15.13 starting and ignition Flashcards
(8 cards)
1
Q
what are the two factors required to ensure an engine will start satisfactory
A
- provision must be made for the compressor and turbine to be rotated up to a speed at which adequate air passes into the combustion system to mix with fuel from fuel spray nozzles
- provision must be made for ignition of the air/fuel mixture in the combustion system
2
Q
how are gas turbine engines started
A
rotating high pressure compressor
to supply air to support combustion
3
Q
what type of starter is used on most commercial jet
A
air starter
4
Q
pros of air starter
A
light
simple
economical
5
Q
how much psi is needed to start an engine using an air starter
A
30-50psi
6
Q
what engines use the direct cranking electric starting systems
A
small turbine negines such as apus
7
Q
when is continuous ignition used
A
when there is a possibility of flameout
such as flying through hailstorm or volcanic clouds
8
Q
A
