5-1 Principles of Gas Turbine Operation SQ

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Describe the relationship between pressure and velocity in a closed system.

Together they make up total pressure.

To keep total pressure the same, if pressure increases, velocity decreases. Vice versa
How does subsonic airflow react through a convergent opening? A divergent opening?
- Convergent
- Pressure Decreases
- Velocity Increases
- Divergent
- Pressure Increases
- Velocity Decreases
How does supersonic airflow react through a convergent opening? A divergent opening?
- Convergent
- Pressure Increases
- Velocity Decreases
- Divergent
- Pressure Decreases
- Velocity Increases
What happens to the airflow as it passes through a nozzle? A diffuser?
- Nozzle
- Velocity Increases
- Pressure Decreases
- Diffuser
- Velocity Decreases
- Pressure Increases
What are the three sections of a gas generator?
- Compressor
- Burner
- Turbine
How does a gas turbine engine produce thrust?

By rapidly compressing, heating, and accelerating a large quantity (mass) of air and fuel.
What cycle explains the movement of air through a gas generator?

Brayton Cycle
What happens to the velocity of the gases as they pass through the compressor section? The burner section? The turbines?
- Compressor - Remains fairly constant
- Burner - Velocity Increases
- Turbines - Velocity increases
What is gross thrust?

Thrust measured at exhaust at standard day conditions 29.92 and 15° C
What is net thrust?
- Thrust measured under normal flight conditions.
When are gross thrust and net thrust equal?

When aircraft is in a static position (inlet airflow is zero) and at standard day conditions.
What affects the density of the air mass?
- Temperature
- Pressure
- Altitude
What happens to thrust when air density decreases?

Thrust decreases
What happens to thrust when air temperature increases?

Thrust decreases
What happens to thrust when air pressure decreases?

Thrust decreases
What is the relationship between pressure and temperature as altitude increases?
- Pressure decreases
- Temperature decreases (until 36,000) feet
- Thrust will decrease
What is the optimum cruise altitude and why?
- Approximately 36,000 feet
- Temperature remains constant in the isothermal layer
How does airspeed and the ram effect change the amount of thrust produced at subsonic and supersonic airspeeds?
- Airspeed increase without ram effect causes thrust to decrease
- Airspeed increase with ram effect causes thrust to remain relatively constant at subsonic speeds and increased greatly at supersonic speeds.

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dundane

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5-1 Principles of Gas Turbine Operation SQ

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Updated

2016-06-16T14:46:12Z

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