プラズマアクチュエータを用いた長方形噴流の制御に関する数値解析

抄録

The control mechanism for the rectangular jet using a plasma actuator with the burst frequency is investigated by the numerical simulation. When the plasma actuator is activated with the 55Hz burst frequency, the 10% duty rate and the antiphase, the full width at half maximum increases about 3 times compared to that of the without control case. The control effect might come from the two vortices which are created by the plasma actuator and the different vorticities for the vortices generated on the upper and lower surface of the rectangular jet. The first vortex from the upper surface of the rectangular jet is mixed the second vortex from the lower surface of that and is convected lower direction. The reverse phenomenon occurs for the second vortex from the upper surface of the rectangular jet. Therefore, the diffuse effect could be facilitated. On the other hands, when the condition for the plasma actuator is the 700Hz burst frequency, the 10% duty rate and the antiphase, the full width at half maximum decreases about 0.8 times compared to that of the without control case. The reason is that the vortex formed rapidly by the plasma actuator is smaller than the vortex from the mainstream which no longer generate afterwards the activation of the actuator, thus the diffuse effect could be suppressed.