How does a cascade-type thrust reverser operate?

How does a cascade-type thrust reverser operate?

• A. A portion of the fan cowl moves rearward, and blocker doors deflect the fan discharge air through fan cascades that direct the discharge air forward, while core flow is shut off and deflected through cascades forward.
• B. Only deflects the core exhaust; fan flow continues.
• C. Only blocks the fan flow.
• D. Disables the engine.

Answer: (A)

The basic idea is that a cascade-type thrust reverser uses a translating panel and blocker doors to redirect the fan bypass air through a bank of cascade vanes so that the air is turned forward, producing reverse thrust. When deployed, a portion of the fan cowl moves rearward to open the cascade area, and blocker doors seal off the normal bypass exit. The fan discharge air is then directed through the cascades, which deflect it forward. In this design, the core flow is also routed through the reverser path so it contributes to the forward turn, effectively reversing its thrust as it exits forward through the cascades. This combination of blocking the forward bypass path and steering the flow through the cascades forward is what creates the reverse thrust.

The basic idea is that a cascade-type thrust reverser uses a translating panel and blocker doors to redirect the fan bypass air through a bank of cascade vanes so that the air is turned forward, producing reverse thrust. When deployed, a portion of the fan cowl moves rearward to open the cascade area, and blocker doors seal off the normal bypass exit. The fan discharge air is then directed through the cascades, which deflect it forward. In this design, the core flow is also routed through the reverser path so it contributes to the forward turn, effectively reversing its thrust as it exits forward through the cascades. This combination of blocking the forward bypass path and steering the flow through the cascades forward is what creates the reverse thrust.