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
Let C (K) denote a European vanilla Call option with strike price K. Assume that all options are identical except for strike price, and strike prices satisfy K1 What are the no-ar
a rectangular beam of size 40mm*60mm is subjected to bending. the maximum bending stress is limited to 75N/mm^2. find the moment of resistance of beam section.
explain ratio analysis and its significant
Casting Alloys are - (i) Permanent moulds are commonly used for the casting of grey iron, aluminum alloys and magnesium alloys. (ii) Slush Casting
Consider 1:1 stoichiometric polymerisation of 1,4-diaminobutane with sebacoyl chloride. (a) Write down a balanced chemical equation for the polymerization (b) Name the polymer fo
require help in making pov display
Means of escape - place of safety: The means of escape in a building are often supplemented by a fire warning system that may or may not include automatic detection, depending
A methane-fired microturbine based on the regenerative gas turbine cycle employs a centrifugal compressor with a polytropic efficiency of 85%, a radial inflow turbine with a polyt
Q. W hat do you understand by crystallographic notation of atomic planes/Explain with the help of examples. Ans.Crystallographic Notation 1. Crystal Symmetry:
Dit fft idft
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