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1454 Y. TIAN et al. Fig. 8 Evolution of infrared temperature contours with time in the anti-icing process. 4. Mechanisms of DBD plasma anti-icing To investigate the DBD plasma anti-icing mechanisms, some specific surface points are selected as monitoring points to trace the variations of surface temperatures with time at these points. As is shown in Fig. 11, points A, B, C, which are respectively the mid-points between electrodes 1 and 2, 3 and 4, and 5 and 6, are located along a spanwise straight line (y-axis direction) on the upper surface near and downstream of the leading edge. Similarly, points D, E, F, which are respectively the mid-points between electrodes 1 and 2, 3 and 4, and 5 and 6, are located along a spanwise straight line on the upper surface immediately downstream of the mid-chord point. Points G, M, N and H, P, Q, which are on the side edges of electrodes 1, 5, and 6, respectively, are located on the same lines as points A, B, C and points D, E, F, respectively. Fig. 12(a) demonstrates the evolution histories of the sur- face temperatures at points A, B, C. The three temperatures kept a value about 12C before t=5.4s. At t=5.4s, when the spraying system started, the three temperatures went down sharply to about 5 C at 6.4 s within about 1 s, and then under- went a slight increase to about 6 C at about 7.4 s. After this instant, the surface temperatures went down slowly to reach about 5 C until t = 35 s, and then remained a constant value of 5 C thereafter. Similar phenomena occurred for the evolution histories of the surface temperatures at points D, E, F, points M, N, and points P, Q as shown in Fig. 12(b)–(d), respectively. That is to say, before supercooled water droplets impacted the surface, the temperatures kept a relatively high constant value T0. At the moment of impacting (t = t0), the surface temperatures went down sharply to a relatively low value within a very short period of time (about 1 to 2 s), and then started to go up to a cer- tain value, followed by decreasing to or directly keeping at a con- stant value of T1 at t = t1. These features are sketched in Fig. 13. Temperature is a physical quantity which represents the degree of hotness or coldness of a body or a medium macro- scopically, and is a measure of the average kinetic energy of the random motion of the molecules of a fluid microscopically. That temperature remains constant means that a thermal equi- librium on a model surface is achieved. The heat fluxes in the anti-icing process include the following30 (1) The specific heat flux convected away from the body sur- face caused by the difference between the body surface temperature and the boundary layer outer edge temper- ature (qa). (2) The specific heat flux added to the body surface by the boundary layer friction (qv).PDF Image | Experimental study of an anti-icing method over an airfoil based on pulsed dielectric barrier discharge plasma
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