Thrust Augmentation and Engine Performance

Question 1

What is the method of afterburning?

Answer 1

introduce fuel in the exhaust to be burnt and increases temperature, and creates more gasses, and increases velocity

Question 2

What is the method of water/methanol injection?

Answer 2

Introduction of water or methanol into the engine airflow to increase its density, through cooling and therefore restore its output or even increase the output of the engine?
Used for high altitude performance.

Question 3

What are the two methods of water injection?

Answer 3

Spray into the eye of the compressor

Injection of coolant into the combustion chamber

Question 4

What are the purpose of the water and the methanol?

Answer 4

Water: To reduce turbine inlet temperature
MEthanol: Burning of methanol in the combustion chamber to restore power at high altitudes

Question 5

What is thrust-specific fuel consumption?

Answer 5

The fuel efficiency of an engine design with respect to thrust output.
Is the mass of fuel need to provide the net thrust for a given period

Question 6

Explain turboprop reduction in SFC?

Answer 6

A cause of reduction in SFC with an increase in speed for turboprop is due to ram effect causing windmilling within the compressor
Propeller efficiency deteriorates at high altitudes.