C2 (intake)

Question 1

What the purpose of Intake:

Answer 1

-For equal air distribution
-minimum loss of pressure

Question 2

Types of intakes

Answer 2

a). Bellmouth - (subsonic-forward low speed)

b). Variable throat - (supersonic- concorde, fast jets)

c). Pitot - (subsonic-passenger aircraft)

d). Divided - (subsonic-fast jets)

Question 3

Types of intake protection

Answer 3

a). Ice shield
b). Sand filters
c). Particles separator
d). Momentum separator
e). Intake grilles

Question 4

Explain why helicopter use Bellmouth intake:

Answer 4

Due to its convergent shape will accelerate the airflow into the engine with minimum pressure loss. Entry velocity of air should be at MACH 0.5.
A bellmouth intake captures the required mass air flow and delivers it to the engine compressor at the correct speed.

Question 5

Purpose of Intake grilles

Answer 5

Prevent the ingress of FOD

Question 6

Purpose of ice shield

Answer 6

Fitted in icy conditions
Prevents ice in the intake.

Question 7

Purpose of momentum separation

Answer 7

-for anti icing engine intakes
-passive devices

Question 8

Purpose of sand Filter

Answer 8

Ambient air to enter the separator tubes of the filtering units which induces a spiral flow. Centrifugal force ensures that the sand passes through the extractor (outer) tube from where it is extracted by the ejectors. Sand is ejected overboard P2 air us fed through an electrically operated valve. Controlled by a sand filt- on/off switch.

Question 9

Purpose of particle separator

Answer 9

Swirl vanes to guide inlet air into a swirling motion whereby inertial forces act on foreign particles moving them across the swirl away from the flow.
-Active device.