air system Flashcards
1
Q
what are the functions of internal air systems?
A
cooling, pressurisation and anti-icing
2
Q
what main parts of the engine require cooling?
A
turbine blade section
3
Q
what are the 4 main methods of cooling?
A
impingement, convection, film, transpiration
4
Q
where is bleed air taken from?
A
the compressor
5
Q
what are the 2 things that air in the combustion chamber does?
A
cools the combustion chamber and holds the shape of the flame so the metal doesn’t burn
6
Q
why is the air used to cool the turbines not the coldest air in the engine?
A
because it could cause thermal shock and fatigue the metal
7
Q
what effect does a higher air temperature have on engine performance?
A
negative effect, engines work better at colder temperatures
