Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
APU Engine
APU engines usually consist of a centrifugal compressor and a radial turbine however, axial compressors and turbines may be added or used in their own right. Centrifugal compressors are used because of their high compression and small size and when combined with a radial type turbine make the APU very compact. These components are also very robust and require less maintenance than axial flow components. Use is also made of reverse flow combustion chambers that again makes the overall size smaller.
In most cases there is a design compromise made between the ideal APU for an aircraft i.e. its ability to provide air and electricity throughout the operational envelope of the aircraft, and it weight and size. It is usual therefore to find that air and electricity are limited to various altitudes dependant upon the parameter required.
APU systems are very basic and the APU will shut down if a problem is sensed. Most APU's will shut down for the following faults:
Fault
Comment
Low Oil Pressure
Engine Overspeed
110% Honeywell 108% Sundstrand
High EGT
849°C Honeywell
Loss of Speed Signal
Electronically monitored APU's need this signal to control the APU.
Los of EGT Signal
Low Speed
Some APU's shutdown if they drop below 90%.
(Some will try and relight at 95%)
Electronic Unit Failure
Loss of Control
The APU may also shut down on the ground (not in flight) for the following faults:
Fire
May cause a warning horn in the u/c bay to sound
Generator Drive Low Oil Pressure or High Oil Temperature
Combustion chamber injection system: Injecting a water or water/methanol mixture into the combustion chambers increases the mass flow through the turbine and the high volumetri
u[-n-1]
A type of brake used to keep the vehicle from rolling when it is parked. The standard Parking brake locks the rear wheels to keep the car from moving. Parking brake cable is fixed
why front porch and back porch interval is providing before and after the horizontal simpluses
Dit fft idft
Variant Aircraft A variant aircraft is one that embodies certain design features which differ from one for which a Certificate of Airworthiness (C of A) has previously been iss
# explian working of trigger circuit in cro
Function setxor and set function unique: The function setxor receives two vectors as input arguments, and returns a vector having all the values from the two vectors which are
Fuel properties of Aircraft: EASE OF FLOW The ease of flow of a fuel is mainly a question of viscosity, but impurities such as ice, dust, wax, etc., may cause blockages in
#what are boiler troubles
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd