ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Trapezoidal signal air supply method for air conditioning to remove bleed air pollutants
Received date: 2022-05-20
Revised date: 2022-06-13
Accepted date: 2022-07-22
Online published: 2022-08-03
Supported by
Special Program for Civil Airplane of the Ministry of Industry and Information Technology(2020020306)
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.
Lixiang ZHOU , Jiaquan LIN . Trapezoidal signal air supply method for air conditioning to remove bleed air pollutants[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(10) : 127472 -127472 . DOI: 10.7527/S1000-6893.2022.27472
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