Engine cycles (AQA A-Level Physics): Flashcards

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Engine cycles
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Another name for the four-stroke engine cycle

Otto cycle

Induction: piston direction & what enters

Down; air-fuel mixture (petrol engine)

Compression: piston direction & what ignites mixture

Up; spark plug

Expansion (power stroke): what does work

Hot gases push piston down

Diesel induction: what enters cylinder

Only air (no fuel)

Diesel: how fuel ignites without spark plug

High temp from compression ignites injected diesel

Indicator diagram shows what relationship

Pressure-volume (pp-VV) during cycle

Indicated power: calculated from what

Area of main pp-VV loop

Brake power: definition

Actual power output after friction losses

Mechanical efficiency formula

brake powerindicated power\frac{\text{brake power}}{\text{indicated power}}

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