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Interactive Control of Wall Structures by MEMS-Based Transducers

  • Chih-Ming Ho
  • Steve Tung
  • Yu-Chong Tai
Part of the Fluid Mechanics and its Applications book series (FMIA, volume 36)

Abstract

In turbulent boundary layers, the near-wall streamwise vortices contribute to a significant part of the turbulence production. Successful control of the streamwise vortices can lead to the desirable skin-friction drag reduction. In the past, passive devices such as longitudinal riblets were used to achieve a 6% reduction (Bruse et al. 1993). Recent numerical simulations (Choi et al. 1994) indicate that an active control scheme based on surface shear-stress measurements can increase the drag reduction to almost 30%. We are currently developing a large-scale integrated systems of micromachined sensors, micromachined actuators, and neural network VLSI circuits for interactive control of the wall structures. The newly developed MEMS technology allows us to, for the first time, fabricate micro sensors and actuators that can match both the temporal and spatial resolutions of the wall structures (Ho and Tai 1994). Individual components of the integrated system have been developed and tested. The following is a discussion of their design and capabilities.

Keywords

Drag Reduction Streamwise Vortex Surface Shear Stress CMOS VLSI Active Control Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Choi, H., Moin, P. and Kim, J. (1994) Active turbulence control for drag reduction in wall-bounded flows, J. Fluid Mechanics 262, 75–110. ADSzbMATHCrossRefGoogle Scholar
  2. Ho, C M. and Tai, Y.C. (1994) MEMS - Science and Technology, ASME Winter Annual Meeting, Chicago111Google Scholar
  3. Brüse, M., Bechert, D.W., van der Hoeven, J.G.Th., Hage, W. and Hoppe, G. (1993) Experiments with conventional and with novel adjustable drag-reducing surfaces, Near-Wall Turbulence Flows Elsevier Science Publishers B.V.Google Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Chih-Ming Ho
    • 1
  • Steve Tung
    • 1
  • Yu-Chong Tai
    • 2
  1. 1.Mechanical and Aerospace DepartmentUniversity of California, Los AngelesLos AngelesUSA
  2. 2.Department of Electrical EngineeringCalifornia Institute of TechnologyPasadenaUSA

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