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

Ts diagram, how to find points on Ts diagram?

how to find points on Ts diagram?

Engine, #question.what if i poured diesel in petrol engine and petrol in di...

#question.what if i poured diesel in petrol engine and petrol in diesel engine.

Chains of inference, Chains of Inference Now we look at how to get an a...

Chains of Inference Now we look at how to get an agent to verify a given theorem using several search strategies. In previous lectures we have noted that, to specify a search p

Bajaj electronics, HOW WOULD YOU JUDGE THE POTENTIAL PROFIT OF BAJAJ ELECTR...

HOW WOULD YOU JUDGE THE POTENTIAL PROFIT OF BAJAJ ELECTRONICS ON THE FIRST YEAR OF SALES TO BOOTH PLASTICS AND GIVE YOUR VIEWS TO INCREASE THE PROFIT?

Free Vibration Problem, I have a multi-part three mass, three spring and th...

I have a multi-part three mass, three spring and three coordinate system that I need to find: The free vibration of the second mode Magnitude of the steady-state force based on a g

Thrust indication - aircraft engine, Thrust indication: Although rpm ga...

Thrust indication: Although rpm gauges give an indication of the rotational speed of the compressor, they do have one drawback. They do not normally indicate the thrust output

Steamtables, How to draw diagrams for Rankine cycle

How to draw diagrams for Rankine cycle

Corporate Strategy, Corporate Strategy Strategy In our earlier discussion...

Corporate Strategy Strategy In our earlier discussion, we made distinctions between merger and acquisition or takeover. However, they generally involve similar analyses and evalu

Trigonometry( bearings and rectilinear figures), a pilot entering a bay on ...

a pilot entering a bay on course 60.3 degrees at speed 12 miles per hour sees a light bearing 37.3 true and 20 minutes later he sees it bearing 20.0 degrees true. if he keeps the

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