Diesel Cycle

Diesel Cycle

The Diesel cycle is an ideal air standard cycle which consists of four processes:

• 1 to 2: Isentropic compression
• 2 to 3: Reversible constant pressure heating
• 3 to 4: Isentropic expansion
• 4 to 1: Reversible constant volume cooling

By defining the compression ratio, r, as:

and cut-off ratio, , as:

The thermal efficiency of an Diesel cycle with a perfect gas as working fluid is:

where,
n=  = a constant depending on specific heat capacity