Because the flying speed of the aircraft is very fast and the overall weight is very large, its "braking" requires a lot of braking force, especially on runways such as water, snow and ice, only the turbulence on the wings The brakes of the board and the landing gear are far from enough to meet the braking requirements, which requires us to mention our protagonist today - the aeroengine thrust reverser.
The thrust reverser is a commonly used deceleration device for large aircraft. By changing the jet direction of the aeroengine from backward to forward, it generates a thrust opposite to the forward direction of the aircraft, which greatly improves the deceleration performance of the aircraft when it lands, and even realizes "reversing". ". Since the application of the thrust reverser, the landing run distance of the aircraft has been shortened from 3,000 meters to less than 450 meters, with higher "braking" reliability.
Types of thrust reversers
01
Baffle type thrust reverser
The baffle-type reverse thrust generates reverse thrust by opening two bucket-shaped baffles to change the direction of the airflow. This thrust reverser is installed at the rear end of the aeroengine, and its structure is relatively simple, and its reliability is high, but it is relatively heavy and its braking efficiency is low. Baffle-type thrust reversers are mainly used in turbojet engines or engines with small bypass ratios.
02
cascade thrust reverser
The cascade reverse thrust is composed of cascades, choke doors and a movable cover. After the thrust reverser is activated, the movable cover moves backward to expose the cascades, and the choke door is closed at the same time to block the forward airflow of the engine, and the airflow is smooth. It is discharged in the opposite direction against the cascade, generating reverse thrust. The cascade-type thrust reverser structure is relatively complicated, but it is more dexterous and compact, with good airflow guidance and high braking efficiency. The Boeing 747 passenger aircraft uses a cascade thrust reverser.
03
baffle door pushback
The baffle-type thrust reverser combines the structural characteristics of the baffle-type thrust reverser and the cascade-type thrust reverser. It has a set of baffle doors around it. The airflow can change the direction of the airflow and produce the effect of reverse thrust. The structure complexity and braking efficiency of this kind of thrust reverser are between the cascade type thrust reverser and the baffle type thrust reverser, and its requirements on the sealing of the folding door are relatively high. The common wide-body airliner Airbus A330 and A340 adopt the baffle door thrust reverser.
