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The effect of external flow velocity on the momentum transfer of DBD plasma actuators

机译:外流速度对DBD等离子致动器动量传递的影响

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An experimental study is performed towards identifying possible cross-talk effects between DBD actuators and externally imposed flow. The actuator has been positioned in a boundary layer operated in a range of free stream velocities from 0 to 60 m/s, and tested both in the upstream and downstream configuration. Two experimental set-ups were tested. In the first measurement campaign the flow field and the plasma induced momentum has been measured using Particle Image Velocimetry from which the actuator momentum transfer was derived. In the second experimental campaign the DBD actuator was made stronger and the body force was measured directly with a load cell. Electrical measurements were also used for estimating the power consumption and the discharge formation has been visualized using an intensified CCD camera. Results show the measured force is practically constant over the range of considered wind speeds, with the same magnitude and opposite direction for the upstream and downstream configuration. The power consumption measured was also constant for different flow velocities and actuator configurations. This indicates that the external flow velocity does not have a significant impact on the momentum transfer of the actuator, seemingly confirming the commonly used assumption that the actuator's body force is independent of the external flow.
机译:对识别DBD致动器和外部施加流动之间可能的串扰效果进行实验研究。致动器已经定位在从0到60m / s的自由流速度范围内操作的边界层,并在上游和下游配置中测试。测试了两种实验组。在第一测量活动中,使用颗粒图像速度来测量流场和等离子体诱导的动量。在第二个实验活动中,DBD致动器更强,体力直接用载荷电池测量。电测量还用于估计功耗,并且使用强化的CCD相机可视化放电形成。结果示出了测量的力在考虑风速范围内实际上是恒定的,其幅度和下游构造相同的幅度和相反的方向。测量的功耗也是不同的流速和致动器配置的恒定。这表明外部流速对执行器的动量转移没有显着影响,似乎证实了致动器的体力与外部流动独立的常用假设。

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