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Реферат Working out of the search algorithm of failures of Air Conditioning System of TU-154

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Текст реферата Working out of the search algorithm of failures of Air Conditioning System of TU-154

Ministry of education and science of Ukraine
National Aviation University
Course work
on the discipline
Diagnostics of aircraft state
‘ Working out of the search algorithm of failures of Air
Conditioning System of TU-154’
the work is performed by
the student of 505 FLA
D . Zhuravel
the work is checked by :
Y . A . Sapeljuk
Kyiv 2009
1 . Work’ s goal
2 . Description of ACS of Tu-154
3 . Principal scheme of ACS of Tu-154
4 . Theoretical base of algorithm developing process
5 . Description of obtained algorithm
Description and operating principles of Air-Conditioning System of
The air conditioning system ( ACS ) provides pressurization,
ventilation, heating of the pressure cabin . Air is taken from the 9th
compressor stage of three engines in amount of 5000-5500 kg/h,
temperature is between 240 350 °C and differential pressure is 7 ,5
9kg/sm2 .
The ACS supply conditioned air to the control cabin, passenger cabin,
electronic equipment compartment, forward cargo compartment, air
conditioning distribution bay and aft cargo compartment, and provides
constant pressure and temperature in pressure cabin . It is maintained
by air flow regulation . Air supply to the air conditioning system is
furnished by the pneumatic system from either engine bleed air or the
auxiliary power unit ( APU ) in flight ; from engine bleed air, APU
bleed air, ground pneumatic supply cart, or from a ground conditioned
air supply cart during ground operation . All cold air required for
air conditioning is provided by air conditioning packs . Passing bleed
air through a primary heat exchanger, an air cycle machine, and a
secondary heat exchanger cools the air sufficiently to handle any
cooling situation required . A ram air system provides coolant air for
the heat exchangers .
In each of three pipelines there is regulated check valve to prevent
air masses flow in returned direction . Pipelines attachment is
realized with the help of compensators .
Further three pipelines are connected into single one mainline, which
leads to the first cooling stage preliminary airtoair heat exchanger .
Temperature of hot air after AAHE is ranged between 100 200°C . AAHE
is the first stage of cabin air cooling maintained by atmosphere
ramair flow . AAHE is oneflow .
In case of overcooling there is bypass line to bleed off air besides
AAHE . Before air enters pressure cabin the main line is divided on
two parallel pipelines : right and left .
They lead to two main cooling stages, where AAHEs and air cycle
machines installed . Here, after AAHE air temperature should be not
more than 60°C, behind ACM 10 20°C . In case of overcooling there are
two bypass lines besides AAHE and ACM . Bypass of air is carried by
air distributers mounted on AAHE . Regulation of distributers is
automatic or manual .
ACM has two functions : to cool air flowing from AAHE being secondary
stage of air cooling ; to suck scavenged air through AAHE during ACS