gasturbine exhaust systems

#9. The shape of the volume within the jet pipe casing immediately to the rear of the turbine:

• AIs convergent to accelerate the gases towards the propelling nozzle.
• BIs divergent to accelerate the gases away from the turbine blades.
• CIs convergent to increase the pressure of the gases in the jet pipes.
• DIs divergent to reduce the velocity of the gases leaving the turbine.

#1. The velocity of the gases in the exhaust unit is held to:

• A0.5 Mach to minimise turbulence.
• B0.75 Mach to optimise the pressure distribution.
• C0.85 Mach to maximise thrust.
• DMach 1 to maximise acceleration.

#2. The exhaust cone:

• AStraightens the gas flow before it goes into the turbine assembly.
• BPrevents the hot gases flowing across the rear turbine face.
• CIncreases the velocity of the gases.
• DDecreases the pressure of the gas.