What is thrust reverser cascade?

A thrust reverser cascade is a type of thrust reverser that is used to direct the flow of exhaust gases from a jet engine forward, which helps to slow down an aircraft upon landing. It consists of several cascading ramp-like structures that are installed around the engine nozzle, which are designed to redirect the flow of exhaust gases in a forward direction. The redirected gas stream creates a braking force that helps to reduce the aircraft's speed before touchdown, reducing the need for braking during landing. Thrust reverser cascades are commonly used on commercial airliners and military aircraft, and can be deployed either automatically upon landing or manually by the pilot.