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庞巴迪挑战者605公务机机组操作手册 CL605-辅助动力装置 AUXILIARY_POWER_UNIT(3)

时间:2011-10-27 15:29来源:蓝天飞行翻译 作者:公务机
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 AUXILIARY POWER UNIT Description  Vol. 2  05.10.4 
Oct 05/06 

Components and Operation

APU Generator
The APU generator adapter drives a 30 kVA, 400 Hz, three-phase AC generator. The generator is identical to the engine-driven generators, providing a backup source of 115V/400 Hz electrical power for all aircraft systems, up to an altitude of 20,000 feet.
Refer to Chapter 7, Electrical, for additional information on electrical generation.
Generator Adapter Lubrication
Generator adapter lubrication is independent from the accessory gearbox lubrication, and has a separate filler cap with an integrated dipstick for servicing.

NOTE
Wait a minimum of 30 minutes after APU shutdown to allow the generator adapter oil level to stabilize. Otherwise, quantity indications may be inaccurate, and the adapter may be overfilled.
The oil within the generator adapter lubrication system is cooled by a fuel/oil heat exchanger. The cooling fuel supply to the heat exchanger comes from the normal APU fuel feed via the right main tank. If the normal fuel feed is not available, generator adapter oil cannot be cooled, and APU operating time is limited.


 AUXILIARY POWER UNIT Description  Vol. 2  05.10.5 
Oct 05/06 


Generator adapter oil pressure is high immediately after APU shutdown. Prior to opening the APU generator/adapter oil filler cap, push and hold the pressure-relief valve cap for five seconds. This action releases pressure from the APU generator adapter housing.

Figure 05.10.3

 AUXILIARY POWER UNIT Description  Vol. 2  05.10.6 
Oct 05/06 

AIR INTAKE AND EXHAUST Description The APU air intake is located on the upper left portion of the aft fuselage, near the base of the vertical stabilizer. The opening of the intake is flush with the fuselage.
APU exhaust gases are expelled through an exhaust, and exit on the right side of the aft fuselage.
Components and Operation
Air Intake

The air intake is an s-shaped duct, equipped with an inlet screen and a water trap (with associated drain line). The intake is attached to the top of the APU enclosure.

Intake Scoop
A permanent fixed intake scoop is located aft of the APU inlet opening. The purpose of the scoop is to increase inlet ram air recovery, providing for increased performance and decreased APU EGT.

Exhaust
The APU exhaust nozzle (tailpipe) directs exhaust gases from the APU into the exhaust duct, located below the right engine. The nozzle is smaller in diameter than the exhaust duct, and therefore acts as an ejector, drawing air inside the enclosure and mixing it with the exhaust gases. This method cools the exhaust gases, and also establishes a ventilation flow in the enclosure by drawing cooling air via the spring-loaded flapper door, installed on the opposite side of the APU enclosure.
 
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