Apu engine, Other Engineering

Assignment Help:

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.

220_APU engine.png

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

Electronically monitored APU's need this signal to control the APU.

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:

Fault

Comment

 

Fire

May cause a warning horn in the u/c bay to sound

Generator Drive Low Oil Pressure or High Oil Temperature

 

 


Related Discussions:- Apu engine

Fire evacuation signals, Fi r e evacuation signals: Members of the ...

Fi r e evacuation signals: Members of the public are known not to respond positively to fire evacuation signals. People will often try to ignore the signal and will try to

Totipotency, Why do only plant cell have totipotency?

Why do only plant cell have totipotency?

Case law on evaluatig credit requests, This case has been framed in order t...

This case has been framed in order to test the skills in evaluating a credit request and reaching a correct decision. Perluence International is large manufacturer of petroleum and

Environmental engineering, compare conventional lagoon,aerated lagoon and a...

compare conventional lagoon,aerated lagoon and activated sludge process,including process flow diagrams and hydraulic retention timesquestion #Minimum 100 words accepted#

. CFD, HOW TO MAKE ROTATING FRAME

HOW TO MAKE ROTATING FRAME

Avionic systems design- primed stability derivatives, Primed stability der...

Primed stability derivatives The rolling and yawing motions are coupled through the cross inertia I XZ due to rotation not being about the principal axes. Since in general air

Fiancial managment, Suppose you borrow $10,000 at 10% and you are going to ...

Suppose you borrow $10,000 at 10% and you are going to make monthly payments of $2,500. How long until you pay off the loan?

An essay on power train, Interior noise is basically airborne or structure-...

Interior noise is basically airborne or structure-borne. The excitation sources of vibratation and noise from engines can be divided as mechanical, combustion, and flow sources.

Decision table software engineering, Write a decision table that specifies ...

Write a decision table that specifies the rules for the game of checkers.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd