Jet propulsion

Question 1

Basic principle

Answer 1

Newton’s 3rd law

For every action, there is an equal and opposite reaction

Question 2

Jet thrust

Answer 2

Question 3

How does a jet engine works?

Answer 3

Brayton cycle

Question 4

Function of a compressor

Answer 4

sucks and squeeze drawn air compresses the air air is forced into the combustion chamber at very high pressures

Question 5

Sets of blades on a compressor

Answer 5

rotor blades-force air backwards stator blades-channel the air so that it hits the next set of rotor blades at the right angle

Question 6

Engine start requirements

Answer 6

rotation of compressors and turbines stable airflow atomised fuel at combustion chamber ignition

Question 7

Turbojet engine

Answer 7

fighter planes

Question 8

Turboprop engine

Answer 8

propeller aircraft most propulsive efficient engine at low speeds

Question 9

Turbofan engines

Answer 9

airlines 90% of air bypassed, 10% passes through the core Bypass turbojet engines are more propulsive efficient than pure turbojet engines

Question 10

Turboshaft engine

Answer 10

helicopters

Question 11

Propulsive efficiency

Answer 11

efficiency in which the energy in the fuel is converted into propulsive energy dependent on thermal energy conversion and effectiveness in converting thermal energy into propulsive energy

Question 12

Power to jet

Answer 12

Question 13

Power to aircraft

Answer 13

Question 14

For a given thrust, how can propulsive efficiency be improved?

Answer 14

increase mass flow rate decrease exhaust velocity