Fuel Air and Actual Cycles and their Analysis topics include: Fuel air cycle, dissociation, actual cycle, air cycle and fuel cycles, effect of operating variables. A fuel-air cycle analysis considers the effects of variations in fuel-air ratio, inlet pressure and temperature on engine performance. The fuel-air cycle is a theoretical cycle that considers the actual properties of the cylinder contents. The analysis makes the following assumptions: There are no chemical changes in either fuel or air before combustion After combustion, the charge is always in chemical equilibrium All... Show more

Fuel Air and Actual Cycles and their Analysis topics include: Fuel air cycle, dissociation, actual cycle, air cycle and fuel cycles, effect of operating variables.

A fuel-air cycle analysis considers the effects of variations in fuel-air ratio, inlet pressure and temperature on engine performance. The fuel-air cycle is a theoretical cycle that considers the actual properties of the cylinder contents.

The analysis makes the following assumptions:
There are no chemical changes in either fuel or air before combustion
After combustion, the charge is always in chemical equilibrium
All processes are adiabatic
Compression and expansion processes are frictionless
Velocities are negligibly small
Combustion takes place instantaneously at top dead center
The fuel is well mixed with air 

The main difference between air-standard cycles and fuel-air cycles is the process of adding heat to the cycle. In air-standard cycles, heat is added from an external source. In fuel-air cycles, the added heat is generated internally from the chemical reaction (combustion). 

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