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Control of a fluid particle under simulated deep-ocean conditions in a high-pressure water tunnel
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10.1063/1.1854216
/content/aip/journal/rsi/76/2/10.1063/1.1854216
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/2/10.1063/1.1854216
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

HWT showing a positively buoyant object.

Image of FIG. 2.
FIG. 2.

HWT at NETL.

Image of FIG. 3.
FIG. 3.

drop in the test section of the HWT at simulated ocean conditions of , depth.

Image of FIG. 4.
FIG. 4.

Diagram of a particle suspended in the test section along with geometric parameters used to derive the equation of motion. Dimensions of the test section, used in the experimental setup, are as follows. Full height: . Radius at : . Diverging angle: .

Image of FIG. 5.
FIG. 5.

Velocity profiles at the cross section of the test section obtained by automatic traversing Pitot tube for the range of flow rates .

Image of FIG. 6.
FIG. 6.

Nondimensional drag force, , for a spherical particle as a function of Reynolds number and its linearization around the setpoint velocity .

Image of FIG. 7.
FIG. 7.

Open-loop impulse response of the linearized equation of motion for a buoyant spherical particle in countercurrent fluid flow in a diverging pipe.

Image of FIG. 8.
FIG. 8.

Axial flow velocity at as a function of the flow rate in the system.

Image of FIG. 9.
FIG. 9.

Open- (solid line) and closed-loop (dashed line) responses (PID gains: , , ).

Image of FIG. 10.
FIG. 10.

Response of system given by Eq. (24) with delay and noise to the step (top), impulse (middle), and square wave (period ) (bottom) perturbations for the two different control gain sets shown.

Image of FIG. 11.
FIG. 11.

Square wave (period ) response of system given by Eq. (24) with delay and noise (PID controller gains: , , ).

Image of FIG. 12.
FIG. 12.

Long-term drop behavior: (a) Open loop and (b) with PID control .

Image of FIG. 13.
FIG. 13.

Short-term drop behavior: (a) Open loop and (b) with PID control .

Image of FIG. 14.
FIG. 14.

drop response to square wave: (a) Open loop and (b) with PID control .

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/content/aip/journal/rsi/76/2/10.1063/1.1854216
2005-01-21
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Control of a fluid particle under simulated deep-ocean conditions in a high-pressure water tunnel
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/2/10.1063/1.1854216
10.1063/1.1854216
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