by successive increments of 0.5. : , 1.0; , 2.0; , 3.0.

FIG. 18.

A comparison of cross-stream profiles of the streamwise velocity for differing values of at . For clarity, the profiles for have been shifted along the axis by successive increments of 0.5. : , 2500; , 5000; , 10000.

FIG. 19.

The streamwise variation in the mean jet centerline velocity, . : , 1.0; , 2.0; , 3.0.

FIG. 20.

The streamwise variation in the mean jet centerline velocity for , 2.0, and 3.0. : , 1000; , 2500; , 5000; , 10000. (a) , (b) , (c)

FIG. 21.

The streamwise variation in the mean jet width, . : , 1.0; , 2.0; , 3.0.

FIG. 22.

The streamwise variation in the mean jet width for and 3.0. : , 1000; , 2500; , 5000; , 10000. (a) , (b)

FIG. 23.

The streamwise variation in cross-stream profiles of the longitudinal turbulence intensity at . : , 2.0; , 3.0; , 4.0; , 7.0; , 9.5. (a) , (b) , (c)

FIG. 24.

The streamwise variation in cross-stream profiles of the transverse turbulence intensity at . : , 2.0; , 3.0; , 4.0; , 7.0; , 9.5. (a) , (b) , (c)

FIG. 25.

The streamwise variation in cross-stream profiles of the turbulence intensities at . : , 2.0; , 3.0. : 2.5, open symbols, 3.0, closed symbols.

FIG. 26.

Correlations of the longitudinal velocity component, . : 1.0, solid; 2.0, dashed; 3.0, dash-dot-dot; 5.0, dotted. (a) , (b)

FIG. 27.

The streamwise variation in the mean jet momentum at , 2.0, and 3.0. : , 1000; , 2500; , 5000; , 10000. (a) , (b) , (c)

## Tables

Table I.

The normalized, remaining, net flow rate determined from phase-averaged orifice velocity profiles at .

Table II.

A comparison of the theoretical and the actual , , and .

/content/aip/journal/pof2/19/4/10.1063/1.2711481
2007-04-27
2014-04-17

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