CAP 12 GAS TURBINE DESIGNS

Question 1

Single spool turbo jet

Answer 1

One drive shaft the drives the whole compressers

Question 2

Single spool centrifugal turbojet

Answer 2

Centrifugal air fed to the chambers

Question 3

Twin spool Axi centrifugal

Answer 3

Fan and compressor is connected to one set of turbine and then air passes to the centrifugal ,which then goes to reverse flow combustion chamber (connected to other turbine ).

Question 4

Single spol axial flow turbojet

Answer 4

Only efficent for high speeed flight
Small frontal area produces low drag
No commercial airlines uses this design bc it is inefficient and noisy

Spool: an assembly comprising a compressor and turbine connected by shaft
Axial flow : the passage of air through the engine directly from front to rear along the egines axis

Question 5

Twin spool by pass enigne

Answer 5

By pass ratio is calculated by

Total inlet air
Core air flow

By pass flow= total flow -core flow

Question 6

Measuring staton

Answer 6

P0 T0&raquo_space;at the inlet
P3 T3&raquo_space;at the diffuser
P7 T7» at the exhaust (jet pipe)

N1 the most forward spool pressure compressor ,
N2 second spool pressure compressor

Question 7

Turboprop

Answer 7

Lp Centrifugal compressor ,hp centrifugal compressor ,reverse flow combustion chamber ,hp turbine,LP turbine, power turbine drives the reduction gearbox

Question 8

Powering up a free turbine turbo prop

Answer 8

Powering up this happens:

Fuel flow >up
Turbine GT >up
GAS generator> up
RPM >up
Torque> up
Prop rpm>constant
Thrust>up

Question 9

Tuboprop and turbo shaft

Answer 9

~Centrifugal compressors are ofthe used to reduce length
~most of the energy is extracted to produce torque
~torque is usually indicated as a percentage of maximum torque
~the overall contribution of torque shaft horsepower and residual thrust can be measured in equivalent shaft horse power

Question 10

Engine (king air)

Answer 10

INTAKE IS AT THE BACK AND EXHAUST IN THE FRONT.

SO YOU HAVE SHORTER AXEL CONNECTING THE REDUCTION GEAR BOX WITH THE FREE POWER TURBINE

Question 11

Jet engines vs piston engines

Volume and pressure

Answer 11

Jet engines»constant pressure

Piston engine&raquo_space;constant volume