Abstract: Fluids in a dielectric barrier glow discharge at atmospheric pressure have attracted interest from communities of thermo and fluid dynamics, as well as control. This work investigated the effects of a plasma actuator, operating at 8.0 kV and 4.4 kHz, on the pressure distribution around a polyvinyl chloride circular cylinder in low-velocity airflow. The experiment was repeated with the actuator at various angles. The results show an acceleration of the flow demonstrated by a 60% lower pressure coefficient at the actuator area. The flow separation was also delayed by an angle of as much as 30°. These effects were shown to be greater when the actuator was positioned at an angle closer to the separation area.

RESUMO Atualmente, utilizam-se fotos aéreas obtidas de aviões equipados com câmaras especiais e "spots" conseguidos através de satélites de sensoriamento remoto. A proposta deste trabalho é utilizar-se um foguete de pequeno porte com alcance de 2.000m cuja carga útil é uma câmara fotográfica de 35mm com capacidade de 40 fotos. A câmara é abandonada no ponto mais alto da trajetória e retorna ao solo amparada por um pára-quedas, no período de queda, quando um circuito eletrônico dispara a câmara com intervalos controlados estabelecendo, assim, a escala da seqüência de fotos.

ABSTRACT At present pictures in aerial photographics are taken by aeroplanes with special cameras and spots taken by satellites with remote sensory equipment. The proposal of this work is to use a small rocket with a 2.000m range. The load of this rocket is a 35mm lens camera with a 40 pictures film. The camera separates at the highest point of the rocket trajectory and is retrieved at ground level after a parachute descent. During the camera fall an electronic circuit takes photos at controlled intervals, thereby creating the scale of the sequence of photographs.