Microactuator arrays for sublayer control in turbulent boundary layers using the electrokinetic principle

Werner Dahm, Francisco J. Diez-Garias, Phillip H. Paul

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations


Control principles and microactuator arrays are described for drag reduction in turbulent boundary layers by manipulation of streamwise sublayer vertical structures. The microactuators described here are fundamentally different from traditional MEMS approaches. They have no moving parts, and induce volume displacements of the sublayer vortices by means of electrokinetic pumping under a time-varying applied voltage. Such electrokinetic microactuators have characteristics making them potentially suited for practical sublayer control on real vehicles. Theoretical frequency response of such eiectrokinetic microactuators is in the MHz range: actual microactuators have been fabricated and tested to frequencies as high as 20 kHz and shown essentially no AC performance losses. A basic three-layer design for such electrokinetic microactuator arrays has been developed, and several generations of microactuator arrays have been fabricated. Current fabrication is based on laser drilling of electrokinetic channels in plastic substrates with traditional metallization processes for the electrodes and leadouts. A porous polymer matrix is used for the electrokinetic channels. Two types of microactuator arrays are described; "point" actuators for active control with colocated sensors and processing, and "slot" actuators for passive control based on the "oscillating wall" approach, for which no local sensors or processing are required.

Original languageEnglish (US)
Title of host publication38th Aerospace Sciences Meeting and Exhibit
StatePublished - 2000
Externally publishedYes
Event38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States
Duration: Jan 10 2000Jan 13 2000


Other38th Aerospace Sciences Meeting and Exhibit 2000
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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