To solve the problem of poor removal effect of bleed air pollutants in the cabin under constant signal air supply condition of aircraft air conditioning, a five-row Boeing 737 cabin simulation model is established, and the rationality of the cabin simulation model verified by the Particle Image Velocimetry (PIV). Then the square wave signal instead of constant signal is used to simulate and calculate the air flow characteristics and bleed air particle distribution characteristics in the cabin in the three modes of ceiling air supply, side wall air supply and combined air supply. A method to determine the optimal air supply mode of aircraft cabins by combining the removal effectiveness and draft rating index is proposed. The thermal comfort of passengers is checked by the draft rating index, while the optimal air supply condition evaluated by the contaminant removal effectiveness. The results show that using square wave signal air supply can improve the contaminant removal effectiveness of combined air supply and side wall air supply by 8.2% and 16.3%, respectively, compared with the constant signal air supply. Moreover, the combined air supply has the optimal contaminant removal effectiveness, and the ceiling air supply can reduce the pollutant concentration to the minimum in the passenger breathing area.
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