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

Magnetic detector plug debris analysis of aircraft , Magnetic Detector Plug...

Magnetic Detector Plug Debris Analysis of aircraft : The magnetic chip detectors (MCDs), are small, permanent magnets installed in the scavenge/return lines of the engine oil s

The integrator, Integrator This circuit performs the calculus operation...

Integrator This circuit performs the calculus operation of integration. An operational amplifier with negative feedback applied via a capacitor (instead of a resistor) will pe

Ts diagram, how to find points on Ts diagram?

how to find points on Ts diagram?

Fresnel''s and fraunhofer''s classes of diffraction, Q. Distinguish between...

Q. Distinguish between Fresnel's and Fraunhofer's classes of diffraction. Show that the relative intensities of successive maxima of Fraunhofer diffraction at single slit are

Financial Econometrics, In this assignment you are asked to demonstrate you...

In this assignment you are asked to demonstrate your understanding of both exploratory and statistical inference techniques described in class to investigate how the currency marke

Class a amplifier operation, Expertsmind.com brings you unique solution in...

Expertsmind.com brings you unique solution in electrical engineering Class A Amplifier Operation Class A amplifiers are biased so that variations in input signal polarit

Defects are likely to result in castings, Q. What kind of defects are likel...

Q. What kind of defects are likely to result in castings due to the following?         (i) Core prints on the core are undersigned.        (ii) Core prints on the core

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