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1452 Y. TIAN et al. Fig. 3 Schematic illustration of experimental system. Fig. 4 Geometric structures of two exposed electrodes. Fig. 5 Waveforms of discharged voltages from striped electrode and meshy electrode in anti-icing tests. Fig. 7 shows pictures of the upper and lower surfaces around the leading edge of the airfoil after the spraying system was stopped, which may reflex the anti-icing effects of the striped electrode to some extent. The area cover by the striped electrode was as clean as it was before spraying, while other areas of the leading edge along the spanwise direction were covered by ice accretion. The above process shows that the DBD plasma generated by the striped electrode can prevent ice accretion on the leading edge. Fig. 8 shows the evolution of infrared temperature contours with time in the anti-icing process of the striped electrode. It can be seen that before spraying, the temperature in the area covered by the electrode was much higher than the freestream static temperature, and on the airfoil surface, the closer to the electrode, the higher the temperature. However, at the moment when the spraying system was started and supercooled water droplets impacted on the leading edge, the temperature in the area covered by the thin water film went down a little, while the temperature in other areas remained nearly the same as that before spraying. At 30 s after the spraying started, the temperature distribution became stable and began to remain unchanged. Still, the closer to the electrode, the higher the tem- perature. The only difference is that the peak temperature was decreased by about 8 C. Nevertheless, the temperature in the electrode area was still much higher than the freestream value. Fig. 9 shows the anti-icing process of the meshy electrode. Under the given actuating voltage and frequency as mentioned above, similar situations in some aspects occurred here, i.e., after the spraying system started, a very thin water film formed on the model surface, while the discharge glow over some areas of the electrode was visible, but invisible over other areas of the electrode. The areas where the glow was invisible should be the place where no gas discharge happened. The discharge glow became stable at 30th second after the start of spraying, and remained unchanged afterwards. Ice accretion did not occur in the area covered by the electrode, while grew thicker and thicker on other parts of the leading edge. Fig. 10 shows pictures of the upper and lower surfaces around the leading edge of the airfoil after the spraying system was stopped, which illustrate the anti-icing effects of the meshy electrode to some extent. The area covered by the meshy elec- trode was as clean as it was before spraying, while other areas of the leading edge in the spanwise direction were covered by ice accretion. The above process shows that the DBD plasma generated by the meshy electrode can prevent ice accretion on the leading edge.PDF Image | Experimental study of an anti-icing method over an airfoil based on pulsed dielectric barrier discharge plasma
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