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What is the purpose of nozzle in a aircraft engine?
All gas turbine engines have a nozzle to produce thrust, to conduct the exhaust gases back to the free stream, and to set the mass flow rate through the engine. The nozzle sits downstream of the power turbine.
Why nozzles are made convergent and divergent?
Convergent-divergent type of nozzles are mostly used for supersonic flows because it is impossible to create supersonic flows (mach number more than one) in convergent type of nozzle and therefore it restricts us to a limited amount of mass flow through a particular nozzle.
Why are square nozzles used in two engined aircraft?
Square nozzles only allow to create pitch forces, because their panels can only be moved around one axis. When moved differently in two-engined aircraft, limited roll moments are also possible. Round nozzles are lighter.
How does the nozzle work in a rocket engine?
A rocket engine uses a nozzle to accelerate hot exhaust to produce thrust as described by Newton’s third law of motion. The amount of thrust produced by the engine depends on the mass flow rate through the engine, the exit velocity of the flow, and the pressure at the exit of the engine.
What happens when a jet pipe nozzle is changed?
One thing so far not mentioned or considered is that as the jet pipe nozzle changes area the static pressure within it will change. Consequently the differential pressure across the L.P. turbine (assuming a twin or triple spool engine) will also change.
Which is thrust vectoring nozzle used in PAK FA?
The ‘flat’ thrust vectoring nozzles used in F-22 allows control only in the pitch (and roll) axis. However, they do allow higher deflection compared to the axisymmetric nozzles, with the F-119 engine used in F-22 allows deflections upto 20 degrees. Another point is that the PAK FA uses a variant of the engine used in Su-30, the AL-41F1.