A New Wall Motion Actuator Using Magnetic Fluid and Elastic Membrane for Laminar Flow Control

Abstract

A new wall motion actuator for the control of boundary layer flow is presented. The actuator consists of a magnetic fluid layer with an elastic membrane surface and coil system. The vertical motion of the elastic membrane is generated when the magnetic fields are applied to the magnetic fluid. It is possible to control the wall motion by the adjustment of the electric current to the coils. The static and dynamic characteristics of the new actuators have been experimentally investigated. The effectiveness of the actuator for laminar flow control has been shown via wind tunnel testing. Two-dimensional travelling waves, or Tollmien-Schlichting waves (T-S waves), have been effectively attenuated by using the new actuator.

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References

Bushnell, D. M. 1992. "Aircraft Drag Reduction," AGARD Report 786: Special Course on Skin Friction Drag Reduction.

Fukuda, H. , K. Ueno , S. Kamiyama and T. Oyama. 1998. "Study on Active Damper with a Magnetic Fluid," JSME Int. J. Ser B, 41(4):822-829.

Gad-el-Hak, M. 1989. "Flow Control," ASME Appl. Mech. Rev., 42(10):261-293.

Joslin, R. D. , G. Erlebacher and M. Y. Hussaini. 1996. "Active Control of Instabilities in Laminar Boundary Layers-Overview and Concept Validation," ASME, J. Fluids Eng., 118:494-497.

Liepmann, H. W. , G. L. Brown and D. M. Nosenchuck. 1982. "Control of Laminar-instability Waves Using a New Technique," J. Fluid Mech., 118:187-200.

Lin, C. C. 1946. "On the Stability of Two-Dimensional Parallel Flows, Part III. Stability in a Viscous Fluid," Quart. Appl. Math., 3(2):277-301.

Lucey, A. D. and P. W. Carpenter. 1995. "Boundary Layer Instability over Compliant Walls: Comparison between Theory and Experiment," Phys. Fluids, 7(10):2355-2363.

Milling, R. W. 1981. "Tollmien-Schlichting Wave Cancellation," Phys. Fluids, 24(5):979-981.

Nelson, P. A. , M. C. M. Wright and J.-L. Rioual. 1997. "Automatic Control of Laminar Boundary-Layer Transition", AIAA J., 35(1):85-90.

10.

Poll, D. I. A. , S. A. Walsh and M. C. Gallagher. 1996. "On the Effect of Uniform Suction on Stability and Transition in Zero Pressure Gradient Viscous Incompressible Flow," Aeronaut. J., 100(995):143-150.

11.

Thomas, A. S. W. 1983. "The Control of Boundary-Layer Transition Using a Wave-Superposition Principle," J. Fluid Mech., 137:233-250.

12.

Ueno, K. , M. Higashitani and S. Kamiyama . 1995. "Study on Single Bubbles Rising in Magnetic Fluid for Small Weber Number," J. Magn. Magn. Mater, 149:104-107.

13.

Ueno, T. , J. Qiu and J. Tani . 1999. "Principle and Application of New Magnetic Force Control Method Using a Composite Element of Two Active Materials," International Symposium on Non-linear Electromagnetic Systems, Pavia, Italy.

14.

White, F. M. 1986. Fluid Mechanics, 2nd Ed., McGraw-Hill, Inc., 396-404.