Theory 🥱 Flashcards

1
Q

Newton’s third law

A

For every action there is an equal and opposite reaction

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2
Q

Newton’s second law

A

Force = mass x acceleration
F = ma

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3
Q

Boyle law

A

For a fixed amount of an ideal gas kept at a fixed temperature, Pressure (P) and volume (V) are inversely proportional

PV = k where k is a constant
This means that as pressure increases, temperature decreases and vice versa

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4
Q

Charles law

A

When the pressure on a sample of a dry gas is held constant, the kelvin temperature and volume will be in direct proportion

V/T = K

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5
Q

Parts of engine core

A

Compressor
Combustion chamber/burner
Turbine

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6
Q

Bernoulli theorem

A

In the streamline flow of an ideal fluid, the sum of the variables is a constant

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7
Q

Meaning of ideal fluid

A

Not viscous nor compressible
Air below 10,000ft and 250kts is an ideal fluid

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8
Q

What happens to converging subsonic air

A

Velocity increases
Static pressure, temperature and density decreases

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9
Q

What happens to divergent subsonic air

A

Velocity decreases
Static pressure, temperature and density increases

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10
Q

What happens to convergent air at supersonic speeds

A

Velocity decreases
Static pressure, temperature and density all increase

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11
Q

What happens to divergent air at supersonic speeds

A

Velocity increases
Static pressure, temperature and density all decrease

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12
Q

What is the octane number of AVTUR

A

15

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13
Q

Two types of fixed turbine turboprop

A

Direct drive
Compound compressor

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14
Q

How much of the total thrust does a propeller provide

A

90%

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15
Q

What did George Bayton develop

A

The constant pressure cycle

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16
Q

Characteristics of a fixed direct drive turbine

A

Prop connected via reduction gear box to turbines and the shaft connected to the compressor
Prop driven directly from the spool
Fine pitch setting required on the ground

17
Q

Fixed turbine compound compressor characteristics

A

Two spools
Low pressure spool turns prop gearbox

18
Q

Free turbine characteristics

A

Prop driven by the turbine and independent from the engine meaning engine can be running with prop stationary

19
Q

Types of turbofan engines

A

Conventional and geared

20
Q

Core of turbofans

A

Compressor
Combustion chamber
Turbine

21
Q

How does air pass through a Turbo fan

A

All air enters passed the fan with 90% of this bypassing the core

22
Q

What is a spool

A

Compressor -shaft-turbine combination

23
Q

In turbofans which spool is connected to the fan

A

Low pressure spool (N1)

24
Q

What happens to air velocity in each section of the engine

A

Compressor- stable
Combustion chamber - stable
Turbine-fluctuates
Exhaust -increases

25
Q

What happens to air pressure in each stage of the engine

A

Compressor -rises
Combustion chamber - falls slightly
Turbine- falls
Exhaust - falls slightly

26
Q

What happens to the temperature of air in each stage of the engine

A

Compressor - rises
Combustion chamber - rises
Turbine -falls
Exhaust -falls