Engineering - Engine Cycles Flashcards Preview

AQA A-Level Physics > Engineering - Engine Cycles > Flashcards

Flashcards in Engineering - Engine Cycles Deck (10)
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1

First step (both)

Inlet valve opens, exhaust valve closes

2

Induction stroke (petrol)

Air/fuel mixture in
Piston down
V increases

3

After induction stroke (both)

Inlet valve closes

4

Compression stroke (both)

Piston up
Adiabatic compression
T increases

5

Ignition step (petrol)

Spark ignites mixture
Q1 in
P increases
T increases

6

Power stroke (petrol)

Increased p so piston down
Adiabatic expansion
P decreases
T decreases
V increases

7

After power stroke (both)

Exhaust valve opens
Most gas leaves
Q2 out
P decreases
T decreases

8

Exhaust stroke (both)

Piston up
Rest of gas expelled
V decreases to initial

9

Power stroke 1 (diesel)

Fuel sprayed in
Fuel ignites
Q1 in
Piston down from fuel burning
Constant p
V increases

10

Power stroke 2 (diesel)

Fuel supply cut off
Adiabatic expansion
Piston down
T decreases
P decreases
V increases