The air standard efficiency of an Otto cycle is given by

where r = Compression ratio and

γ = Ratio of specific heats.

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  1. 1 - rγ-1
  2. 1 + rγ-1

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Concept:

Otto cycle

The air-standard-Otto cycle is the idealized cycle for spark-ignition internal combustion engines.

The Otto cycle 1-2-3-4 consists of the following four processes:

  • Process 1-2: Reversible adiabatic compression of air
  • Process 2-3: Heat addition at constant volume
  • Process 3-4: Reversible adiabatic expansion of air
  • Process 4-1: Heat rejection at constant volume

The thermal efficiency of the Otto Cycle:

Compression ratio: r = v1/v2

The air standard efficiency of an Otto cycle is  

Important Points

The air standard efficiency of a Diesel cycle is 

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