15.1 FUNDAMENTALS👌🏼 Flashcards
Explain potential energy and formula
- energy at rest/energy that is stored
- PE = mgh
Explain kinetic energy and formula
- energy in motion
- KE = 1/2 x mass x velocity^2
Newton’s first law
- law of inertia
Newton’s second law
- F=ma
- interplay between force and motion
E.g thrust proportional to mass of airflow through engine x acceleration of air through engine
Newton’s third law
- law of action and reaction
Explain the Brayton cycle
-thermodynamic cycle of gas turbine engine that produces thrust
- has 4 stages (intake, compression, expansion and exhaust)
Explain what occurs at intake (suck)?
- air enters at constant volume.
- Leaves intake at increased pressure and a decrease in volume.
Explain compressor (squeeze) ?
- air received from intake at slightly increased pressure, with slight decrease in volume
- air leaves compressor with increased pressure and decrease in volume
Explain expansion (bang)?
- takes place in combustion chamber
- pressure remain constant, but marked increase in volume
- expanding gases turn turbine which converts velocity energy to mechanical energy.
Explain exhaust (blow) section?
- convergent duct
- converts expanding volume and decreasing pressure of gases to a final high velocity
Along the line from 0-2 what change of state occurs
Isentropic compression
Pressure increases, volume decreases
Process from 2 to 3 what change of state occurs
Isobaric heating
What change of state in lines 3 to 5
Isentropic expansion
What occurs from process 0-5
Isobaric heat release into nozzle
Formula for force
F = ma
What is the formula for work done
W = force x distance