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beardpapa
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1. Describe the relationship between pressure and velocity in a closed system.
Together the make up total pressure.
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2. How does subsonic airflow react through a convergent opening? Divergent opening?
- Convergent: V increase and P decreases
- Divergent: Vdecreases and P increases
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3. How does supersonic airflow react through a convergent opening? Divergent opening?
- Divergent: V increases P decreases
- Convergent: V decreases P increases
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4. What happens to the airflow as it passes through a nozzle? Diffuser?
- Nozzle: velocity increases and pressure decreases.
- Diffuser: velocity decreases and pressure increases.
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5. What are the three sections of a gas turbine engine?
Compressor, burner, turbine
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6. How does a gas turbine engine produce thrust?
By rapidly compressing, heating and accelerating a large quantity of air (mass) and fuel
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7. What cycle explains the movement of air through a gas turnbine engine?
Brayton Cycle
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8. What happens to the velocity of the gases as they pass through the compressor section? The burner section? The turbines?
- Compresor: Remains fairly constant.
- Burner and turbine: increases
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9. What is gross thrust?
Thrust measured at exhaust at standard day conditions 29.92 and 15 degress Celsius
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10. What is net thrust?
Thrust measured under normal flight conditions
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11. When are gross thrust and net thrust equal?
When aircraft is in a static position and standard day conditions.
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12. What affects the density of the air mass?
Temperature, pressure, and altitude.
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13. What happens to thrust when air density decreases?
Thrust decreases
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14. What happens to thrust when air temperature increases?
Thrust decreases
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15. What happens to thrust when air pressure decreases?
Thrust decreases.
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16. What is the relationship between pressure and temperature as altitude increases?
Temperature and pressure both decrease with an overall decrease in thrust.
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17. What is the optimum cruise altitude and why?
Approximately 36,000 ft. temperature remains isothermal.
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18. 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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