Question 1

Question 1a(i)
Explain the term thermal efficiency of a turbojet engine. Discuss the engine parameter(s) that affect(s) its thermal efficiency.

Question 1a(ii)
With the aid of appropriate thermodynamic relationship(s), explain how the thermal efficiency of a turbojet engine affects the engine fuel consumption efficiency.

Question 1b
At sea–level static maximum power, a turbojet has the following performance measurements:

Assume the engine is ideal and without losses, and that fuel low heating value hPR = 42,800 kJ/kg. Compute the following parameters:

Question 1b(i)
Fuel-air ratio.

Question 1b(i)
Engine thrust.

Question 1b(ii)
Engine output power.

Question 1b(ii)
Engine thermal efficiency.