The invention belongs to the technical field of aircraft air-conditioning cabin air recirculation design, and relates to a low-noise passive cabin air recirculation system, which is characterized in that a Laval nozzle is inserted into a cabin air supply pipeline, the flow velocity of air flowing through the throat part of the nozzle is accelerated, the static pressure is reduced, and negative pressure is formed in the area near the outlet of the nozzle; a hole is formed in the position, close to an outlet of the Laval nozzle, of the air supply pipeline, and ambient air is ejected through negative pressure to form cabin air recirculation. Due to the design of the low-noise passive cabin air recirculation system, the fresh air supply amount of the cabin is reduced, so that the air entraining compensation of an engine is reduced; the uniformity of a cabin temperature field is facilitated; in addition, due to the fact that recirculating fan equipment is omitted, the working reliability of the cabin ventilation system is improved, meanwhile, the problem of high noise when the recirculating fan works is solved, and the sound environment level of the cabin can be improved.
本申请属于飞机空调座舱空气再循环设计技术领域,为一种低噪声无源座舱空气再循环系统,通过在座舱供气管路内插入一个拉瓦尔喷管,气体流经喷管喉部流速加速静压降低,在喷管出口附近区域形成负压;在供气管路上对应拉瓦尔喷管出口附近的部位开孔,利用负压引射周围空气形成座舱空气再循环。低噪声无源座舱空气再循环系统设计降低座舱新鲜空气供气量,从而降低发动机引气代偿;并有利于座舱温度场的均匀性;且由于取消了再循环风扇设备,提高了座舱通风系统工作的可靠性,同时避免了再循环风扇工作时的高噪声问题,有利于提升座舱声环境水平。
Low-noise passive cabin air recirculation system
一种低噪声无源座舱空气再循环系统
2022-12-23
Patent
Electronic Resource
Chinese
IPC: | B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT |