Pitot Tube-Based Icing Detection: Effect of Ice Blocking on Pressure

Figure 4

Total and static pressure outputs of the pitot tube after blocking by rime ice. O–A: the entire air pressure detection system is stationary. A–B: the L-shaped pitot tube is placed into the ice wind tunnel at point A, such that the total pressure hole is facing the incoming wind direction. B–C: the spray system is turned on at point B. C–D: after point C, the pitot tube is in an icy state, ice accumulates, and the icing state is rime ice (as shown in Figure 5). After point D, the ice shape is basically stable.