15.3 INLET

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INLET PURPOSE

• To provide stream line air and to prevent air speed going to compressor above Mach 1 (supersonic speed)

• To prevent from shock wave, compressor cant work and damage might occurs.

SUBSONIC TYPE INLET

Convergen duct

Mach 1 M< 1

CONVERGEN TYPE INLET

Aircraft speed can up to Mach 1.2

BELLMOUTH INLET (HELICOPTER)

SAND AND ICE SEPERATOR

Sand stay at bottom due to inertia

TURBOPROP INLET

SUPERSONIC TYPE INLET

VARIABLE THROAT AREA INLET MOVABLE PLUG TYPE

Aircraft speed can up to Mach 4

ICE PROTECTION

• Ice tend to make the airflow not smooth.• Can cause engine un efficient due to turbulent

and compressor stall.• Normally occur on intake lip and compressor

inlet ducting.

TYPE OF ICE PROTECTION• Hot Air System

– Bleed from HP compressor and pass through pressure regulating valve– Provide overheat sensor to prevent overheated

• Electrical System– Normally on turboprobeller– Electrical heating element bounded to outer surface of intake cowl– Intake leading edge continously heated (anti-icing) and other strip heted

intermittent (de-icing)

• Hot Oil System– Utilise hot scavenge oil to heat inlet casing– Normally in conjuction with hot air anti-icing or electrical system