Otto Cycle Pv Diagram. Pv diagram of otto cycle. The operation of the otto cycle on a p v diagram is shown in fig.
P v and t s diagram of otto cycle follow the below derivation in order to calculate the efficiency of the petrol engine by otto cycle. Constant volume isochoric heat addition 3. The work times the rate of the cycle cycles per second cps is equal to the power p produced by the engine.
Compression adiabatic the compression ratio is too high part of the mechanical energy of the piston is transferred to the air by increasing its temperature enough to ignite the injected fuel.
Adiabatic compression 1 2 isochoric heat addition 2 3 adiabatic expansion 3 4 and isochoric heat removal 4 1. Thus for the otto cycle we have v2 v3 v4 v1 cr v1 v3 and pr p3 p1. The otto cycle is a description of what happens to a mass of gas as it is subjected to changes of pressure temperature volume addition of heat and removal of heat. Otto cycle derivation now lets consider the process from 1 2 as adiabatic compression 3 4 as adiabatic expansion.