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Aircraft General Knowledge > Gas Turbine Principles > Flashcards

Gas Turbine Principles Flashcards

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1
Q

What is the thrust equation?

A

Thrust = mass air flow x (velocity of exhaust - true air speed) + cross sectional area of exhaust x ( jet static pressure - ambient pressure)

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2
Q

What is the air that goes around the outside of a turbine called.

A

Bypass air

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3
Q

Total thrust = fan thrust + blank thrust

A

Core

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4
Q

Pressure thrust (Pf) can be considered when the exhaust nozzle becomes ‘blanked’

A

Chocked

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5
Q

1 horse power is how much thrust?

A

2.5 pounds

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6
Q

What are the 4 parts of the brayton cycle on a gas turbine?

A

Intake - compression - combustion - exhaust

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7
Q

Whats the difference between the otto cycle and the brayton cycle?

A

Brayton happens all at once, continuously.

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8
Q

Combustion takes place at constant blank, in a gas turbine.

A

Pressure

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9
Q

Where does the highest temperature occur within the gas turbine?

A

Primary zone within the combustion chamber

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10
Q

What is the highest thrust that the engine produces?

A

Static thrust

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11
Q

What is a flat rated engine?

A

limited at temperature below 15 degrees

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12
Q

Bleed air blanks the mass flow and thus reduces thrust.

A

Reduces.

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13
Q

Intake heating systems blank the air density and so blank mass flow

A

Reduce

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14
Q

What is thermal efficiency?

A

Fuel energy to kinetic energy.

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15
Q

What does EPR stand for in a turbine engine!

A

Engine pressure ratio

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16
Q

What is propulsive energy?

A

Kinetic energy translated into propulsive force.

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17
Q

How do the gas parameters change within the stator of a compressor stage? The temperature increases, the…Pressure blanks and the speed blanks

A

Pressure increases and the speed decreases.

18
Q

Which of these statements about an impulse turbine are correct or incorrect?

I. The pressure drops across the nozzle guide vanes
II. The pressure drops across the rotor blades

A

Correct - incorrect

19
Q

In subsonic airflows, the convergent exhaust unit is designed to convert… pressure into blank

A

Speed

20
Q

The maximum temperature in a gas turbine engine is limited by the… temperature at the blank

A

Turbine.

21
Q

Both gas turbine and piston engines use a cycle made up of induction, compression, combustion and exhaust phases. Which of these statements about a gas turbine are correct?

  1. The process in a gas turbine engine is continuous
  2. Theoretically the combustion occurs at constant volume
A

Correct - incorrect

22
Q

Jet engine total efficiency indicates the efficiency at which… blank power is transformed into blank power

A

Chemical to propulsive

23
Q

The bypass ratio:

I. is the ratio of bypass air mass flow to HP compressor mass flow
II. can be determined from the inlet air mass flow and the HP compressor mass flow

A

Both correct

24
Q

One of the advantages of multiple-spool jet engine designs is that…a smaller air starter driving only a single blank can be used.

A

Spool

25
Q

One advantage of having three instead of two spools in some high-bypass turbofan engine is that…fewer variable stator vanes and variable inlet guide vanes are required to prevent blank stall at high/low rotor speeds.

A

Compressor at low

26
Q

To ensure efficient combustion in a gas turbine engine…it must be capable of creating the optimal blank blank blank blank.

A

Mixture of air and fuel

27
Q

The primary reason for a limitation being imposed on the temperature of gas flow in a gas turbine is to…ensure that the maximum acceptable temperature at the blank blank is not exceeded.

A

Turbine blades

28
Q

Compressor stall in a gas turbine engine is due to… an excessively high blank of the rotor blades.

A

an excessively high angle of attack of the rotor blades.

29
Q

Which of these statements is correct with regards to stator vanes within axial flow compressors? Pressure increases/decreases due to the air’s blank energy being converted into pressure energy.

A

Increases kinetic energy

30
Q

IMPULSE:
* Guide Vanes –> Pressure blanks
* Rotor Blades –> Pressure is Constant

REACTION
* Guide Vanes –> Pressure blank
* Rotor Blades –> Pressure Drops

A

IMPULSE:
* Guide Vanes –> Pressure Drops
* Rotor Blades –> Pressure is Constant

REACTION
* Guide Vanes –> Pressure is Constant
* Rotor Blades –> Pressure Drops

31
Q

IMPULSE:
* Guide Vanes –> Pressure Drops
* Rotor Blades –> Pressure blank

REACTION
* Guide Vanes –> Pressure is Constant
* Rotor Blades –> Pressure blank

A

IMPULSE:
* Guide Vanes –> Pressure Drops
* Rotor Blades –> Pressure is Constant

REACTION
* Guide Vanes –> Pressure is Constant
* Rotor Blades –> Pressure Drops

32
Q

What is the purpose of an exhaust nozzle?

A

Exhaust gasses have a higher velocity

33
Q

Which of these statements about an impulse turbine are correct or incorrect?

I. The pressure rises across the nozzle guide vanes
II. The pressure remains constant across the rotor blades

A

Incorrect - correct

34
Q

The bypass air in a turbo fan engine has the effect of a lower specific fuel consumption by causing an overall…increase/decrease in average exhaust gas flow velocity and a higher/lower mass flow.

A

Decrease higher

35
Q

Which of these statements about compressor stall in a gas turbine engine are correct or incorrect?

I. A compressor stall is most likely to occur in a compressor designed for a high pressure ratio operating at high RPM
II. A compressor stall is most likely to occur when the air flow stagnates in the rear stages of the compressor

A

Incorrect - correct

36
Q

The purpose of variable by-pass valves in a high bypass turbofan engine between the LP compressor and the HP compressor (HPC) is to…prevent fan blank and LP compressor stall during engine start and blank rotor speeds.

A

Stall low

37
Q

With regard to a jet aeroplane, specific range is the… blank flown per unit fuel of mass

A

Nautical airmiles

38
Q

What is the main purpose of a diffuser? To reduce the blank of the gas entering the combustion chamber.

A

Velocity

39
Q

The function of a vibrator (trembler mechanism) in gas turbine ignition systems is to provide…

A

Dc to transformer

40
Q

When does a hung start occur?

A

Too low pneumatic

41
Q

When does a hot start occur?

A

Tail wind or early cutout

Aircraft General Knowledge (49 decks)

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