It is the thermodynamic cycle most commonly found in automobile engines. The cycle is closed by the exhaust (letter D and colored blue) stroke, characterized by isochoric cooling and isobaric compression processes.Īn Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. Through the combustion of fuel, heat is added in a constant volume ( isochoric process) process, followed by an adiabatic expansion process power (letter C and colored red) stroke. The idealized diagrams of a four-stroke Otto cycle Both diagrams: the intake ( A and colored green) stroke is performed by an isobaric expansion, followed by an adiabatic compression ( B and colored orange) stroke. Otto cycle pressure–volume diagram Temperature-Entropy diagram
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