Aeroplane Propulsion Flashcards
1
Q
What is the air to fuel weight ratio in the burner?
A
60/1
2
Q
What percentage of the energy is used for thrust and therefore the percentage used to drive the compressors
A
25% for thrust
75% to drive compressors
3
Q
Characteristics of a turbofan engine
A
Fan acts like a propeller
Primary airflow: through the burner
Secondary airflow: through the fan
Bypass ratio: secondary flow/primary flow
High BPR results in fuel efficient subsonic flight
Passenger planes have a high BPR while fighter jets have low BPR
