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Highest pressure point in a turbine engine?
Diffuser
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What is 1 function of the nozzle diaphragm in a turbine?
- - to raise velocity
- - to direct airflow
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What is a profile of a compressor blade?
A cut out to reduce tip thickness
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In a dual spool compressor, the forward spool is also known as?
- - LPC - low pressure compressor
- - N1
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PT7 stands for?
Total pressure station 7
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When blending blades, how do you file them?
Parallel to the grain structure
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What engine section mixes the fuel and air?
Combustion section
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Combustion occurs at what pressure?
Constant pressure
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At high engine speeds, thrust will increase rapidly with?
Small changes in RPM
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For a dual spool compressor at high altitudes, compressor speed will increase when?
load decreases
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What are the 3 ways to identify the diffuser?
- -diffuser
- -outlet of compressor
- -inlet of combustor
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what are the 2 functions of a stator?
- -to raise pressure
- -to direct airflow
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What is the main function of the turbine?
to drive the compressor
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In a dual spool engine, the first stage turbine drives which compressor?
N2 compressor
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What are the 2 basic elements of the compressor section?
stator and rotor
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What are the 2 elements in a centrifugal compressor?
impeller and diffuser
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If there are vanes on both sides of an impeller it is?
a dual entry
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Some manufacturers identify turbine discharge pressure as?
PT7
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What makes up the hot section?
combustion, trubine, exhaust
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What makes up the cold section?
inlet, compressor, diffuser
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What is needed to weld and straighten turbine blades?
special equipment
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Is welding and straightening turbine blades recommended?
No, it's better to replace them
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What can you NOT mark on a turbine section with?
pencils,wax,or grease
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What is the advantage of axial flow compressors?
higher compression ratio for each stage added
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What are 3 types of turbine blades?
Impulse, Reaction, & Combination (Impulse Reaction)
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A propeller has what affect on air?
It has a small acceleration to a large mass of air
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A turbine has what affect on air?
It has a high acceleration to a small mass of air
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Axial flow compressors equal?
high peak efficiency
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What is the purpose of the diffuser?
increase pressure and decrease velocity
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Where do stress ruptures usually happen on a turbine blade?
leading and trailing edge (90 degrees to the grain)
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Why are turbine blades more susceptible to damage than compressor blades?
because of the heat
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What is the limiting factor of a turbine engine?
TIT (Turbine Inlet Temperature)
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How do you reduce vibration and improve airflow in a turbine?
use shrouded blades to prevent tip losses
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Which engine compressor offers the greatest advantage for starting and performance?
split spool axial flow
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If you remove a blade for inspection, how must it be reinstalled?
in the same position it was removed from
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What is one advantage of a centrifugal compressor?
high pressure rise per stage
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What are the 2 types of centrifugal compressors?
single entry and dual entry
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What is the name of the stationary blades on the compressor section?
stators
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What is the standard day pressure?
29.92" HG & 14.7 PSI
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What is the standard day temperature?
59 degrees F
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If you have a turbine blade that is overtemped, what kind of failure should be expected?
stress ruptures on blades
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When are hot section inspections usually performed?
on a time or cycle basis
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The purpose of the shroud on a turbine blade?
to reduce vibration
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