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Reactive Engines
Do Now Questions
22
Aviation
11th Grade
02/28/2012

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Cards

Term
What force results from the gas exiting an exhaust nozzle?
Definition
Thrust
Term
how can a rocket operate in space
Definition
they carry their own fuel and oxygen source
Term
what are the names of the sections of the gas generator?
Definition

1)Compressor

2)Combustor

3)Turbine

Term
what is standard day barometric pressure?
Definition
14.7 PSI or 19.92" of mercury (Hg)
Term
when is the starter disengaged?
Definition
WHEN THE ENGINE HAS REACHED SELF ACCELERATING SPEED
Term
what is the start sequence?
Definition

1) turn on starter

2) turn on ignition

3) add fuel

Term
what is the most important thing to monitor when starting a GTE?
Definition

ITT

EGT

TIT

Term
What does Bernoullis principle state
Definition
the energy of a fluid or gas in motion is constant. velocity increases as pressure decreases
Term
what happens to pressure and velocity in a convergent duct?
Definition
velocity increases and pressure decreases
Term
what is the shape of the inlet duct on a supersonic a/c
Definition
divergent
Term
compression ratio is a function of what in GTE?
Definition
the function of the # of stages
Term
what is a disadvantage of the centrifugal flow compressor?
Definition
a high pressure rise per stage
Term
what is the function fo the diffuser in a centrifugal flow compressor
Definition
to decrease velocity and increase pressure
Term
what are the two types of fuel nozzles?
Definition

suplex- 1 seperate spray pattern

duplex- 2 seperate spray patterns

Term
when does the pressurization valve open in a duplex nozzle?
Definition
when engine is above idle speed
Term
when does the dump valve open in the P&D valve?
Definition
opens w/ engine shutdown and drains fuel
Term
Components of a GTE's ignition system
Definition
2 high tension leads, 2 low tension leads, 2 exciter boxes, 2 igniter plugs
Term
what type of ignition system is usually used on GTE?
Definition
capacitor type
Term
when is a GTE's ignition system turned off?
Definition
when the engine reaches idle speed
Term
what are the functions of the shrouded tip blades?
Definition
they reduce vibration and keeps gas from flowing between blade tips and outer turbine tips
Term
3 types of turbine blades
Definition

impulse

impulse reaction

reaction

Term
where is the highest heat to metal contact in a GTE?
Definition
first stage nozzle guide vanes
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