Layout and operation of typical thrust reversing system, Other Engineering

Layout and operation of typical thrust reversing system:

Clamshell door system

The clamshell door system is a pneumatically operated system, as shown in detail in fig Normal engine operation is not affected by the system, because the ducts through which the exhaust gases are deflected remain closed by the doors until reverse thrust is selected by the pilot.

On the selection of reverse thrust, the doors rotate to uncover the ducts and close the normal gas stream exit. Cascade vanes then direct the gas stream in a forward direction so that the jet thrust opposes the aircraft motion.

The clamshell doors are operated by pneumatic rams through levers that give the maximum load to the doors in the forward thrust position; this ensures effective sealing at the door edges, so preventing gas leakage. The door bearings and operating linkage operate without lubrication at temperatures of up to 600 deg.C.

375_Layout and operation of typical thrust reversing system.png

Bucket target system

The bucket target system is hydraulically actuated and uses bucket-type doors to reverse the hot gas stream. The thrust reverser doors are actuated by means of a conventional pushrod system. A single hydraulic powered actuator is connected to a drive idler, actuating the doors through a pair of pushrods (one for each door).

The reverser doors are kept in through the drive idler. The hydraulic actuator incorporates a mechanical lock in the stowed (actuator extended) position.

In the forward thrust mode (stowed) the thrust reverser doors form the convergent-divergent final nozzle for the engine.

Cold stream reverser system

The cold stream reverser system can be actuated by an air motor, the output of which is converted to mechanical movement by a series of flexible drives, gearboxes and screwjacks, or by a system incorporating hydraulic rams.

When the engine is operating in forward thrust, the cold stream final nozzle is 'open' because the cascade vanes are internally covered by the blocker doors (flaps) and externally by the movable (translating) cowl; the latter item also serves to reduce drag.

On selection of reverse thrust, the actuation system moves the translating cowl rearwards and at the same time folds the blocker doors to blank off the cold stream final nozzle, thus diverting the airflow through the cascade vanes.

 

 

1743_Layout and operation of typical thrust reversing system1.png

2105_Layout and operation of typical thrust reversing system2.png

Posted Date: 9/12/2012 2:20:01 AM | Location : United States







Related Discussions:- Layout and operation of typical thrust reversing system, Assignment Help, Ask Question on Layout and operation of typical thrust reversing system, Get Answer, Expert's Help, Layout and operation of typical thrust reversing system Discussions

Write discussion on Layout and operation of typical thrust reversing system
Your posts are moderated
Related Questions
Why Industries that manufacture racing cars prefers nickel based alloys for engine components and iron based alloys for structural parts?

3. Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+. The cylinde

Question: (a) Describe the spreading and dispreading processes of a CDMA system. (b) Autocorrelation properties are used to recover the signals correctly at the receiver. Ex

How do comets get their tails? - Most comets stay frozen in the outer solar system. Only a few enter the inner solar system where they can grow tails. - When a comet nears the sun


Parasitic resistances This is particularly noticeable if the transducer is a long way from where the power supply is located and if the transducer resistance is small.

explain compensated semiconductors


Expertsmind.com brings you unique solution in electrical engineering Audio Amplifier Classes Class A The transistor amp conducts for the entire cycle of input signal.

Q. Describe the complete procedure of testing permeability of moulding sand. How is permeability influenced by various parameters of the moulding sand ? Ans. Permeability