针对现有飞机客舱空调采用常规的恒值信号送风，无法将引气污染物快速排出舱外的问题，采用计算流体力学（CFD）技术建立Boeing737飞机客舱仿真模型，并使用粒子图像测速（PIV）实验验证客舱仿真模型的准确性。提出客舱空调采用梯形信号送风，与客舱空调常规的恒值信号送风进行对比，以NO₂为引气污染物，模拟在相同通风量不同信号送风下，天花板送风、侧壁送风、混合送风方式的流场特征与污染物扩散规律，将等效稀释通风量指标与吹风感指标结合，确定飞机空调最佳送风工况。仿真结果表明：采用等效稀释通风量指标对客舱整体排污效果进行评估，相比于恒值信号送风，客舱空调采用梯形信号送风在天花板送风、侧壁送风、混合送风方式下等效稀释通风量分别提高了78.2%、34.3%、23.1%。其中，客舱空调使用梯形信号送风在天花板送风方式下具有最好的排污效果，并且其吹风感指标DR（Draft Rating）低于20%，满足乘客热舒适性要求，梯形信号送风的吹风感指标优于方波信号送风，排污效果优于正弦信号送风。

To address the problem of poor removal effect of bleed air pollutants in the cabin with conventional constant signal supply， a Boeing737 cabin simulation model was established by the Computational Fluid Dynamics （CFD） technology， and the accuracy of the cabin simulation model verified by the Particle Image Velocimetry （PIV） experiment. The trapezoidal signal was used to supply air for cabin air conditioning in comparison with the constant signal. NO₂ was selected as the bleed air pollutant. The flow field characteristics and pollutant dispersion law of ceiling air supply， sidewall air supply， and mixed air supply with the same ventilation volume and different signal air supplies were simulated. The optimal air supply condition of aircraft air conditioning was determined by combining the diluting flow rate index and draft rating index. The diluting flow rate index was used to evaluate the effect of pollutant removal in the cabin. The simulation results show that compared with the constant value signal air supply， the diluting flow rate of the cabin air conditioner with trapezoidal signal air supply is increased by 78.2% in the ceiling air supply mode， 34.3% in the side wall air supply mode， and 23.1% in the mixed air supply mode. Among them， the cabin air conditioner using the trapezoidal signal air supply displays the best pollution discharge effect in the ceiling air supply mode， and its draft rating index DR is less than 20%， meeting the thermal comfort requirements of passengers. Compared with the square wave signal air supply and sinusoidal signal air supply， the trapezoidal signal air supply has a better draft rating index than the square wave signal air supply， and a better pollution discharge effect than the sinusoidal signal air supply.