Figure 7
(a) Thrust generated by the proposed DBD plasma actuator as a function of the number of electrodes when applying 8-kV DC voltage combining negative 8-kV pulses with a frequency of 500, 1000, and 2000 Hz. This is consistent with the numerical simulation results, and more thrust was obtained at a higher pulse repetition. The thrust produced by a typical AC DBD plasma actuator under similar experimental conditions (except for frequency)42 is also plotted for comparison. (b) Thrust to power ratio as a function of the number of electrodes. The efficiency of our method is higher than that of a typical AC DBD plasma actuator when we use three or more electrodes. (c) Stream-wise velocity profiles for the proposed method with a repetitive pulse frequency of 2000 Hz. No apparent flow was obtained for with the conventional method, whereas a wall jet formed and accelerated using the proposed approach.
