Theory 🥱 Flashcards
Newton’s third law
For every action there is an equal and opposite reaction
Newton’s second law
Force = mass x acceleration
F = ma
Boyle law
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
Charles law
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
Parts of engine core
Compressor
Combustion chamber/burner
Turbine
Bernoulli theorem
In the streamline flow of an ideal fluid, the sum of the variables is a constant
Meaning of ideal fluid
Not viscous nor compressible
Air below 10,000ft and 250kts is an ideal fluid
What happens to converging subsonic air
Velocity increases
Static pressure, temperature and density decreases
What happens to divergent subsonic air
Velocity decreases
Static pressure, temperature and density increases
What happens to convergent air at supersonic speeds
Velocity decreases
Static pressure, temperature and density all increase
What happens to divergent air at supersonic speeds
Velocity increases
Static pressure, temperature and density all decrease
What is the octane number of AVTUR
15
Two types of fixed turbine turboprop
Direct drive
Compound compressor
How much of the total thrust does a propeller provide
90%
What did George Bayton develop
The constant pressure cycle