Otto cycle

In the Otto cycle, then working substance (the one which undergoes thermodynamic processes) undergoes adiabatic compression and expansion, and isochoric heat input and output. This can be seen on a p-V graph:

scan0001

As we saw in adiabatic processes:

scan0002 and scan0003

We can use this, and the compression ratio, r:

scan0005

to calculate the efficiency of the Otto cycle:

scan0004

Back to Contents: Physics: Thermodynamics

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