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5.2.2 Flat plate filled with pointing wires The wires (0.3 mm in diameter and 6 mm long) were swept back about 30° and the distance between two successive wires was 1 mm. The wire brush material was filled with epoxy resin up to around 0.3 mm from the tip of the wire. The wire was then etched in order to get wire tips of 0.1 mm in diameter. All the wires were electrically connected together by coating the back of the material with conducting paint. The active part of the plate (46 cm long and 19 cm wide) was made with 10 sections of wire brush material bonded together. This active part was mounted in a 61 cm × 23 cm support frame. Due to the wires standing a little out the plate the drag on such plate differed of about 5 to 10 % from the drag on a smooth plate, but the comparison between with and without discharge was made on the same "rough" plate. The counter electrode consisted of 0.1 mm in diameter wires mounted 4 cm above the model in a zig- zag fashion. A DC high voltage was applied between the wire brush material and the counter electrode. Both configurations positive or negative counter electrode were tested. Voltages of up to 20 kV giving currents up to 5 mA were used. The swept points of the wires brush material were tested pointing as well upstream and downstream. The stream velocity in the wind tunnel could vary up to 30 m/s. The boundary layer on the test model was laminarup to about 5 m/s and turbulent for velocities over 10 m/s. The drag on the entire frame was measured with a drag balance. When the high voltage was turned on some wires of the brush material and the counter electrode glowed visibly in a darkened room. It seemed that only 10 % of the wires of the brush material were glowing, which suggested to the authors that the distance between two successive wires could have been 3 mm instead of 1 mm. Measurements obtained shown a rather large drag 17PDF Image | PLASMA FUNCTIONALIZATION OF MULTI-SCALE STRUCTURES
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