磁性流体と弾性膜を用いた層流制御用アクチュエータの開発

概要

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An electromagnetic actuator with magnetic fluid and elastic membrane is developed in this paper for laminar flow control. The actuator consists of a magnetic fluid layer, an elastic membrane and nine coils. The coils with 1600 turns of coated copper wire are used to generate magnetic field in the actuator. The elastic membrane is moved up and down by alternative magnetic field applied to the magnetic fluid layer, and the motion is used to control the transition of boundary layer from laminar flow to turbulent flow. The static and dynamic characteristics of the actuator, including displacement of elastic membrane and frequency response, were experimentally investigated. The effectiveness of the actuator in laminar flow control was shown by wind tunnel testing. The two-dimensional wave, or Tollmien-Schlichting wave(T-S wave), induced in boundary layer of a flat plate by a speaker was effectively attenuated by the developed actuator installed in the plate.
2000-01-25