基于空调正弦送风的清除客舱引气污染物方法

Removal cabin bleeding air system gaseous pollutants method based on air conditioning sinusoidal wind

客机从廊桥推出排队等待起飞期间,机坪大量的气态污染物会从发动机引气系统直接进入客舱,目前客舱空调采用的是恒值风速送风,引气污染物的清除效率不高。基于此,建立了Boeing737客舱仿真模型,通过粒子图像测速(PIV)实验验证了客舱仿真模型的准确性。选取NO_(2)为引气污染物,空调采用正弦信号送风替代恒值信号送风,模拟了天花板送风、侧壁送风和混合送风3种送风模式,获得了恒值信号送风和正弦信号送风情况下乘客呼吸区和客舱整体的NO_(2)分布特征,提出将空气龄和吹风感指数(DR)相结合的方法,评估出有利于引气污染物排出的空调最佳送风工况。结果表明:在180 s时,相比恒值信号送风,空调采用正弦信号送风后,在天花板送风模式下,客舱内的NO_(2)平均质量浓度降低了7.95%,侧壁送风模式下降低了6.51%,混合送风模式下降低了23.3%。正弦信号送风下混合送风模式NO_(2)清除效果最好,空气龄最小,且乘客的吹风感指数也符合热舒适性要求。

The gaseous pollutants get into the cabin by the engine bleeding air system when the plane is waiting for taking off on the apron.However,the cabin air conditioning wind speed is constant,and the removal efficiency of the bleeding gaseous pollutants is low.To solve this problem,the Boeing737 cabin simulation model was established and the accuracy of the cabin simulation model was verified by particle image velocimetry(PIV)experiment.The air conditioning used sinusoidal wind instead of the constant wind,and used NO_(2) as bleeding air pollutant.Three work modes of air supply,the ceiling air supply,sidewall air supply and mixed air supply were simulated.The distribution results of NO_(2) in passenger breathing areas and cabin were obtained by constant wind and sinusoidal wind.A method based on air age and draft rating index(DR)was proposed to evaluate the best air conditioning work mode,which is efficient in removing cabin gaseous pollutants.In 180 seconds,the average concentration of NO_(2) decreased by 7.95%by sinusoidal wind ceiling air supply mode.The sinusoidal wind sidewall air supply mode decreased by 6.51%,and the sinusoidal wind mixed air supply mode decreased by 23.3%.The sinusoidal wind mixed air supply mode has the best effect on the removal of NO_(2) and the minimum air age.The draft rating index meets the requirements of thermal comfort.