Engineering - Engine Cycles Flashcards
1
Q
First step (both)
A
Inlet valve opens, exhaust valve closes
2
Q
Induction stroke (petrol)
A
Air/fuel mixture in
Piston down
V increases
3
Q
After induction stroke (both)
A
Inlet valve closes
4
Q
Compression stroke (both)
A
Piston up
Adiabatic compression
T increases
5
Q
Ignition step (petrol)
A
Spark ignites mixture
Q1 in
P increases
T increases
6
Q
Power stroke (petrol)
A
Increased p so piston down Adiabatic expansion P decreases T decreases V increases
7
Q
After power stroke (both)
A
Exhaust valve opens Most gas leaves Q2 out P decreases T decreases
8
Q
Exhaust stroke (both)
A
Piston up
Rest of gas expelled
V decreases to initial
9
Q
Power stroke 1 (diesel)
A
Fuel sprayed in Fuel ignites Q1 in Piston down from fuel burning Constant p V increases
10
Q
Power stroke 2 (diesel)
A
Fuel supply cut off Adiabatic expansion Piston down T decreases P decreases V increases
