COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Reciprocating type

Lobe type

Centrifugal type

Axial flow type

Reciprocating compressor

Radial flow compressor

Roots blower

Axial flow compressor

p₁ = p₂ p3

p₂/p₁ = p₃/p₂

p₁ = p3

p₁/p₃ = p₂/p₁

Compressor work and turbine work

Actual compressor work and theoretical compressor work

Output and input

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

To increase the output

To increase the efficiency

To reduce the exit temperature

To save fuel

Higher at high speed

Same at all altitudes

Higher at high altitudes

Lower at low speed

Gas turbines have high standby losses and require lot of maintenance

Gas turbine is capable of rapid start up and loading

Gas turbines has flat efficiency at part loads

Gas turbine requires lot of cooling water

Air stream blocking the passage

Air stream not able to follow the blade contour

Motion of air at sonic velocity

Unsteady periodic and reversed flow

Delivers 3 m³/ min of compressed air at delivery pressure

Compresses 3 m³/ min of free air

Compresses 3 m³/min of standard air

Delivers 3 m³/ min of compressed air

Adding heat exchanger

Injecting water in/around combustion chamber

All of these

Reheating the air after partial expansion in the turbine