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7/25/2019 Engines JetStream 31
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EnginesEngines
andand
PropellerPropeller
Turbine
Engine
PanAm International Flight Academy, Inc. 2001
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Garrett TPE-331
dash 10 for the 3100
dash 12 for the 3200
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Single shaft comprising
2 centrifugal compressors
reverse annular urn
! stage a"ial turines
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#eduction $ear
converts engine #P% to Prop #P%
drives accessory section
starter
oil pumps
hydraulic pumps
fuel pumps
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&onstant Speed Prop
pitch of lades
varies to provide
thrust
#P% remainsconstant
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Engine is high RPM with low Torque (41,30 RPM!
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gear"o# $on%erts this to
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Pro&eller with low RPM and 'igh Torque (1,)1 RPM!
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engine &uts out a"out 4000 'P
redu$tion gears $onsu*e a"out 3000 'Plea%ing a"out 1000 'P for the Pro&
)40 'P for the 3100
1020 'P for the 3200
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%easurements
'or(ue
primary instrument for setting po)er
*$'
temperature is the enemy, so )e monitor
#P%measured at gearo", so oth engine and
propeller #P%
dual gauge for precision
primary instrument for determining ifengine running or not
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Sections
Air Flo)
&ompressed
&ompressed again
')o 1+0s and
ignited
Another 1+0 turn
*nergy turns the turines
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Airflo) station numersStation 1 - amient
Station 2 - inlet pressure and temperature
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P2 &ro"e - &ressure at station 2
so*eti*es a P2+T2 &ro"e - &ressure and te*&erature
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Station !
&ompressor outlet
Point of highest pressure- tap off air for air conditioning, anti-ice etc.
P! air
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Station - 'urine Inlet
&ritical temperature areaPoint of highest speed and energy
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*ngine 'emperature %easurement
'I' - measured at the 'urine Inlet
I'' - measured et)een 'urine stages
*$' - measured at the *"haust pipe
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Station / - *"haust area
*"haust $as 'emp area
some engines also measure pressure at
this point and compare to P2 *P#
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*ngine &ooling
one cooling inlets and outlets
*"haust pipe cooling is a special case
ot *"haust $ases
Fuel 'an3
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Scarf 4o55les
6cup7 in e"haust stream to force air circulation around e"haust
pipe
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ooing u& tail&i&e
.$arf no//les
*$' proes
8viously, scarf no55les introducing cool air have to e do)nstream
from the *$' proes
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8il System
lurication of the gearo"
cooling
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8il #eservoir
engine left side
availale to pilot through
access panel
4ote the 9nfeather Pump
)ill discuss later, ut
note for no) that itta3es oil directly from
the reservoir.
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#eservoir
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Access to oil reservoir
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8il 'emperature
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8il temperature Indication
Same gauge as 8il Pressure
:o)nstream of reservoir, prior to
engine driven pressure pump
8il temperature ;imitations
minimum for ta3e off // tor(ue 110 #P%
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Huestions on the 8I; system
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Huestions on the *ngine