3. Fluid characteristics and energies involved in theoretical cycles

As the Beau de Rochas and Diesel cycles can be considered as special cases of the combined cycle, the calculations are based on this cycle (figure 8 ).

First, we need to define the parameters involved in these calculations:

• strokeC corresponds to the length of piston travel ;

• the bore of a cylinder is its diameter D ;

• Displacement is the volume displaced by one forward or return stroke of the piston: $V_c={\displaystyle \text{π}}\frac{D^2}{4}C=V_1-V_2$

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